Axel Hoffmann

For More Information

• Hoffman Research Group

Education

• Ph.D., Physics, University of California – San Diego, 1999
• Diplom, Physics, RWTH Aachen, Germany, 1994

Biography

Axel Hoffmann has obtained his Diploma degree in physics from the RWTH Aachen in 1994 and his PhD degree in physics from the University of California – San Diego in 1999. Subsequently he worked at the Los Alamos National Laboratory as a postdoctoral fellow. In 2001 he joined the Argonne National Laboratory as a staff scientist, and became in 2014 the Senior Group Leader of the Magnetic Thin Film Group. In 2019 he joined the Department of Materials Science an Engineering at the University of Illinois at Urbana-Champaign as a Founder Professor. His research interests encompass a wide variety of magnetism related subjects, including basic properties of magnetic heterostructures, spin-transport in novel geometries, and magnetization dynamics. He is an Associate Editor for the Journal of Applied Physics and a fellow of the American Physical Society, American Vacuum Society, and IEEE.

Academic Positions

• Professor, University of Illinois at Urbana-Champaign, Materials Science and Engineering, 2019–present

Other Professional Employment

• Postdoctoral Fellow, Los Alamos National Laboratory, Los Almost, NM, 1999–2001
• Assistant Materials Scientist, Argonne National Laboratory, Lemont, IL, 2001–2005
• Materials Scientist, Argonne National Laboratory, Lemont, IL, 2005–2014
• Senior Group Leader, Argonne National Laboratory, Lemont, IL, 2014–2019

Major Consulting Activities

• Associate Editor, Journal of Applied Physics, American Institute or Physics, 2009–present

Research Topics

• Electronics & Communications
• Nanoscale Science and Technology
• Quantum Information Processing
• RF and microwave engineering

Books Edited or Co-Edited (Original Editions)

• Topology in Magnetism Edited by J. Zhang, V. Cros, and A. Hoffmann, (Springer, New York, September 2018).
• Recent Advances in Magnetic Insulators – From Spintronics to Microwave Applications Edited by M. Wu and A. Hoffmann, Solid State Physics, vol. 64 (Academic Press, Oxford, December 2013).

Chapters in Books

• Spin-Orbit Torques W. Zhang, M. B. Jungfleisch, R. Winkler, and A. Hoffmann, In: Spin Physics in Semiconductors, 2nd edition, edited by Michael I. Dyakonov (Springer, New York, 2017), p. 355–385.

