Study of the perpendicular magnetic anisotropy, spin-orbit torque, and Dzyaloshinskii-Moriya interaction in the heavy metal/CoFeB bilayers with Ir22Mn78insertion

Congli He, Seyed Armin Razavi, Guoqiang Yu, Xin Ma, Hao Wu, Qiming Shao, Kin L. Wong, Shipeng Shen, Yunchi Zhao, Yusen Pei, Qingqiang Chen, Xiaoqin Li, Shouguo Wang, Kang L. Wang

Research output: Contribution to journalArticlepeer-review

Abstract

The perpendicular magnetic anisotropy (PMA), current-induced spin-orbit torques (SOTs), and Dzyaloshinskii-Moriya interaction (DMI) in the as-grown W or Ta/Ir22Mn78(IrMn)/CoFeB/MgO stacks with varying IrMn layer thicknesses were investigated. The in-plane magnetized W/CoFeB/MgO sample becomes perpendicularly magnetized after inserting the IrMn layer without the requirement of the annealing process. The effective magnetization fields 4πMeff show a nonmonotonic dependence on the IrMn layer thickness, which reaches the maximum in magnitude at a thickness of tIrMn = 0.75 nm. The SOT effective fields corresponding to damping-like and field-like torques decrease with the insertion layer thickness. Moreover, the variation of the IrMn layer thickness leads to the change of the DMI in magnitude and sign change from positive (favoring right-handed chirality) to negative (favoring left-handed chirality). The realization of changing the PMA, SOTs, and DMI by inserting the IrMn layer provides more flexibility in the design of spintronic devices.

Original languageEnglish
Article number242407
JournalApplied Physics Letters
Volume116
Issue number24
DOIs
Publication statusPublished - 2020 Jun 15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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