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Hydrogen-Induced Ultralow Optical Absorption and Mechanical Loss in Amorphous Silicon for Gravitational-Wave Detectors, M. Molina-Ruiz, A. Markosyan, R. Bassiri, M.M. Fejer, M. Abernathy, T.H. Metcalf, X. Liu, G. Vajente, A. Ananyeva, and F. Hellman,Phys. Rev. Lett. 131 256902 (2023).
Observation of spin-momentum locked surface states in amorphous Bi2Se3, P. Corbae, S. Ciocys, D. Varjas, E. Kennedy, S. Zeltmann, M. Molina-Ruiz, S. M. Griffin, C. Jozwiak, Z. Chen, L.-W. Wang, A. M. Minor, M. Scott, A. G. Grushin, A. Lanzara, and F. Hellman, Nat. Mater. 22 200-206 (2023).
Characterizing Temporal Heterogeneity by Quantifying Nanoscale Fluctuations in Amorphous Fe-Ge Magnetic Films, A. Singh, E. Hollingworth, S. A. Morley, X. M. Chen, A. Us Saleheen, R. Tumbleson, M. R. McCarter, P. Fischer, F. Hellman, S. D. Kevan, and S. Roy, Adv. Funct. Mater. 33 2300224 (2023).
Chiral Spin Textures in Amorphous Iron–Germanium Thick Films, R. Streubel, D. S. Bouma, F. Bruni, X. Chen, P. Ercius, J. Ciston, A. T. N’Diaye, S. Roy, S. D. Kevan, P. Fischer, and F. Hellman, Adv. Mater. 33 2004830 (2021).
Role of element-specific damping on the ultrafast, helicity-independent all-optical switching dynamics in amorphous (Gd,Tb)Co thin films, A. Ceballos, A. Pattabi, A. El-Ghazaly, S. Ruta, C. P. Simon, R. F. L. Evans, T. Ostler, R. W. Chantrell, E. Kennedy, M. Scott, J. Bokor, and F. Hellman, Phys. Rev. B 103 024438 (2021).
Origin of mechanical and dielectric losses from two-level systems in amorphous silicon, M. Molina-Ruiz, Y. J. Rosen, H. C. Jacks, M. R. Abernathy, T. H. Metcalf, X. Liu, J. L DuBois and F. Hellman, Phys. Rev. Materials 5, 035601 (2021).
Internal friction measurements of low energy excitations in amorphous germanium thin films, T. H. Metcalf, X. Liu, G. Jernigan, J. C. Culbertson, M. Abernathy, M. Molina-Ruiz, and F. Hellman, J. Alloys Compd. 856 157616 (2021).
Open data from the first and second observing runs of Advanced LIGO and Advanced Virgo, R. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), SoftwareX 13, 100658 (2021).
Comparing amorphous silicon prepared by electron-beam evaporation and sputtering toward eliminating atomic tunneling states, X. Liu, M. R. Abernathy, T. H. Metcalf, B. Jugdersuren, J. C. Culbertson, M. Molina-Ruiz, and F. Hellman, J. Alloys Compd. 855 157431 (2021).
Gravitational-wave Constraints on the Equatorial Ellipticity of Millisecond Pulsars, R. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), ApJL 902 L21 (2020).
Two-level systems and growth-induced metastability in hydrogenated amorphous silicon, M. Molina-Ruiz, H. C. Jacks, D. R. Queen, Q. Wang, R. S. Crandall and F. Hellman, Mater. Res. Express 7 095201 (2020).
Tilted fluctuation electron microscopy, Ellis Kennedy, Neal Reynolds, Luis Rangel DaCosta, Frances Hellman, Colin Ophus, and M. C. Scott, Appl. Phys. Lett. 117, 091903 (2020).
A cryogenic silicon interferometer for gravitational-wave detection, R. X. Adhikari, F. Hellman, M. Molina-Ruiz et al., Class. Quantum Grav. 37 165003 (2020).
Properties and Astrophysical Implications of the 150 M⊙ Binary Black Hole Merger GW190521, R. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), ApJL 900 L13 (2020).
GW190521: A Binary Black Hole Merger with a Total Mass of 150 M⊙, R. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), Phys. Rev. Lett. 125, 101102 (2020).
GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass Black Hole with a 2.6 Solar Mass Compact Object, R. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), ApJL 896 L44 (2020).