Selected Articles in Journals

• Probing intrinsic magnon bandgap in a layered hybrid perovskite antiferromagnet by a superconducting resonator, Y. Li, T. Draher, A. H. Comstock, Y. Xiong, Md. A. Haque, E. Easy J. Qian, T. Polakovic, J. E. Pearson, R. Divan, J.-M. Zuo, X. Zhang, U. Welp, W.-K. Kwok, A. Hoffmann, J. M. Luther, M. C. Beard, D. Sun, W. Zhang, and V. Novosad, Physical Review Research 5, 043031 (2023).
• Integrating magnons for quantum information, Z. Jiang, J. Lim, Y. Li, W. Pfaff, T.-H. Lo, J. Qian, A. Schleife, J.-M. Zuo, V. Novosad, and A. Hoffmann, Applied Physics Letters 123, 130501 (2023).
• Evidence of pseudogravitational distortions of the Fermi surface geometry in the antiferromagnetic metal FeRh, J. Sklenar, S. Shim, H. Saglam, J. Oh, M. G. Vergniory, A. Hoffmann, B. Bradlyn, N. Mason, and M. J. Gilbert, Communications Physics 6, 241 (2023).
• Unidirectional microwave transduction with chirality selected short-wavelength magnon excitations, Y. Li, T.-H. Lo, J. Lim, J. E. Pearson, R. Divan, W. Zhang, U. Welp, W.-K. Kwok, A. Hoffmann, and V. Novosad, Applied Physics Letters 123, 022406 (2023).
• The effects of field history on magnetic skyrmion formation in [Pt/Co/Ir]3 multilayers, A. T. Clark, X. Wang, A. R. Stuart, Q. Wang, W. Jiang, J. E. Pearson, S. G. E. te Velthuis, A. Hoffmann, X. M. Cheng, and K. S. Buchanan, Journal of Magnetism and Magnetic Materials 563, 169951 (2022).
• Spin Transport Modified by Magnetic Order, A. Hoffmann, Journal of Magnetism and Magnetic Materials 563, 169896 (2022).
• Topological spin memory of antiferromagnetically coupled skyrmion pairs in Co/Gd/Pt multilayers, X. Wang, A. R. Stuart, M. S. Swyt, C. M. Quispe Flores, A. T. Clark, A. Fiagbenu, R. V. Chopdekar, P. N. Lapa, Z. Xiao, D. Keavney, R. Rosenberg, M. Vogel, J. E. Pearson, S. G. E. te Velthuis, A. Hoffmann, K. S. Buchanan, and X. M. Cheng, Physical Review Materials 6, 084412 (2022).
• Large Exotic Spin Torques in Antiferromagnetic Iron Rhodium, J. Gibbons, T. Dohi, V. P. Amin, F. Xue, H. Ren, J.-W. Xu, H. Arava, S. Shim, H. Saglam, Y. Liu, J. E. Pearson, N. Mason, A. K. Petford-Long, P. M. Haney, M. D. Stiles, E. E. Fullerton, A. D. Kent, S. Fukami, and A. Hoffmann, Physical Review Applied 18, 024075 (2022).
• Dynamic fingerprints of synthetic antiferromagnet nanostructures with interfacial Dzyaloshinskii-Moriya interaction, M. Lonsky and A. Hoffmann, Journal of Applied Physics 132, 043903 (2022).
• Quantum materials for energy-efficient neuromorphic computing: Opportunities and challenges, A. Hoffmann, S. Ramanathan, J Grollier, A. D. Kent, M. J. Rozenberg, I. K. Schuller, O. G. Shpyrko, R. C. Dynes, Y. Fainman, A. Frano, E. E. Fullerton, G. Galli, V. Lomakin, S. P. Ong, A. K. Petford-Long, J. A. Schuller, M. D. Stiles, Y. Takamura, and Y. Zhu, APL Materials 10, 070904 (2022).
• Unidirectional Magnetoresistance in Antiferromagnet/Heavy-Metal Bilayers, S. Shim, M. Mehraeen, J. Sklenar, J. Oh, J. Gibbons, H. Saglam, A. Hoffmann, S. S. L. Zhang, and N. Mason, Physical Review X 12, 021069 (2022).
• Multiple magnetic droplet solitons from exotic spin-orbit torques, R. Klause and A. Hoffmann, Applied Physics Letters 120, 242407 (2022).
• Structural and magnetic properties of Pt/Co/Mn-based multilayers, M Lonsky, M.-W. Yoo, Y.-S. Huang, J. Qian, J.-M. Zuo, and A. Hoffmann, Physical Review Materials 6, 054413 (2022).
• Neuromorphic computing: Challenges from quantum materials to emergent connectivity, I. K. Schuller, A. Frano, R. C. Dynes, A. Hoffmann, B. Noheda, C. Schuman, A. Sebastian, and J. Shen, Applied Physics Letters 120, 140401 (2022).
• Antiferromagnets for Spintronics, A. Hoffmann and W. Zhang, Journal of Magnetism and Magnetic Materials 553, 169216 (2022).
• Coherent Control of Asymmetric Terahertz Emission from Two-Dimensional Hybrid Metal Halides, K. Cong, E. Vetter, Y. Liang, Y. Li, Q. Zhang, Y. Xiong, H. Qu, R. Schaller, A. Hoffmann, A. F. Kemper, W. You, H. Wen, W. Zhang, and D. Sun, Nature Communications 12, 5744 (2021).
