Details of the Researcher

PHOTO

Han Jiahao
Section
Center for Science and Innovation in Spintronics
Job title
Associate Professor
Degree

  • Ｐｈ．Ｄ．（Massachusetts Institute of Technology）

  • Ｍ．Ｓ．（Massachusetts Institute of Technology）

e-Rad No.
90990135

Research History 5

  • 2025/07 - Present
    Tohoku University　Center for Science and Innovation in Spintronics　Associate Professor

  • 2024/07 - Present
    Tohoku University　Advanced Institute for Materials Research　Associate Professor

  • 2023/08 - 2024/06
    Tohoku University　Advanced Institute for Materials Research　Assistant Professor

  • 2022/07 - 2023/07
    Tohoku University　Research Institute of Electrical Communication　JSPS Postdoctoral Fellow

  • 2022/04 - 2023/07
    Tohoku University　Research Institute of Electrical Communication　RIEC Research Fellow

Education 2

  • Massachusetts Institute of Technology　Department of Electrical Engineering and Computer Science　Doctor of Philosophy

    2016/08 - 2022/02

  • Tsinghua University　School of Materials Science and Engineering　Bachelor of Engineering

    2012/08 - 2016/07

Committee Memberships 2

  • Member and Treasurer, IEEE Magnetic Society Education Committee

    2025/01 - Present

  • Life Member, IEEE Magnetic Society

    2025/01 - Present

Research Interests 3

  • Spintronics

  • Topological and quantum materials

  • Electronic engineering

Research Areas 2

  • Nanotechnology/Materials / Applied materials / Magnetic materials

  • Natural sciences / Magnetism, superconductivity, and strongly correlated systems / Spintronics

Awards 4

  1. IEEE Magnetic Society Early Career Award

    2025/01　IEEE Magnetic Society

  2. Outstanding Dissertation in Magnetism Award

    2022/03　American Physical Society

  3. EECS Grass Instrument Fellowship

    2016/09　Massachusetts Institute of Technology

  4. Presidential Scholarship

    2015/12　Tsinghua University

Papers 30

  1. Unconventional spin Hall magnetoresistance in noncollinear antiferromagnet/heavy-metal stacks

    Tomohiro Uchimura, Jiahao Han, Ping Tang, Ju-Young Yoon, Yutaro Takeuchi, Yuta Yamane, Shun Kanai, Gerrit E. W. Bauer, Hideo Ohno, Shunsuke Fukami

    Physical Review Letters　134　096701　2025/03

    DOI： 10.1103/PhysRevLett.134.096701 　

  2. Electrical mutual switching in a noncollinear-antiferromagnetic–ferromagnetic heterostructure

    Ju-Young Yoon, Yutaro Takeuchi, Ryota Takechi, Jiahao Han, Tomohiro Uchimura, Yuta Yamane, Shun Kanai, Jun’ichi Ieda, Hideo Ohno, Shunsuke Fukami

    Nature Communications　16　1171　2025/02/05

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41467-025-56157-6 　

    eISSN： 2041-1723

  3. Unconventional responses in non-collinear antiferromagnets

    Jiahao Han, Ju-Young Yoon, Hideo Ohno, Shunsuke Fukami

    Newton　1　100012　2025/02

    DOI： 10.1016/j.newton.2025.100012 　

  4. Room-temperature flexible manipulation of the quantum-metric structure in a topological chiral antiferromagnet

    Jiahao Han, Tomohiro Uchimura, Yasufumi Araki, Ju-Young Yoon, Yutaro Takeuchi, Yuta Yamane, Shun Kanai, Jun’ichi Ieda, Hideo Ohno, Shunsuke Fukami

    Nature Physics　2024/04/22

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41567-024-02476-2 　

    ISSN： 1745-2473

    eISSN： 1745-2481

  5. Electrical manipulation of dissipation in microwave photon–magnon hybrid system through the spin Hall effect

    Justin T. Hou, Chung-Tao Chou, Jiahao Han, Yabin Fan, Luqiao Liu

    Applied Physics Letters　124　(072401)　2024/02

  6. Handedness anomaly in a non-collinear antiferromagnet under spin–orbit torque

    Ju-Young Yoon, Pengxiang Zhang, Chung-Tao Chou, Yutaro Takeuchi, Tomohiro Uchimura, Justin T. Hou, Jiahao Han, Shun Kanai, Hideo Ohno, Shunsuke Fukami, Luqiao Liu