GW190412: Observation of a binary-black-hole coalescence with asymmetric masses, R. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), Phys. Rev. D 102, 043015 (2020).
A Joint Fermi-GBM and LIGO/Virgo Analysis of Compact Binary Mergers from the First and Second Gravitational-wave Observing Runs, R. Hamburg, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (Fermi-GBM instrument team, LIGO Scientific Collaboration and Virgo Collaboration), ApJ 893 100 (2020).
Optically targeted search for gravitational waves emitted by core-collapse supernovae during the first and second observing runs of advanced LIGO and advanced Virgo, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration, ASAS-SN Collaboration, DLT40 Collaboration), Phys. Rev. D 101, 084002 (2020).
GW190425: Observation of a Compact Binary Coalescence with Total Mass ~ 3.4 M⊙, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), ApJL 892 L3 (2020).
Model comparison from LIGO–Virgo data on GW170817's binary components and consequences for the merger remnant, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), Class. Quantum Grav. 37 045006 (2020).
Itinerant ferromagnetism and intrinsic anomalous Hall effect in amorphous iron-germanium, D. S. Bouma, Z. Chen, B. Zhang, F. Bruni, M. E. Flatté, A. Ceballos, R. Streubel, L.-W. Wang, R. Q. Wu, and F. Hellman, Phys. Rev. B 101, 014402 (2020).
Search for Gravitational-wave Signals Associated with Gamma-Ray Bursts during the Second Observing Run of Advanced LIGO and Advanced Virgo, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), ApJ 886 75 (2019).
Search for Subsolar Mass Ultracompact Binaries in Advanced LIGO’s Second Observing Run, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), Phys. Rev. Lett. 123, 161102 (2019).
Search for Eccentric Binary Black Hole Mergers with Advanced LIGO and Advanced Virgo during Their First and Second Observing Runs, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), ApJ 883 149 (2019).
Search for intermediate mass black hole binaries in the first and second observing runs of the Advanced LIGO and Virgo network, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), Phys. Rev. D 100, 064064 (2019).
Reconfigurable ferromagnetic liquid droplets, Xubo Liu, Noah Kent, Alejandro Ceballos, Robert Streubel, Yufeng Jiang, Yu Chai, Paul Y. Kim, Joe Forth, Frances Hellman, Shaowei Shi, Dong Wang, Brett A. Helms, Paul D. Ashby, Peter Fischer, Thomas P. Russell, Appl. Phys. Lett. 114, 232407 (2019).
Ultrafast magnetization switching in nanoscale magnetic dots, Amal El-Ghazaly, Brandon Tran, Alejandro Ceballos, Charles-Henri Lambert, Akshay Pattabi, Sayeef Salahuddin, Frances Hellman, and Jeffrey Bokor, Appl. Phys. Lett. 114, 232407 (2019).
All-sky search for short gravitational-wave bursts in the second Advanced LIGO and Advanced Virgo run, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), Phys. Rev. D 100, 024017 (2019).
All-sky search for long-duration gravitational-wave transients in the second Advanced LIGO observing run, B. P. Abbott, F. Hellman, M. Molina-Ruiz, K. Shukla et al. (LIGO Scientific Collaboration and Virgo Collaboration), Phys. Rev. D 99, 104033 (2019).
Effect of strain and thickness on the transition temperature of epitaxial FeRh thin-films, A. Ceballos, Zhanghui Chen, O. Schneider, C. Bordel, Lin-Wang Wang, and F. Hellman, Appl. Phys. Lett. 111, 172401 (2017).
Interface-Induced Phenomena in Magnetism, F. Hellman et al., Rev. Mod. Phys. 89, 025006 (2017).