• Electric-field control of magnon spin currents in an antiferromagnetic insulator, C. Liu, Y. Luo, D. Hong, S. S.-L. Zhang, H. Saglam, Y. Li, Y. Lin, B. Fisher, J. E. Pearson, J. S. Jiang, H. Zhou, J. Wen, A. Hoffmann, and A. Bhattacharya, Science Advances 7, eabg1669 (2021).
• Field-Tunable Interactions and Frustration in Underlayer-Mediated Artificial Spin Ice, S. Kempinger, Y.-S. Huang, P. Lammert, M. Vogel, A. Hoffmann, V. H. Crespi, P. Schiffer, and N. Samarth, Physical Review Letters 127, 117203 (2021).
• Thermal and Hybridized Magnons, A. Hoffmann, Journal of Magnetism and Magnetic Materials 539, 168391 (2021).
• Quantum Engineering with Hybrid Magnonics Systems and Materials, D. D. Awschalom, C. H. R. Du, R. He, F. J. Heremans, A. Hoffmann, J. T. Hou, H. Kurebayashi, Y. Li, L. Liu, V. Novosad, J. Sklenar, S. E. Sullivan, D. Sun, H. Tang, V. Tiberkevich, C. Trevillian, A. W. Tsen, L. R. Weiss, W. Zhang, X. Zhang, L. Zhao, and C. W. Zollitsch, IEEE Transactions on Quantum Engineering 2, 5500836 (2021).
• Antiferromagnetic Oxide Thin Films for Spintronics Applications, S. A. Siddiqui, D. Hong, J. E. Pearson, and A. Hoffmann, Coatings 11, 786 (2021).
• Roadmap of Spin-Orbit Torques, Q. Shao, P. Li, L. Liu, H. Yang, S. Fukami, A. Razavi, H. Wu, K. Wang, F. Freimuth, Y. Mokrousov, M. D. Stiles, S. Emori, A. Hoffmann, J. Åkerman, K. Roy, J.-P. Wang, S. H. Yang, K. Garello, and W. Zhang, IEEE Transactions on Magnetics 57, 800439 (2021).
• Large spin-to-charge conversion in ultrathin gold-silicon multilayers, M. S. El Hadri, J. Gibbons, Y Xiao, H. Ren, H. Arava, Z. Liu, A. Petford-Long, A. Hoffmann, and E. E. Fullerton, Physical Review Materials 5, 064410 (2021).
• Proximity-induced anisotropic magnetoresistance in magnetized topological insulators, J. Sklenar, Y. Zhang, M. B. Jungfleisch, Y. Kim, Y. Xiao, G. J. MacDougall, M. J. Gilbert, A. Hoffmann, P. Schiffer, and N. Mason, Applied Physics Letters 118, 232402 (2021).
• Advances in coherent coupling between magnons and acoustic phonons, Y. Li, C. Zhao, W. Zhang, A. Hoffmann, and V. Novosad, APL Materials 9, 060902 (2021).
• Phase-resolved electrical detection of coherently coupled magnonic devices, Y. Li, C. Zhao, V. P. Amin, Z. Zhang, M. Vogel, Y. Xiong, J. Sklenar, R. Divan, J. Pearson, M. D. Stiles, W. Zhang, A. Hoffmann, and V. Novosad, Applied Physics Letters 118, 202403 (2021).
• Time refraction of spin waves, K. Schultheiss, N. Sato, P. Matthies, L. Körber, K. Wagner, T. Hula, O. Gladii, J. E. Pearson, A. Hoffmann, M. Helm, J. Fassbender, and H. Schultheiss, Physical Review Letters 126, 137201 (2021).
• Direct Imaging of Resonant Phonon-Magnon Coupling, C. Zhao, Z. Zhang, Y. Li, W. Zhang, J. E. Pearson, R. Divan, Q. Liu, V. Novosad, J. Wang, and A. Hoffmann Physical Review Applied 15, 014052 (2021).
• Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator P. Li, J. Ding, S. S.-L. Zhang, J. Kally, T. Pillsbury, O. G. Heinonen, G. Rimal, C. Bi, A. DeMann, S. B. Field, W. Wang, J. Tang, J. S. Jiang, A. Hoffmann, N. Samarth, and M. Wu, Nano Letters 21, 84 (2021).
• Distinguishing antiferromagnetic spin sublattices via the spin Seebeck effect Y. Luo, C. Liu, H. Saglam, Y. Li, W. Zhang, S. S.-L. Zhang, J. E. Pearson, B. Fisher, T. Zhou, A. Bhattacharya, and A. Hoffmann, Physical Review B 103, L020401 (2021).
• Ferromagnetic resonance in single vertices and 2D lattices macro-dipoles of elongated nanoelements: measurements and simulation W. Bang, R. Silvani, A. Hoffmann, J. B. Ketterson, F. Montoncello, and M. B. Jungfleisch, Journal of Physics: Condensed Matter 33, 065803 (2021).
• Experimental parameters, combined dynamics, and nonlinearity of a magnonic-opto-electronic oscillator (MOEO) Y. Xiong, Z. Zhang, Y. Li, M. Hammami, J. Sklenar, L. Alahmed, P. Li, T. Sebastian, H. Qu, A. Hoffmann, V. Novosad, and W. Zhang, Review of Scientific Instruments 91, 125105 (2020).
