Online Spintronics Seminar #77: Byong Guk Park скачать в хорошем качестве

Online Spintronics Seminar #77: Byong Guk Park

Field-Free Spin-Orbit Torque Switching of Perpendicular Magnetization This online seminar was given on August 27, 2021 by Prof. Byong Guk Park of the Korea Advanced Institute of Science and Technology. Please refer to https://www.spintalks.org for more information about the Online Spintronics Seminar Series. Spin-orbit torque (SOT) arising from spin-orbit coupling has gained much attention because it promises efficient magnetization switching in spintronic devices [1]. It is important for device applications that the SOT switches perpendicular magnetizations without an external magnetic field. In addition to field-free switching, reducing SOT switching current density is another essential requirement for low energy consumption. In this talk, I will discuss two approaches to reducing field-free SOT switching current; first, we demonstrate that all three spin polarizations are exploited in a magnetic trilayer comprising an epitaxial bottom ferromagnet with a tilted magnetic easy-axis, and thereby reduces the field-free SOT switching current [2,3]. Second, we show that the lateral modulation of the Rashba effect in Pt/Co/AlOx structures by using a side gate generates out-of-plane SOT, allowing electrical control of field-free switching of perpendicular magnetization [4,5]. Furthermore, it is found that the field-free switching current density gradually reduces when increasing the gate voltage. [1] J. Ryu, S. Lee, K.-J. Lee, and B.-G. Park, Adv. Mater. 32, 1907148 (2020) [2] S.-h.C. Baek, et al, Nat. Mater. 17, 509 (2018) [3] J. Ryu, et al, unpublished manuscript [4] S.-h.C. Baek, et al, Nat. Electron. 1, 398 (2018) [5] M.-G. Kang, et al, unpublished, preprint at DOI: 10.21203/rs.3.rs-87924/v1