题目：Electrical manipulation and detection of chiral antiferromagnetic order in the topological antiferromagnet Mn3Sn and its device applications
报告人：Associate Prof. Dr. Tomoya Higo, Department of Physics, The University of Tokyo, Japan
时间：2023年8月11号 (周五) 上午10:00-12:00
地点：九龙湖校区田家炳楼南203
邀请人：陈太师
Abstract:
There has been a surge of interest in antiferromagnetic (AF) materials due to their favorable properties for device applications, including a very small stray field and ultrafast spin dynamics. These intriguing properties have led to breakthroughs, including the discovery of anisotropic magnetoresistance (AMR), which is an even-function response under time-reversal (TR) in collinear antiferromagnets. Another notable breakthrough is the observation of odd-function responses under TR in non-collinear antiferromagnets like Mn3Sn, such as the anomalous Hall effect (AHE). Recent studies have revealed that Mn3Sn is a magnetic Weyl semimetal with unique TR symmetry breaking (TRSB) AF structure hosting cluster magnetic octupoles and topological electronic structures, leading to large and controllable responses induced by the momentum-space Berry curvature. In contrast to the relativistic responses such as AMR, gigantic responses in Mn3Sn can be observed through the TR operation, namely the 180◦ spin rotation, enabling the same writing and reading protocols as those developed for ferromagnets (FMs). Because the TRSB AFMs are expected to be key materials to replace FMs in next-generation spintronics devices, studies on the electrical manipulation and detection of AF order in Mn3Sn, one of the best-studied TRSB AFMs, are being intensively conducted.
Biography:
Associate Professor Higo is engaged in research in condensed matter physics, spintronics, thermoelectrics, quantum materials, topological magnets, frustrated magnets, antiferromagnets, non-collinear/non-coplanar spin structure, thin films and nanotechnology, surface and interface physics, single crystal growth, etc. Recently, Professor Higo succeeded in the electrical manipulation and detection of chiral antiferromagnetic order in the topological antiferromagnet Mn3Sn and its device applications, and published many high-quality papers as the first author, including Nature, Nature Photonics, Nature Physics, Nature Communications, Advanced Materials, etc.
Selected Publications
1. Perpendicular full switching of chiral antiferromagnetic order by current, T. Higo†, K. Kondou†, T. Nomoto, M. Shiga, S. Sakamoto, X. Chen, D. Nishio-Hamane, R. Arita, Y. Otani, S. Miwa and S. Nakatsuji, Nature 607, 474–479 (2022).
2. Large magneto-optical Kerr effect and imaging of magnetic octupole domains in an antiferromagnetic metal,
T. Higo, H. Man, D. B. Gopman, Liang Wu, T. Koretsune, O. M. J. van ’t Erve, Y. P. Kabanov, D. Rees, Yufan Li, M.-T. Suzuki, S. Patankar, M. Ikhlas, C. L. Chien, R. Arita, R. D. Shull, J. Orenstein, and S. Nakatsuji, Nature Photonics 12, 73-78 (2018)
3. Octupole-driven magnetoresistance in an antiferromagnetic tunnel junction X. Chen†, T. Higo†, K. Tanaka†, T. Nomoto, H. Tsai, H. Idzuchi, M. Shiga, S. Sakamoto, R. Ando, H. Kosaki, T. Matsuo, D. Nishio-Hamane, R. Arita, S. Miwa, and S. Nakatsuji, Nature 613, 490 (2023)