• Dynamic excitations of chiral magnetic textures M. Lonsky and A. Hoffmann, APL Materials 8, 100903 (2020).
• Hybrid magnonics: Physics, circuits, and applications for coherent information processing Y. Li, W. Zhang, V. Tyberkevych, W.-K. Kwok, A. Hoffmann, and V. Novosad, Journal of Applied Physics 128, 130902 (2020).
• Coupled skyrmion breathing modes in synthetic ferri- and antiferromagnets M. Lonsky and A. Hoffmann, Physical Review B 102, 104403 (2020).
• Intrinsic Mechanism for Anisotropic Magnetoresistance and Experimental Confirmation in CoxFe1-x Single-Crystal Films F. L. Zeng, Z. Y. Ren, Y. Li, J. Y. Zeng, M. W. Jia, J. Miao, A. Hoffmann, W. Zhang, Y. Z. Wu, and Z. Yuan, Physical Review Letters 125, 097201 (2020).
• Metallic antiferromagnets S. A. Siddiqui, J. Sklenar, K. Kang, M. J. Gilbert, A. Schleife, N. Mason, and, A. Hoffmann, Journal of Applied Physics 128, 040904 (2020).
• Influence of Vertex Region on Spin Dynamics in Artificial Kagome Spin Ice W. Bang, J. Sturm, R. Silvani, M. T. Kaffash, A. Hoffmann, J. B. Ketterson, F. Montoncello, and M. B. Jungfleisch, Physical Review Applied 14, 014079 (2020).
• Temperature-dependent anisotropic magnetoresistance and spin-torque-driven vortex dynamics in a single microdisk S. Lendinez, T. Polakovic, J. Ding, M. B. Jungfleisch, J. Pearson, A. Hoffmann, and V. Novosad, Journal of Applied Physics 127, 243904 (2020).
• Control of spin dynamics in artificial honeycomb spin-ice-based nanodisks M. T. Kaffash, W. Bang, S. Lendinez, A. Hoffmann, J. B. Ketterson, and M. B. Jungfleisch, Physical Review B 101, 174424 (2020).
• Phonon Transport Controlled by Ferromagnetic Resonance C. Zhao, Y. Li, Z. Zhang, M. Vogel, J. E. Pearson, J. Wang, W. Zhang, V. Novosad, Q. Liu, and A. Hoffmann, Physical Review Applied 13, 054032 (2020).
• Coherent Spin Pumping in a Strongly Coupled Magnon-Magnon Hybrid System Y. Li, W. Cao, V. P. Amin, Z. Zhang, J. Gibbons, J. Sklenar, J. Pearson, P. M. Haney, M. D. Stiles, W. E. Bailey, V. Novosad, A. Hoffmann, and W. Zhang, Physical Review Letters 124, 117202 (2020).
• Direct observation of spin accumulation in Cu induced by spin pumping J. Ding, W. Zhang, M. B. Jungfleisch, J. E. Pearson, H. Ohldag, V. Novosad, and A. Hoffmann, Physical Review Research 2, 013262 (2020).
• Magnetic Damping Modulation in IrMn3/Ni80Fe20 via the Magnetic Spin Hall Effect, J. Holanda, H. Saglam, V. Karakas, Z. Zhang, Y. Li, R. Divan, Y. Liu, O. Ozatay, V. Novosad, J. E. Pearson, and A. Hoffmann, Physical Review Letters 124, 087204 (2020).
• Generation and Hall effect of skyrmions enabled via using nonmagnetic constriction Z. Wang, X. Zhang, J. Xia, L. Zhao, K. Wu, G. Yu, K. L. Wang, X. Liu, S. G. E. te Velthuis, A. Hoffmann, Y. Zhou, and W. Jiang, Physical Review B 100, 184426 (2019).
• Strong Coupling between Magnons and Microwave Photons in On-Chip Ferromagnet-Superconducting Thin-Film Devices Y. Li, T. Polakovic, Y.-L. Wei, J. Xu, S. Lendinez, Z. Zhang, J. Ding, T. Khaire, H. Saglam, R. Divan, J. Pearson, W.-K. Kwok, Z. Xiao, V. Novosad, A. Hoffmann, and W. Zhang, Physical Review Letters 123, 107701 (2019).
• Magnetization switching utilizing topological surface states P. Li, J. Kally, S. S.-L. Zhang, T. Pillsbury, J. Ding, G. Csaba, J. Ding, J. S. Jiang, Y. Liu, R. Sinclair, C. Bi, A. DeMann, G. Rimal, W. Zhang, S. B. Field, J. Tang, W. Wang, O. G. Heinonen, V. Novosad, A. Hoffmann, N. Samarth, and M. Wu, Science Advances 5, eaaw3415 (2019).
• Controlled interconversion of quantized spin wave modes via local magnetic fields Z. Zhang, M. Vogel, J. Holanda, J. Ding, M. B. Jungfleisch, Y. Li, J. E. Pearson, R. Divan, W. Zhang, A. Hoffmann, Y. Nie, and V. Novosad, Physical Review B 100, 014429 (2019).
