title: Angular and temperature dependence of current induced spin-orbit effective fields in Ta/CoFeB/MgO nanowires.
abstract: Current induced spin-orbit effective magnetic fields in metal/ferromagnet/oxide trilayers provide a new way to manipulate the magnetization, which is an alternative to the conventional current induced spin transfer torque arising from noncollinear magnetization. Ta/CoFeB/MgO structures are expected to be useful for non-volatile memories and logic devices due to its perpendicular anisotropy and large current induced spin-orbit effective fields. However many aspects such as the angular and temperature dependent phenomena of the effective fields are little understood. Here, we evaluate the angular and temperature dependence of the current-induced spin-orbit effective fields considering contributions from both the anomalous and planar Hall effects. The longitudinal and transverse components of effective fields are found to have strong angular dependence on the magnetization direction at 300 K. The transverse field decreases significantly with decreasing temperature, whereas the longitudinal field shows weaker temperature dependence. Our results reveal important features and provide an opportunity for a more comprehensive understanding of current induced spin-orbit effective fields.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Xuepeng
authors.initials: X
authors.lastname: Qiu
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Praveen
authors.initials: P
authors.lastname: Deorani
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Kulothungasagaran
authors.initials: K
authors.lastname: Narayanapillai
authors.affiliation: 1] Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea [2] Spin Convergence Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea.
authors.forename: Ki-Seung
authors.initials: KS
authors.lastname: Lee
authors.affiliation: 1] Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea [2] Spin Convergence Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea [3] KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 136-713, Korea.
authors.forename: Kyung-Jin
authors.initials: KJ
authors.lastname: Lee
authors.affiliation: PCTP and Department of Physics, Pohang University of Science and Technology, Kyungbuk 790-784, Korea.
authors.forename: Hyun-Woo
authors.initials: HW
authors.lastname: Lee
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Hyunsoo
authors.initials: H
authors.lastname: Yang