Ultrathin IBAD MgO films for epitaxial growth on amorphous substrates and sub-50 nm membranes, Siming Wang, C. Antonakos, C. Bordel, D. S. Bouma, P. Fischer, and F. Hellman, Appl. Phys. Lett. 109, 191603 (2016) download
Scaling of the anomalous Hall effect in lower conductivity regimes, J. Karel, C. Bordel, D.S. Bouma, A. De Lorimier-Farmer, H.J. Lee and F. Hellman, EPL, 114 (2016) 57004 download
Spin-Orbit Torques in ferrimagnetic GdFeCo Alloys, N. Roschewsky, T. Matsumura, S. Cheema, F. Hellman, T. Kato, S. Iwata, S. Salahuddin, Appl. Phys. Lett. 109, 112403 (2016) download
Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films, M. Charilaou, C. Bordel, P.E. Berche, B.B. Maranville, P. Fischer and F. Hellman, Phys. Rev. B 93, 224408 (2016)
Effect of chemical order on the magnetic and electronic properties of epitaxial off-stoichiometry FexSi1-x thin films, J. Karel, J. Juraszek, J. Minar, C. Bordel, K.H. Stone, Y.N. Zhang, J. Hu, R.Q. Wu, H. Ebert, J.B. Kortright and F. Hellman, Phys. Rev. B 91, 144402 (2015)
Two-level systems in evaporated amorphous silicon, D.R. Queen, X. Liu, J. Karel, H.C. Jacks, T.H. Metcalf and F. Hellman, Journal of Non-Crystalline Solids 426 (2015) 19-24
Amorphous Dielectric Thin Films with Extremely Low Mechanical Loss, X. Liu, D.R. Queen, T.H. Metcalf, J.E. Karel and F. Hellman, Archives of Metallurgy and Materials, Volume 60, Issue 1, Pages 359-363, ISSN (Online) 2300-1909 (2015)
Light-induced metastability in pure and hydrogenated amorphous silicon, D.R. Queen, X. Liu, J. Karel, Q. Wang, R.S. Crandall, T.H. Metcalf and F. Hellman, EPL, 112 (2015) 26001
Temperature-driven growth of antiferromagnetic domains in thin-film FeRh, C. Baldasseroni, C. Bordel, C. Antonakos, A. Scholl, K. H. Stone, J.B. Kortright and F. Hellman, J. Phys.: Condens. Matter 27, 256001 (2015)
Roughness effects in uncompensated antiferromagnets, M. Charilaou and F. Hellman, J. Appl. Phys. 117, 083907 (2015)
Surface-induced phenomena in uncompensated collinear antiferromagnets, M. Charilaou and F. Hellman, J. Phys.: Condens. Matter 27 (2015) 086001
Hydrogen-free amorphous silicon with no tunneling states, X. Liu, Daniel R. Queen, Thomas H. Metcalf, Julie E. Karel and F. Hellman, PRL, 113, 025503 (2014)
Anomalous magnetic thermodynamics in uncompensated collinear antiferromagnets, M. Charilaou and F. Hellman, EPL, 107 (2014) 27002
Magnetization switching and inverted hysteresis in perpendicular antiferromagnetic superlattices, M. Charilaou, C. Bordel, F. Hellman, Appl. Phys. Lett. 104, 212405 (2014)
Using structural disorder to enhance the magnetism and spin-polarization in FexSi1-x thin films for spintronics, J. Karel, Y. N. Zhang, C. Bordel, K. H. Stone, T. Y. Chen, C. A. Jenkins, David J. Smith, J Hu, R. Q. Wu, S. M. Heald, J. B. Kortright and F. Hellman, Materials Research Express 1, 026102 (2014)
Effect of capping material on interfacial ferromagnetism in FeRh thin films, C. Baldasseroni, G. K. Palsson, C. Bordel, S. Valencia, A. A. Unal, F. Kronast, S. Nemsak, C. S. Fadley, J. A. Borchers, B. B. Maranville, and F. Hellman, J. Appl. Phys. 115, 043919 (2014)
Mean-field simulation of metal oxide antiferromagnetic films and multilayers, M. Charilaou and F. Hellman, Phys. Rev. B 87, 184433 (2013)