• Giant anisotropy of Gilbert damping up to 300% in epitaxial CoFe films Y. Li, F. Zeng, S. Zhang, H. Shin, H. Saglam, V. Karakas, O. Ozatay, J. E. Pearson, O. G. Heinonen, Y. Wu, A. Hoffmann, and W. Zhang, Physical Review Letters 122, 117203 (2019).
• Simultaneous Optical and Electrical Spin-Torque Magnetometry with Phase-Sensitive Detection of Spin Precession Y. Li, H. Saglam, Z. Zhang, R. Bidthanapally, Y. Xiong, J. E. Pearson, V. Novosad, H. Qu, G. Srinivasan, A. Hoffmann, and W. Zhang, Physical Review Applied 11, 034047 (2019).
• Quantifying chiral exchange interaction for Néel-type skyrmions via Lorentz transmission electron microscopy W. Jiang, S. Zhang, X. Wang, C. Phatak, Q. Wang, W. Zhang, M. B. Jungfleisch, J. E. Pearson, Y. Liu, J. Zang, X. Cheng, A. Petford-Long, A. Hoffmann, and S. G. E. te Velthuis, Physical Review B 99, 104402 (2019).
• Independence of spin-orbit torques from the exchange bias direction in Ni81Fe19/IrMn bilayers H. Saglam, J. C. Rojas-Sanchez, S. Petit, M. Hehn, W. Zhang, J. E. Pearson, S. Mangin, and A. Hoffmann, Physical Review B 98, 094407 (2018).
• Control of Terahertz Emission by Ultrafast Spin-Charge Current Conversion at Rashba Interfaces M. B. Jungfleisch, Q. Zhang, W. Zhang, J. E. Pearson, R. D. Schaller, H. Wen, and A. Hoffmann, Physical Review Letters 120, 207207 (2018).
• Spin transport and spin torque in antiferromagnetic devices J. Železný, P. Wadley, K. Olenik, A. Hoffmann, and H. Ohno, Nature Physics 14, 220 (2018).
• Perspectives of antiferromagnetic spintronics M. B. Jungfleisch, W. Zhang, and A. Hoffmann, Physics Letters A 382, 865 (2018).
• High-Frequency Dynamics Modulated by Collective Magnetizatio Reversal in Artificial Spin Ice M. B. Jungfleisch, J. Sklenar, J. Ding, J. Park, J. E. Pearson, V. Novosad, P. Schiffer, and A. Hoffmann, Physical Review Applied 8, 064026 (2017).
• Determination of spin relaxation times in heavy metals via 2nd harmonic spin injection magnetoresistance C. Fang, C. H. Wan, B. S. Yang, J. Y. Qin, B. S. Tao, H. Wu, X. Zhang, X. F. Han, A. Hoffmann, X. M. Liu, and Z. M. Jin, Physical Review B 98, 134421 (2017).
• Magentization reversal in Py/Gd heterostructures, P. N. Lapa, J. Ding, J. E. Pearson, V. Novosad, J. S. Jiang, and A. Hoffmann, Physical Review B 96, 024418 (2017).
• Unidirectional spin-torque driven magnetization dynamics, J. Sklenar, W. Zhang, M. B. Jungfleisch, H. Saglam, S. Grudichak, W. Jiang, J. E. Pearson, J. B. Ketterson, and A. Hoffmann, Physical Review B 95, 224431 (2017).
• Interface-induced phenomena in magnetism F. Hellman, A. Hoffmann, Y. Tserkovnyak, G. S. D. Beach, E. E. Fullerton, C. Leighton, A. H. MacDonald, D. C. Ralph, D. A. Arena, H. A. Dürr, P. Fischer, J. Grollier, J. P. Heremans, T. Jungwirth, A. V. Kimel, B. Koopmans, I. N. Krivorotov, S. J. May, A. K. Petford-Long, J. M. Rondinelli, N. Samarth, I. K. Schuller, A. N. Slavin, M. D. Stiles, O. Tchernyshov, and A. Thiaville, Review of Modern Physics 89, 025006 (2017).
• Direct observation of the skyrmion Hall effect W. Jiang, X. Zhang, G. Yu, W. Zhang, M. B. Jungfleisch, J. E. Pearson, O. Heinonen, K. L. Wang, Y. Zhou, A. Hoffmann, and S. G. E. te Velthuis, Nature Physics 13, 162 (2017).
• Insulating Nanomagnets Driven by Spin Torque, M. B. Jungfleisch, J. Ding, H. Saglam, W. Zhang, W. Jiang, J. E. Pearson, V. Novosad, and A. Hoffmann, Nano Letters 17, 8 (2017).
• Spin transport through the metallic antiferromagnet FeMn, H. Saglam, W. Zhang, M. B. Jungfleisch, J. Sklenar, W. Jiang, J. E. Pearson, J. B. Ketterson, and A. Hoffmann, Physical Review B 94, 140412(R) (2016).
• Interface-driven spin-torque ferromagnetic resonance by Rashba coupling at the interface between nonmagnetic materials, M. B. Jungfleisch, W. Zhang, J. Sklenar, W. Jiang, J. E. Pearson, J. B. Ketterson, and A. Hoffmann, Physical Review B 93, 224419 (2016).
