Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session M35: Novel Functional Magnetic Materials and Structures
11:15 AM–2:03 PM,
Wednesday, March 4, 2020
Room: 507
Sponsoring
Unit:
GMAG
Chair: Shinji Miwa, Univ of Tokyo
Abstract: M35.00008 : The Voltage-Controlled Magnetic Anisotropy Effect Under High Electric Field*
Presenter:
Bowei Zhou
(Univ of Arizona)
Authors:
Bowei Zhou
(Univ of Arizona)
Meng Xu
(Univ of Arizona)
Pravin Khanal
(Univ of Arizona)
Yu Zhang
(Univ of Arizona)
Weigang Wang
(Univ of Arizona)
Modified TMR method is performed in this work. By using pulsed voltage, on-time can be reduced by at least 2 orders of magnitude, which increases the MTJ breakdown voltage and allows for higher E-field (>800mV/nm). Unexpected magnetoresistance independent of relative FM spin alignment was discovered and attributed to impurity-assisted tunneling. Efforts were made to exclude it from conventional TMR and a nonlinear E-field dependence of PMA can be observed under high bias. Electron doping with different metals as buffer and insertion is carried out and their influence is reported and compared with DFT study.
1. J. Zhang, P. V. Lukashev, S. S. Jaswal, and E. Y. Tsymbal, Phys. Rev. B 96, 014435 (2017).
*This work is supported by NSF ECCS Grant No. 1554011 and the DARPA ERI program (FRANC).
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