Excess Specific Heat in Evaporated Amorphous Silicon, D. R. Queen, X. Liu, J. Karel, T. H. Metcalf, and F. Hellman, Phys. Rev. Lett. 110, 135901 (2013)
Electron-Mediated Ferromagnetic Behavior in CoO/ZnO Multilayers, H.-J. Lee, C. Bordel, J. Karel, David W. Cooke, M. Charilaou, and F. Hellman, Phys. Rev. Lett. 110, 087206 (2013)
Cr(110) texture induced by epitaxy on Al2O3(0001) substrates: Preferential grain growth in the <001> direction, Z. Boekelheide and F. Hellman, Appl. Phys. Lett. 102, 141601 (2013)
Temperature-driven nucleation of ferromagnetic domains in FeRh thin films, C. Baldasseroni, C. Bordel, A. X. Gray, A. M. Kaiser, F. Kronast,J. Herrero-Albillos, C. M. Schneider, C. S. Fadley and F. Hellman, Appl. Phys. Lett. 100, 262401 (2012)
Thermodynamic Measurements of Fe-Rh Alloys, David W. Cooke, F. Hellman, C. Baldasseroni, C. Bordel, S. Moyerman, and E. E. Fullerton, Phys. Rev. Lett. 109, 255901 (2012)
Towards analysis of the electron density of states of Nb3Sn as a function of strain, M. G. T. Mentink, M. M. J. Dhalle, D. R. Dietderich, A. Godeke, W. Goldacker, F. Hellman,and H. H. J. ten Kate, AIP Conf. Proc. 1435, 225 (2012)
Fe Spin Reorientation across the Metamagnetic Transition in Strained FeRh Thin Films, C. Bordel, J. Juraszek, David W. Cooke, C. Baldasseroni, S. Mankovsky, J. Minár, H. Ebert, S. Moyerman, E. E. Fullerton, and F. Hellman, Phys. Rev. Lett. 109, 117201 (2012)
Effect of gadolinium adatoms on the transport properties of graphene, M. Alemani, A. Barfuss, B. Geng, C. Girit, P. Reisenauer, M. F. Crommie, F. Wang, A. Zettl, and F. Hellman, Phys. Rev. B 85, 094413 (2012)
Electronic Structure Changes across the Metamagnetic Transition in FeRh via Hard X-Ray Photoemission, A. X. Gray, D. W. Cooke, P. Krüger, C. Bordel, A. M. Kaiser, S. Moyerman, E. E. Fullerton, S. Ueda, Y. Yamashita, A. Gloskovskii, C. M. Schneider, W. Drube, K. Kobayashi, F. Hellman, and C. S. Fadley, Phys. Rev. Lett. 108, 257208 (2012)
Chemical ordering in Cr3Al and relation to semiconducting behavior, Z. Boekelheide, D. A. Stewart, and F. Hellman, Phys. Rev. B 86, 085120 (2012)
Antiferromagnetism in Cr3Al and relation to semiconducting behavior, Z. Boekelheide, T. Saerbeck, Anton P. J. Stampfl, R. A. Robinson, D. A. Stewart, and F. Hellman, Phys. Rev. B 85, 094413 (2012)
Heat transfer simulation and thermal measurements of microfabricated x-ray transparent heater stages, C. Baldasseroni, D. R. Queen, David W. Cooke, K. Maize, A. Shakouri, and F. Hellman, Rev. Sci. Instrum. 82, 093904 (2011)
Hard x-ray photoemission study of near-Heusler FexSi1-x alloys, A. X. Gray, J. Karel, J. Minar, C. Bordel, H. Ebert, J. Braun, S. Ueda, Y. Yamashita, L. Ouyang, D. J. Smith, K. Kobayashi, F. Hellman, and C. S. Fadley, Phys. Rev. B, 83, 195112, (2011)
Calorimetry of epitaxial thin films, David W. Cooke, F. Hellman, J. R. Groves, B. M. Clemens, S. Moyerman, and E. E. Fullerton, Rev. Sci. Instrum. (2011)
Band gap and electronic structure of an epitaxial, semiconducting Cr0.80Al0.20 thin film, DZ. Boekelheide, A. X. Gray, C. Papp, B. Balke, D. A. Stewart, S. Ueda, K. Kobayashi, F. Hellman, and C. S. Fadley, Phys. Rev. Lett. 105, 236404, (2010)