• Research Update: Spin transfer torques in permalloy on monolayer MoS2, W. Zhang, J. Sklenar, B. Hsu, W. Jiang, M. B. Jungfleisch, J. Xiao, F. Y. Fradin, Y. Liu, J. E. Pearson, J. B. Ketterson, Z. Yang, and A. Hoffmann, APL Materials 4, 032302 (2016).
• Antiferromagnetic Spin Seebeck Effect S. Wu, W. Zhang, A. KC, P. Borisov, J. E. Pearson, J. S. Jiang, D. Lederman, A. Hoffmann, and A. Bhattacharya, Physical Review Letters 116, 097204 (2016).
• Large spin-wave bullet in a ferrimagnetic insulator driven by spin Hall effect, M. B. Jungfleisch, W. Zhang, J. Sklenar, J. Ding, W. Jiang, H. Chang, F. Y. Fradin, J. E. Pearson, J. B. Ketterson, V. Novosad, M. Wu, and A. Hoffmann, Physical Review Letters 116, 057601 (2016).
• Epitaxial patterning of nanometer-thick Y3Fe5O12 films with low magnetic damping S. Li, W. Zhang, J. Ding, J. E. Pearson, V. Novosad, and A. Hoffmann, Nanoscale 8, 388 (2016).
• Driving and detecting ferromagnetic resonance in insulators with the spin Hall effect, J. Sklenar, W. Zhang, M. B. Jungfleisch, W. Jiang, H. Chang, J. E. Pearson, M. Wu, J. B. Ketterson, and A. Hoffmann, Physical Review B 92, 174406 (2015).
• All-electrical manipulation of magnetization dynamics in a ferromagnet by antiferromagnets with anisotropic spin Hall effects, W. Zhang, M. B. Jungfleisch, F. Freimuth, W. Jiang, J. Sklenar, J. E. Pearson, J. B. Ketterson, Y. Mokrousov, and A. Hoffmann, Physical Review B 92, 144005 (2015).
• Opportunities at the Frontiers of Spintronics A. Hoffmann and S. D. Bader, Physical Review Applied 4, 047001 (2015).
• Blowing Magnetic Skyrmion Bubbles W. Jiang, P. Upadhyaya, W. Zhang, G. Yu, M. B. Jungfleisch, F. Y. Fradin, J. E. Pearson, Y. Tserkovnyak, K. L. Wang, O. Heinonen, S. G. E. te Velthuis, and A. Hoffmann, Science 349, 283 (2015).
• Reduced spin-Hall effects from magnetic proximity W. Zhang, M. B. Jungfleisch, W. Jiang, Y. Liu, J. E. Pearson, S. G. E. te Velthuis, A. Hoffmann, F. Freimuth, and Y. Mokrousov, Physical Review B 91, 115316 (2015).
• Spin Hall Effects in Metallic Antiferromagnets W. Zhang, M. B. Jungfleisch, W. Jiang, J. E. Pearson, A. Hoffmann, F. Freimuth, and Y. Mokrousov, Physical Review Letters 113, 196602 (2014).
• Realization of a spin-wave multiplexer, K. Vogt, F. Y. Fradin, J. E. Pearson, S. D. Bader, T. Sebastian, B. Hillebrands, A. Hoffmann, and H. Schultheiss, Nature Communications 5, 3727 (2014).
• Determination of the Pt spin diffusion length by spin-pumping and spin Hall effect W. Zhang, V. Vlaminck, J. E. Pearson, R. Divan, S. D. Bader, and A. Hoffmann, Applied Physics Letters 103, 242414 (2013).
• Spin Hall Effects in Metals A. Hoffmann, IEEE Transactions on Magnetics 49, 5172 (2013).
• Thermoelectric detection of spin waves H. Schultheiss, J.E. Pearson, S.D. Bader and A. Hoffmann, Physical Review Letters 109, 237204 (2012).
• Spin waves turning a corner, K. Vogt, H. Schultheiss, S. Jain, J. E. Pearson, A. Hoffmann, S. D. Bader, and B. Hillebrands, Applied Physics Letters 101, 042410 (2012).
• Detection and quantification of inverse spin Hall effect from spin pumping in permalloy/normal metal bilayers O. Mosendz, V. Vlaminck, J. E. Pearson, F. Y. Fradin, G. E. W. Bauer, S. D. Bader, and A. Hoffmann, Physical Review B 82, 214403 (2010).
• Surface spin flip probabilities in mesoscopic Ag wires G. Mihajlović, J. E. Pearson, S. D. Bader, and A. Hoffmann, Physical Review Letters 104, 237202 (2010).
• Quantifying spin Hall angles from spin pumping: Experiments and theory O. Mosendz, J. E. Pearson, F. Y. Fradin, G. E. W. Bauer, S. D. Bader, and A. Hoffmann, Physical Review Letters 104, 046601 (2010).
• Negative Nonlocal Resistance in Mesoscopic Gold Hall Bars: Absence of the Giant Spin Hall Effect G. Mihajlović, J. E. Pearson, M. A. Garcia, S. D. Bader, and A. Hoffmann, Physical Review Letters 103, 166601 (2009).
• Symmetry driven irreversibilities at ferromagnetic-antiferromagnetic interfaces A. Hoffmann, Physical Review Letters 93, 097203 (2004).