    Nature Materials　22　(9)　1106-1113　2023/08/03

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41563-023-01620-2 　

    ISSN： 1476-1122

    eISSN： 1476-4660

  7. Observation of the Unidirectional Magnetoresistance in Antiferromagnetic Insulator Fe2O3/Pt Bilayers

    Yihong Fan, Pengxiang Zhang, Jiahao Han, Yang Lv, Luqiao Liu, Jian-Ping Wang

    ADVANCED ELECTRONIC MATERIALS　2023/05

    DOI： 10.1002/aelm.202300232 　

    ISSN： 2199-160X

  8. Coherent antiferromagnetic spintronics

    Jiahao Han, Ran Cheng, Luqiao Liu, Hideo Ohno, Shunsuke Fukami

    Nature Materials　22　(6)　684-695　2023/03/20

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41563-023-01492-6 　

    ISSN： 1476-1122

    eISSN： 1476-4660

  9. Spin-generation in magnetic Weyl semimetal Co2MnGa across varying degree of chemical order

    Taqiyyah S. S. Safi, Chung-Tao Chou, Justin T. T. Hou, Jiahao Han, Luqiao Liu

    APPLIED PHYSICS LETTERS　121　(9)　2022/08

    DOI： 10.1063/5.0102039 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  10. Current-induced switching of a ferromagnetic Weyl semimetal Co2MnGa

    Jiahao Han, Brooke C. McGoldrick, Chung-Tao Chou, Taqiyyah S. Safi, Justin T. Hou, Luqiao Liu

    Applied Physics Letters　119　(21)　2021/11/22

    Publisher: AIP Publishing

    DOI： 10.1063/5.0073537 　

    ISSN： 0003-6951

    eISSN： 1077-3118

    More details Close

    The introduction of magnetic moments to topological materials provides rich opportunities for studying the interplay among magnetism, electron correlation, and topological orders, which can give rise to exotic magnetoelectric effects and allow one to manipulate the topological band structure via spintronic approaches. Here, we report current-induced switching in a thin film of ferromagnetic Weyl semimetal Co2MnGa with perpendicular magnetic anisotropy, via the spin–orbit torque from a neighboring heavy metal Pt. The reversal of the large anomalous Hall signal indicates an effective electrical control of the Berry curvatures associated with the Weyl nodes in the topological band structure. The efficiency of the spin–orbit torque switching is calibrated to be comparable to that in conventional ferromagnets. Given the compatibility of Co2MnGa films with various spintronic devices and techniques, our work represents an essential step toward memory and computing devices built by topological ferromagnetic materials.

  11. Nonreciprocal Transmission of Incoherent Magnons with Asymmetric Diffusion Length

    Jiahao Han, Yabin Fan, Brooke C. McGoldrick, Joseph Finley, Justin T. Hou, Pengxiang Zhang, Luqiao Liu

    Nano Letters　21　(16)　7037-7043　2021/08/10

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.nanolett.1c02575 　

    ISSN： 1530-6984

    eISSN： 1530-6992

  12. Resonant Spin Transmission Mediated by Magnons in a Magnetic Insulator Multilayer Structure

    Yabin Fan, Joseph Finley, Jiahao Han, Megan E. Holtz, Patrick Quarterman, Pengxiang Zhang, Taqiyyah S. Safi, Justin T. Hou, Alexander J. Grutter, Luqiao Liu

    ADVANCED MATERIALS　33　(22)　2021/06

    DOI： 10.1002/adma.202008555 　

    ISSN： 0935-9648

    eISSN： 1521-4095

  13. Topological insulators for efficient spin–orbit torques

    Jiahao Han, Luqiao Liu

    APL Materials　9　(6)　2021/05/25

    Publisher: AIP Publishing

    DOI： 10.1063/5.0048619 　

    eISSN： 2166-532X

    More details Close

    Current-induced magnetic switching via spin–orbit torques has been extensively pursued for memory and logic applications with promising energy efficiency. Topological insulators are a group of materials with spin-momentum locked electronic states at the surface due to spin–orbit coupling, which can be harnessed to reach strong spin–orbit torques. In this paper, we summarize and compare the methods for calibrating the charge-spin conversion efficiency in topological insulators, with which topological insulators are identified as outstanding spin–orbit torque generators compared with the well-studied heavy metals. We then review the results of magnetic switching under reduced current density in topological insulator/ferromagnet heterostructures. Finally, we provide insights on current challenges as well as possible exploration directions in the emerging field of topological spintronics.