Effect of magnetic Gd adatoms on the transport properties of ultrathin gold films, M. Alemani, A. Huegel, E. Helgren, D. R. Queen, and F. Hellman, Phys. Rev. B 82, 195447, (2010)
Distinct local electronic structure and magnetism for Mn in amorphous Si and Ge, Li Zeng, J. X. Cao, E. Helgren, J. Karel, E. Arenholz, Lu Ouyang, David J. Smith, R. Q. Wu, and F. Hellman, Phys. Rev. B 82, 165202, (2010)
Evidence for nanoscale two-dimensional Co clusters in CoPt3 films with perpendicular magnetic anisotropy, J. O. Cross, M Newville, B B Maranville, C Bordel, F Hellman and V G Harris, J. Phys.: Condens. Matter 22, 146002, (2010)
Resonant impurity scattering and electron-phonon scattering in the electrical resistivity of Cr thin films, Z. Boekelheide, David W. Cooke, E. Helgren, and F. Hellman, Phys. Rev. B 80, 134426, (2009)
Electronic and vibrational density of states through the metal-insulator transition in amorphous yttrium-silicon alloy thin films, B.L. Zink and F. Hellman, Phys. Rev. B 79, 235105, (2009)
Tracking spin-glass barriers versus field and temperature in a-Gd0.19Si0.81, V. Orlyanchik, M.B. Weissman, E. Helgren, L. Zeng, and F. Hellman, Phys. Rev. B 79, 224402 (2009)
Gate-controlled magnetic properties of the magnetic semiconductor (Zn,Co)O, H.-J. Lee, E. Helgren, and F. Hellman, Applied Physics Letters 94, 212106 (2009)
Thin film nanocalorimeter for heat capacity measurements of 30 nm films, D.R. Queen and F. Hellman, Review of Scientific Instruments 80, 063901 (2009): selected for the June 15, 2009 issue of Virtual Journal of Nanoscale Science & Technology.
The role of the spin-density wave and disorder in the density of states of sputtered Cr films, David W.Cooke, Z. Boelkelheide, D.R. Queen, and F. Hellman, J. Appl. Phys. 105, 07C314 (2009)
Thermodynamic measurements of submilligram bulk samples using a membrane-based 'calorimeter on a chip', D.W. Cooke, K.J. Michel, and F. Hellman, Review of Scientific Instruments 79, 053902 (2008)
X-ray adsorption study of the electronic structure of Mn-doped amorphous Si, Li Zeng, A. Huegel, E. Helgren, F. Hellman, C. Piamonteze, and E. Arenholz, Appl. Phys. Lett. 92, 142503 (2008)
Quenched magnetic moment in Mn-doped amorphous Si films, Li Zeng, E. Helgren, M. Rahimi, F. Hellman, R. Islam, B.J. Wilkens, R.J. Culbertson and D. Smith, Phys. Rev. B 77, 073306 (2008)
Spin-density wave in polycrystalline Cr films from infrared reflectivity, Z. Boekelheide, E. Helgren, F. Hellman, Phys. Rev. B, 76, 224429 (2007)
Magnetic and transport properties of amorphous GdxGe1-x alloys near the metal-insulator transition, E. Helgren, F. Hellman, Li Zeng, N. Sinenian, R. Islam, and David J. Smith, Phys. Rev. B 76, 184440 (2007)
Microstructure, magnetotransport, and magnetic properties of Gd-doped amorphous carbon, Li Zeng, E. Helgren, F. Hellman, R. Islam, D. J. Smith, J. W. Ager, III, Phys. Rev. B, 75, 235450 (2007)
Application of calorimetry on a chip to high-pressure materials, Alexandra Navrotsky, Maria Dorogova, Frances Hellman, David W. Cooke, Barry L. Zink, Charles E. Lesher, Juliana Boerio-Goates, Brian F. Woodfield, Brian Lang, PNAS 104:22, 9187 (2007)
Concentration dependent microstructure and transport properties of the magnetic semiconductor Gd-Si, Helgren, D. R. Queen, F. Hellman, L. Zeng, R. Islam, David J. Smith, J. Appl. Phys., 101, 093712 (2007)