Articles in Conference Proceedings

• Hybrid-Magnon Quantum Devices: Strategies and Approaches, Y. Li, J.-C. Qian, Z.-H. Jiang, T.-H. Lo, D. Ding, T. Draher, T. Polakovic, W. Pfaff, A. Schleife, J.-M. Zuo, W.-K. Kwok, V. Novosad, and A. Hoffmann, 2022 IEEE International Electronic Devices Meeting, 14.6.1 (2022).
• Spin dynamics in permalloy nano-ellipses for honeycomb and square lattices, W. Bang, M. T. Kaffash, M. T. Hossain, A. Hoffmann, J. B. Ketterson, and M. B. Jungfleisch, AIP Advances 12, 035131 (2022).
• Temperature-dependent collective magnetization reversal in a network of ferromagnetic nanowires S. Lendinez, J. E. Pearson, A. Hoffmann, V. Novosad, and M. B. Jungfleisch, AIP Advances 11, 025222 (2021).
• Detecting Phase-Resolved Magnetization Dynamics by Magneto-Optic Effects at 1550 nm Wavelength Y. Xiong, Y. Li, R. Bidthanapally, J. Sklenar, M. Hammami, S. Hall, X. Zhang, P. Li, J. E. Pearson, T. Sebastian, G. Srinivasan, A. Hoffmann, H. Qu, V. Novosad, and W. Zhang, IEEE Transactions on Magnetics 57, 4300807 (2021).
• Spin pumping and inverse Rashba-Edelstein effect in NiFe/Ag/Bi and NiFe/Ag/Sb W. Zhang, M. B. Jungfleisch, W. Jiang, J. E. Pearson, and A. Hoffmann, Journal of Applied Physics 117, 17C727 (2015).
• Non-local spin injection in lateral spin valves Y. Ji, A. Hoffmann, J. S. Jiang, J. E. Pearson, and S. D. Bader, Journal of Physics D: Applied Physics 40, 1280 (2007).