  14. Birefringence-like spin transport via linearly polarized antiferromagnetic magnons

    Jiahao Han, Pengxiang Zhang, Zhen Bi, Yabin Fan, Taqiyyah S. Safi, Junxiang Xiang, Joseph Finley, Liang Fu, Ran Cheng, Luqiao Liu

    Nature Nanotechnology　15　(7)　563-568　2020/06/01

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41565-020-0703-8 　

    ISSN： 1748-3387

    eISSN： 1748-3395

  15. Manipulation of Coupling and Magnon Transport in Magnetic Metal-Insulator Hybrid Structures

    Yabin Fan, P. Quarterman, Joseph Finley, Jiahao Han, Pengxiang Zhang, Justin T. Hou, Mark D. Stiles, Alexander J. Grutter, Luqiao Liu

    PHYSICAL REVIEW APPLIED　13　(6)　2020/06

    DOI： 10.1103/PhysRevApplied.13.061002 　

    ISSN： 2331-7019

  16. Variable spin-charge conversion across metal-insulator transition

    Taqiyyah S. Safi, Pengxiang Zhang, Yabin Fan, Zhongxun Guo, Jiahao Han, Ethan R. Rosenberg, Caroline Ross, Yaraslov Tserkovnyak, Luqiao Liu

    NATURE COMMUNICATIONS　11　(1)　2020/01

    DOI： 10.1038/s41467-020-14388-9 　

    ISSN： 2041-1723

  17. Mutual control of coherent spin waves and magnetic domain walls in a magnonic device

    Jiahao Han, Pengxiang Zhang, Justin T. Hou, Saima A. Siddiqui, Luqiao Liu

    Science　366　(6469)　1121-1125　2019/11/29

    Publisher: American Association for the Advancement of Science (AAAS)

    DOI： 10.1126/science.aau2610 　

    ISSN： 0036-8075

    eISSN： 1095-9203

    More details Close

    Toward magnonic devices The field of magnonics aims to use spin waves (SWs) and their associated quasiparticles—magnons—as carriers of information. Compared with the movement of charge in conventional electronics, a major advantage of SWs is reduced Joule heating. However, SWs are trickier to direct and control. Two groups now go a step further toward magnon-based devices. Han et al. show that in multilayer films, domain walls can be used to change the phase and magnitude of a spin wave. Wang et al. demonstrate how magnon currents can be used to switch the magnetization of an adjacent layer. Science , this issue p. 1121 , p. 1125

  18. Large spin-orbit torque observed in epitaxial SrIrO3 thin films

    Hailong Wang, Keng-Yuan Meng, Pengxiang Zhang, Justin T. Hou, Joseph Finley, Jiahao Han, Fengyuan Yang, Luqiao Liu

    APPLIED PHYSICS LETTERS　114　(23)　2019/06

    DOI： 10.1063/1.5097699 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  19. Spin-Orbit-Torque Switching Mediated by an Antiferromagnetic Insulator

    Hailong Wang, Joseph Finley, Pengxiang Zhang, Jiahao Han, Justin T. Hou, Luqiao Liu

    PHYSICAL REVIEW APPLIED　11　(4)　2019/04

    DOI： 10.1103/PhysRevApplied.11.044070 　

    ISSN： 2331-7019

  20. Current-Induced Domain Wall Motion in a Compensated Ferrimagnet

    Saima A. Siddiqui, Jiahao Han, Joseph T. Finley, Caroline A. Ross, Luqiao Liu

    PHYSICAL REVIEW LETTERS　121　(5)　2018/07

    DOI： 10.1103/PhysRevLett.121.057701 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  21. Optically Transparent Protective Coating for Plastics Using Dual Spray and Atmospheric Plasma Deposition

    Yichuan Ding, Siming Dong, Jiahao Han, Dongjing He, Zhenlin Zhao, Reinhold H. Dauskardt