Growth and microstructure dependence of electronic and magnetic properties in magnetically doped Gd-Si amorphous semiconductors, L. Zeng, E. Helgren, R. Islam, David J. Smith, F. Hellman, Phys. Rev. B, 75, 184404 (2007)
Effects of annealing on amorphous GdxSi1-x near the metal-insulator transition, E. Guillotel, L. Zeng, E. Helgren, F. Hellman, R. Islam, David J. Smith, J. Appl. Phys., 101, 023908 (2007)
Excess modes and enhanced scattering in rare-earth-doped amorphous silicon thin films, B. L. Zink, R. Islam, David J. Smith, F. Hellman, Phys. Rev. B 74, 205209 (2006)
Thermal conductivity and specific heat of thin-film amorphous silicon, B. L. Zink, R. Pietri, and F. Hellman, Phys. Rev. Lett., 96, 055902 (2006)
Simulation of clustering and anisotropy due to Co step-edge segregation in vapor deposited CoPt3, B. B. Maranville, M. Schuerman, and F. Hellman, Phys. Rev. B, 73, 104435 (2006)
Field- and concentration-tuned scaling of a quantum phase transition in a magnetically doped semiconductor, E. Helgren, L. Zeng, K. Burch, D. Basov, and F. Hellman, Phys. Rev. B, 73, 155201 (2006)
Magnetic rare earth (Gd) implanted tetrahedral amorphous carbon (ta-C), L. Zeng, E. Helgren, H. Zutz, C. Ronning, F. Hellman, Mater. Res. Soc. Symp. Proc. 941, Q08-22 (2006)
Prototype of a radiation hard resistive bolometer for ITER, L. Giannone, D. R. Queen, F. Hellman, and J. C. Fuchs, Plasma Phys. Control. Fusion 47, 2123-2143 (2005)
Beneficial effects of annealing on amorphous Nb-Si thin film thermometers, D. Querlioz, E. Helgren, D. R. Queen, F. Hellman, R. Islam, David J. Smith, Appl. Phys. Lett. 87, 221901 (2005)
Si-N membrane-based microcalorimetry: Heat capacity and thermal conductivity of thin films, B. Revaz, B.L. Zink and F. Hellman, Thermochimica Acta 432 (2005) 158¨C168
Measurement of Thermal Conductivity of Thin Films with a Micromachined Membrane Calorimeter, B. L. Zink, B. Revaz, J. J. Cherry, and F. Hellman, Rev. Sci. Instr. 76, 24901-5 (2005)
Characteristic temperature in magnetically-doped amorphous semiconductors, E. Helgren, J. Cherry, L. Zeng, F. Hellman, Phys. Rev. B 71, 113203 (2005)
Interplay between charge localization and magnetic ordering in amorphous GdxSi1-x, N. K. Chumakov, S. V. Gudenko, V. V. Tugushev, A. B. Davydov, V. I. Ozhogin, E. Helgren, and F. Hellman, J. Magn. Magn. Mat., 272-276, 1351-2 (2004)
Variation of the density of states in amorphous GdSi at the metal-insulator transition, L. Bokacheva, W. Teizer, F. Hellman, and R. C. Dynes, Phys. Rev. B 69, 235111 (2004)
Specific Heat and Thermal Conductivity of Low-Stress Amorphous Si-N Membranes, B. L. Zink and F. Hellman, Sol. St. Comm. 129, (2004)
AFM Excitations in the Specific Heat of La2CuO4.11 Single Crystals, G. A. Jorge, M. Jaime, L. Civale, C. Batista, B. L. Zink, F. Hellman, B. Khaykovich, M. A. Kastner, Y. S. Lee, and R. J. Birgeneau, Phys Rev B 69, 174506 (2004)
Numerical Simulation of the Heat Transfer in a-Si-N-Membrane Based Microcalorimeters, B. Revaz, D. O'Neil, L. Hull, and F. Hellman, Rev. Sci. Instr. 74, 4389 (2003)
Spin Polarized Tunneling at the Metal-Insulator Transition, W. Teizer, F. Hellman and R. C. Dynes, Int'l J. of Mod. Physics B, Vol. 0, 1-3, 2003