Abstracts (in print or accepted)

• Developing computational skills through simulation based problem-solving in science, M. Lonsky, M. Lang, S. Holt, S. A. Pathak, R. Klause, T.-H. Lo, M. Beg, A. Hoffmann, and H. Fangohr, American Journal of Physics, to be published.
• Inverse Chirality-Induced Spin Selectivty Effect in Chiral Assemblies of p-Conjugated Polymers, R. Sun, K. S. Park, A. H. Comstock, A. McConnell, D. Beratan, W. You, A. Hoffmann, Z. G. Yu, Y. Diao, and D. Sun, Nature Materials, to be published.
• Epitaxial growth and magnetic properties of Kagome metal FnSn/elemental ferromagnet heterostructures, P. M. Laxmeesha, T. D. Tucker, R. K. Rai, S. Li, M.-W. Yoo, E. A. Stach, A. Hoffmann, and S. J. May, Journal of Applied Physics, to be published.  

Pending Articles

• Programmable Real-Time Magnon Interference in Two Remotely Coupled Magnonic Resonators, M. Song, T. Polakovic, J. Lim, T. W. Cecil, J. Pearson, R. Divan, W.-K. Kwok, U. Welp, A. Hoffmann, K.-J. Kim, V. Novosad, and Y. Li, Physical Review Letters, submitted.  

Invited Lectures

• Topological Quasiparticles: Magnetic Skyrmions

Patents

• US Patent # 11,474,283 ”Super Resolution for Magneto-Optical Microscopy” S. G. E. Te Velthuis, M. C. S. Vogel, and A. F. Hoffmann,
• US Patent # 7,042,036 ”Magnetic memory using single domain switching by direct current” S.-H. Chung and A. F. Hoffmann
• US Patent # 7,323,113 ”Pattern transfer with self-similar sacrificial mask layer and vector magnetic field sensor” A. Hoffmann
• US Patent # 7,639,359 ”Magneto-optic biosensor using bio-functionalized magnetized nanoparticles” S.-H. Chung, A. F. Hoffmann, and S. D. Bader

Journal Editorships

• Associate Editor, Journal of Applied Physics, since 2009

Research Honors

• Highly Cited Researcher for 2023, Web of Science Group (2023)
• Highly Cited Researcher for 2022, Web of Science Group (2022   )
• David Adler Lectureship Award in the field of Materials Physics, American Physical Society (2022)
• Highly Cited Researcher for 2021, Web of Science Group (2021)
• Highly Cited Researcher for 2020, Web of Science Group (2020)
• Highly Cited Researcher for 2019, Web of Science Group (2019)
• Distinguished Performance Award, University of Chicago (2017)
• Fellow, American Vacuum Society (2017)
• Outstanding Researcher Award of the AVS Prairie Chapter, American Vacuum Society (2015)
• Fellow, IEEE (2014)
• Fellow, American Physical Society (2011)
• Distinguished Lecturer, IEEE Magnetics Society (2011)
• Senior Membership, IEEE (2009)

Public Service Honors

• Outstanding Referee, American Physical Society (2014)

Other Honors

• Director’s Funded Postdoctoral Fellowship, Los Alamos National Laboratory, Los Alamos, NM (1999)
• Springorum Medal for Diploma thesis with honors, Rheinisch-Westfälische Technische Hochschule Aachen, Aachen, Germany (1995)

Recent Courses Taught

• MSE 304 - Electronic Properties of Matls
• MSE 464 (MSE 598 AH4, MSE 598 AHO, MSE 498 G, MSE 498 U) - Magnetic Mat'ls & Applications
• MSE 529 - Hard Materials Seminar