    ADVANCED MATERIALS INTERFACES　5　(9)　2018/05

    DOI： 10.1002/admi.201701433 　

    ISSN： 2196-7350

  22. Room-Temperature Spin-Orbit Torque Switching Induced by a Topological Insulator

    Jiahao Han, A. Richardella, Saima A. Siddiqui, Joseph Finley, N. Samarth, Luqiao Liu

    Physical Review Letters　119　(7)　2017/08/18

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevlett.119.077702 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  23. Lateral transport properties of thermally excited magnons in yttrium iron garnet films

    X. J. Zhou, G. Y. Shi, J. H. Han, Q. H. Yang, Y. H. Rao, H. W. Zhang, L. L. Lang, S. M. Zhou, F. Pan, C. Song

    APPLIED PHYSICS LETTERS　110　(6)　2017/02

    DOI： 10.1063/1.4976074 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  24. Role of Carbon Bridge Length of Organosilicate Precursors on the Atmospheric Plasma Deposition of Transparent Bilayer Protective Coatings on Plastics

    Siming Dong, Jiahao Han, Zhenlin Zhao, Reinhold H. Dauskardt

    Plasma Processes and Polymers　13　(11)　1053-1060　2016/11

    DOI： 10.1002/ppap.201600024 　

    ISSN： 1612-8850

    eISSN： 1612-8869

  25. Vertical spin Hall magnetoresistance in Ta1−xPtx/YIG bilayers

    J. H. Han, G. Y. Shi, X. J. Zhou, Q. H. Yang, Y. H. Rao, G. Li, H. W. Zhang, F. Pan, C. Song

    Physical Review B　94　(13)　2016/10/06

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.94.134406 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  26. Strong Electrical Manipulation of Spin-Orbit Torque in Ferromagnetic Heterostructures

    Yinuo Yan, Caihua Wan, Xiangjun Zhou, Guoyi Shi, Bin Cui, Jiahao Han, Yihong Fan, Xiufeng Han, Kang L. Wang, Feng Pan, Cheng Song

    ADVANCED ELECTRONIC MATERIALS　2　(10)　2016/10

    DOI： 10.1002/aelm.201600219 　

    ISSN： 2199-160X

  27. Spin-Hall-Effect-Assisted Electroresistance in Antiferromagnets via 105 A/cm2 dc Current

    Jiahao Han, Yuyan Wang, Feng Pan, Cheng Song

    Scientific Reports　6　(1)　2016/08/22

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/srep31966 　

    eISSN： 2045-2322

    More details Close

    Abstract Antiferromagnet (AFM) spintronics with reduced electrical current is greatly expected to process information with high integration and low power consumption. In Pt/FeMn and Ta/FeMn hybrids, we observe significant resistance variation (up to 7% of the total resistance) manipulated by 105 A/cm2 dc current. We have excluded the contribution of isotropic structural effects, and confirmed the critical role of the spin Hall injection from Pt (or Ta) to FeMn. This electrical current-manipulated resistance (i.e. electroresistance) is proposed to be attributed to the spin-Hall-effect-induced spin-orbit torque in FeMn. Similar results have also been detected in plain IrMn films, where the charge current generates spin current via the spin Hall effect with the existence of Ir atoms. All the measurements are free from external magnetic fields and ferromagnets. Our findings present an interesting step towards high-efficiency spintronic devices.

  28. Spin Hall magnetoresistance in Nb/Y3Fe5O12 hybrids

    J. H. Han, Y. Y. Wang, Q. H. Yang, G. Y. Wang, F. Pan, C. Song

    physica status solidi (RRL) – Rapid Research Letters　9　(6)　371-374　2015/06

    Publisher: Wiley

    DOI： 10.1002/pssr.201510088 　

    ISSN： 1862-6254

    eISSN： 1862-6270

    More details Close

    We investigate the spin Hall magnetoresistance (SMR) in niobium (Nb) attached to Y3Fe5O12 near the superconducting critical temperature (Tc) of Nb. The SMR vanishes after cooling the sample below Tc, and recovers if the temperature is raised. When a magnetic field larger than the critical field of Nb is applied, the SMR re‐emerges with an enhanced magnitude even if the temperature is below Tc. The experimental results demonstrate that the SMR could be completely suppressed by the coupling between superconducting condensation and spin–orbit interaction in superconductors. In addition to the fundamental physics on the charge–spin interactions in superconductors, our work adds a different dimension to superconducting spintronics. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