XAFS Study of Local Disorder in a-GdxSi1-x Amorphous Magnetic Semiconductor, D. Haskel, J. W. Freeland, J. Cross, R. Winarski, M. Newville, and F. Hellman, Phys. Rev. B 67, 115207 (2003)
Mean Field Behavior with Gaussian Fluctuations at the Ferromagnetic Phase Transition of SrRuO3, D. Kim, B. L. Zink, F. Hellman, S. McCall, G. Cao, and J. E. Crow, Phys. Rev. B Rapid Communications 67, 100406 (2003)
Flux Pinning Enhancement in Ferromagnetic and Superconducting Thin Film Multilayer, D.B. Jan, J.Y. Coulter, B.B. Maranville, M.E. Hawley, L.N. Bulaevskii, M.P. Maley, F. Hellman, X.Q. Pan, and Q.X. Jia, Appl. Phys. Lett. 82, 778 (2003)
The Hall Effect at a Tunable Metal-Insulator Transition, W. Teizer, F. Hellman, and R.C. Dynes, Phys. Rev. B Rapid Communications 67, 121102 (2003)
Finite Size Effects on the Moment and Ordering Temperatures in Antiferromagnetic CoO Layers, Y. J. Tang, D. J. Smith, B. L. Zink, F. Hellman, and A. E. Berkowitz, Phys. Rev. B. 67, 054408 (2003)
Magnetic and Transport Properties of Amorphous Tb-Si Alloys Near the Metal-Insulator Transition, M. Liu and F. Hellman, Phys. Rev. B. 67, 054401 (2003)
High Field Magneto-Optic Measurements of Amorphous Gd-Si Alloys, F. Hellman, W. Geerts and B. Donehew, Phys. Rev. B. 67, 012406 (2003)
Structural and Magnetic Length Scales in Amorphous TbFe2, T. C. Hufnagel and F. Hellman, J. Magn. Magn. Mat. 256/1-3, 322 (2003)
Magnetic Moments and Interactions Near the Metal-Insulator Transition in Amorphous Magnetic Semiconductors, B. L. Zink, V. Preisler, D. R. Queen, and F. Hellman, Phys. Rev. B 66, 19528 (2002)
Oxygen-Assisted Room-Temperature Deposition of CoPt3 Films with Perpendicular Magnetic Anisotropy, B. B. Maranville and F. Hellman, Appl. Phys. Lett. 81, 4011-13 (2002)
Tricritical Point and the Doping Dependence of the Order of the Ferromagnetic Phase Transition of La1-xCaxMnO3, D. Kim, B. Revaz, B. L. Zink, F. Hellman, J. F. Mitchell and J. J. Rhyne, Phys. Rev. Lett. 89, 7202-06 (2002)
Enhancement of the electronic contribution to the low temperature specific heat of an Fe/Cr magnetic multilayer, B. Revaz, M.-C. Cyrille, B. Zink, I. K. Schuller and F. Hellman, Phys. Rev. B 65, 944171 (2002)
Thin Film Microcalorimeter for Heat Capacity Measurements in High Magnetic Fields, B. L. Zink, B. Revaz, R. Sappey, F. Hellman, Rev. Sci. Instr. 73, 1841 (2002)
Infrared probe of metal-insulator transition in Si1-xGdx and Si1-xYx amorphous alloys in magnetic field, D. N. Basov, A. M. Bratkovsky, P. F. Henning, B. Zink, F. Hellman, C. C. Homes, and M. Strongin, Europhys. Lett. 57, 240-6 (2002)
Critical properties of La1-xSrxMnO3, D. Kim, F. Hellman, and J. M. D. Coey, Phys. Rev. B 65, 214424 (2002)
Miscut-angle dependence of perpendicular magnetic anisotropy in thin epitaxial CoPt3 films grown on vicinal MgO, B. B. Maranville, A. L. Shapiro, F. Hellman, D. M. Schaadt and E. T. Yu, Appl. Phys. Lett. 81, 517 (2002)
Thin film microcalorimeter for measurement of specific heat in high magnetic fields, B. L. Zink, B. Revaz, R. Sappey and F. Hellman, Rev. Sci. Instrum. 73, 1841 (2002)
Magnetic Anisotropy in Films, F. Hellman, article in the Encyclopedia of Materials: Science and Technology, Elsevier (in press).
