ECE Seminar - How to switch magnetism differently?
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Magnetization can be conveniently switched by current and current-induced effective field, which serve as viable approaches for building functional spintronic devices. Meanwhile, how to switch magnetization by different approaches has gained growing interests, which motivates partial efforts from my group.
In this talk, I will give a few exciting examples along this direction. The first example will be the electrical voltage switching of metallic ferrimagnets in Pt/FeTb/Pd trilayers, which is realized by using an ionic liquid technique that injects and extracts proton into ferrimagnets. We will also show the ability to demonstrate zero field voltage switching, together with the prototype voltage-controlled spin memory devices [1]. In the second part, I will briefly show the piezo-switching of ferrimagnets by using hydrostatic pressure in FeDyTb [2]. In the end, I will show the ability to switch antiferromagnets by uniaxial strain in hematite (α-Fe₂O₃)[3].
[1] Yang Chen, et al., Phys. Rev. X 15, 011060 (2025).
[2] Yiqing Dong, et al., In preparation (2026).
[2] Ledong Wang, et al., Under Review (2026).
Key Words: (ferrimagnet, antiferromagnet, ionic liquid gating, piezomagnetism)
Wanjun Jiang is currently a full professor at the Department of Physics, Tsinghua University where his research interests focus primarily on magnetism and magnetic materials. Prior to join Tsinghua, he worked as a postdoc with Prof. Kang L. Wang at UCLA and Dr. Axel Hoffmann at Argonne National Laboratory, respectively. Wanjun received his Ph.D. from the University of Manitoba, Canada. Wanjun received several awards including the Governor General gold medal from Canada, UCLA postdoc award amongst others.