  29. Antiferromagnet-controlled spin current transport in SrMnO3/Pt hybrids

    J. H. Han, C. Song, F. Li, Y. Y. Wang, G. Y. Wang, Q. H. Yang, F. Pan

    Physical Review B　90　(14)　2014/10/27

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.90.144431 　

    ISSN： 1098-0121

    eISSN： 1550-235X

  30. Realization of the Meminductor

    Jiahao Han, Cheng Song, Shuang Gao, Yuyan Wang, Chao Chen, Feng Pan

    ACS Nano　8　(10)　10043-10047　2014/10/01

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/nn502655u 　

    ISSN： 1936-0851

    eISSN： 1936-086X

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Presentations 14

  1. Manipulation of the quantum-metric structure in a topological chiral antiferromagnet Invited

    Jiahao Han

    2025 Joint MMM-Intermag Conference　2025/01

  2. Room-temperature flexible manipulation of the quantum-metric structure in a topological chiral antiferromagnet

    Jiahao Han

    2024 JSAP Autumn Meeting　2024/09

  3. Coherent antiferromagnetic spintronics: new opportunities for controlling spin and electronic states of antiferromagnets Invited

    Jiahao Han

    2024 International Conference on Superconductivity and Magnetism　2024/04

  4. Coherent antiferromagnetic spintronics: new opportunities for controlling the magnetic states of antiferromagnets Invited

    Jiahao Han

    GP-Spin/AIMR Mini Workshop on Quantum Magnonics　2024/02

  5. Coherent antiferromagnetic spintronics Invited

    Jiahao Han

    2023 Annual Conference on Magnetism and Magnetic Materials　2023/11

  6. Handedness anomaly in a non-collinear antiferromagnet under spin-orbit torque Invited

    Jiahao Han

    2023 International Workshop on Spintronic Memory and Logic　2023/10

  7. Nonreciprocal transmission of incoherent magnons with asymmetric diffusion length

    Jiahao Han

    2022 APS March Meeting　2022/03

  8. Harnessing magnetic switching and dynamics using electron and magnon spin currents Invited

    Jiahao Han

    2022 APS March Meeting　2022/03

  9. Birefringence-like spin transport via linearly polarized antiferromagnetic magnons

    Jiahao Han

    2020 Annual Conference on Magnetism and Magnetic Materials　2020/11

  10. Long-distance spin transmission in an antiferromagnetic insulator with easy-plane anisotropy Invited

    Jiahao Han

    2020 ECE and Hong Kong EDSSC Chapter Online Seminar　2020/05

  11. Mutual control of coherent spin waves and magnetic domain walls in a magnonic device

    Jiahao Han

    2019 APS March Meeting　2019/03

  12. Mutual control of coherent spin waves and magnetic domain walls in a magnonic device

    Jiahao Han

    2019 Joint MMM-Intermag Conference　2019/01

  13. Room-temperature spin-orbit torque switching induced by a topological insulator

    Jiahao Han

    2018 APS March Meeting　2018/03

  14. Room-temperature spin-orbit torque switching induced by a topological insulator

    Jiahao Han

    2017 Annual Conference on Magnetism and Magnetic Materials　2017/11

Show all Show first 5

Research Projects 3

  1. Room-temperature flexible manipulation of the quantum-metric structure in topological chiral antiferromagnets

    Jiahao Han

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2024/04 - 2027/03

  2. Revealing peculiar features and mechanisms of spin transport subject to non-collinear antiferromagnetic order

    Jiahao Han

    Offer Organization: Advanced Institute for Materials Research, Tohoku University

    System: AIMR Fusion Research

    Institution: Tohoku University

    2024/10 - 2025/03

  3. Exploring topological and quantum effects in ferromagnetic Weyl semimetals for spintronic devices

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

    Category: Grant-in-Aid for JSPS Fellows

    Institution: Tohoku University

    2022/07/27 - 2024/03/31

Teaching Experience 1

  1. Teaching Assistant of Probability　Massachusetts Institute of Technology