Enhancement of the electronic contribution to the low temperature specific heat of Fe/Cr magnetic multilayer, B. Revaz, M.-C. Cyrille, B. L. Zink, I. K. Schuller and F. Hellman, Phys. Rev. B 65, 094417 (2002)
Ion-beam assisted growth of perpendicular anisotropy materials, D. Vasumathi, B. M. Maranville, and F. Hellman, Appl. Phys. Lett. 79, 2782 (2001)
Growth-induced perpendicular magnetic anisotropy and clustering in NixPt1-x alloys, D. Vasumathi, A. L. Shapiro, B. B. Maranville, and F. Hellman J. Magn. Magn. Mat. 223, 221 (2001)
The Density of States of Amorphous GdxSi1-x at the Metal-Insulator Transition, W. Teizer, F. Hellman, and R. C. Dynes, Phys. Rev. Lett. 85, 848 (2000)
Spin Glass Freezing and RKKY Interactions Near the Metal-Insulator Transition in Amorphous Gd-Si Alloys, W. Teizer, F. Hellman, and R. C. Dynes, Phys. Rev. Lett. 85, 848 (2000)
The Density of States of Amorphous GdxSi1-x at the Metal-Insulator Transition, F. Hellman, D. R. Queen, R. M. Potok, and B. L. Zink, Phys. Rev. Lett. 84, 5411 (2000)
Magnetic Field Induced Insulator-Metal Transition in a-GdxSi1-x, W. Teizer, F. Hellman, and R. C. Dynes, Solid State Communications 114, 81 (2000)
Growth-Induced Magnetic Anisotropy and Clustering in Vapor-Deposited Co-Pt Alloy Films, A. L. Shapiro, P.W. Rooney, M. Q. Tran, F. Hellman, K. M. Ring, K. L. Kavanagh, B. Rellinghaus, and D.Weller, Phys Rev. B 60, R12826 (1999)
Suppression of growth-induced perpendicular magnetic anisotropy in Co-Pt alloys by trace amounts of Si, A. L. Shapiro, O. Vajk, B. M. Maranville, and F. Hellman,Appl. Phys. Lett. 75, 4177 (1999)
Large Magnetic Entropy in Giant Magnetoresistive Amorphous Gadolinium Silicon, B. L. Zink, E. Janod, K. Allen, F. Hellman,Phys. Rev. Lett. 83, 2266 (1999)
Specific Heat of Endohedral and Higher Fullerene Thin Films, K. Allen, F. Hellman, Journal of Chemical Physics, vol.111, (no.12), AIP, 22 Sept. 1999. p.5291-4
Specific Heat of C60 and K3C60 Thin Films, 6-400 K, K. Allen, F. Hellman, Phys Rev. B 60, R11765 (1999)
Long Ferromagnetic Correlation Length in Amorphous TbFe2, F. Hellman, A. L. Shapiro, E. N. Abarra, R. A. Robinson, R. P. Hjelm, P.A. Seeger, J. J. Rhyne, and J. I. Suzuki, Phys. Rev. B 59, 11408 (1999)
Low temperature Magnetoresistance in Insulating a-Si:Gd Alloys, P. Xiong, B. L. Zink, S. I. Applebaum, F. Hellman, and R. C. Dynes, Phys. Rev. B 59, R3929 (1999)
Coercivity in Amorphous Tb-Fe alloys, F. Hellman, M. Messer, and E. N. Abarra, J. Appl. Phys. 86, 1047 (1999)
Specific heat of amorphous rare-earth-transition-metal films, F. Hellman, E. N. Abarra, A. L. Shapiro, R. B. van Dover, Phys. Rev. B 58, 5672 (1998)
Destruction of Superconductivity in the Narrow-band Metal, K3C60, Susan Watson, Kimberly Allen, D. W. Denlinger, and F. Hellman, Phys. Rev. B 55, 3866 (1997). (abstract)
Metal-Insulator Transition and Giant Negative Magnetoresistance in Amorphous Magnetic Rare Earth Silicon Alloys, F. Hellman, M. Q. Tran, A. E. Gebala, E. M. Wilcox, and R. C. Dynes, Phys. Rev. Lett. 22, 4652 (1996). (abstract)
Thermodynamic Measurements of Magnetic Ordering in Antiferromagnetic Superlattices, E. N. Abarra, K. Takano, A. E. Berkowitz, and F. Hellman, Phys Rev Lett 77, 3451 (1996)
Evidence of a Surface-Mediated Magnetically-Induced Miscibility Gap in Co-Pt Alloy Thin Films, P.W. Rooney, A. L. Shapiro, M. Q. Tran, and F. Hellman, Phys. Rev. Lett. 75, 1843 (1995)
Thin Film Microcalorimeter for Heat Capacity Measurements from 1.5 to 800 K, D. W. Denlinger, E. N. Abarra, Kimberly Allen, P. W. Rooney, S. K. Watson, and F. Hellman , Rev. Sci. Instrum. 65, 946 (1994). (abstract)
Surface-induced Ordering: A Model for Vapor-deposition Growth of Amorphous Materials, F. Hellman, Appl. Phys. Lett. 64, 1947 (1994)