Joule Heating Effect on Field-Free Magnetization Switching by Spin-Orbit Torque in Exchange-Biased Systems

  • Authors:
    Seyed Armin Razavi (UCLA), Guoqiang Yu (UCLA), Kang L. Wang (UCLA), Di Wu (UCLA), Kin Wong (UCLA), Yong-Chong Lau (Trinity College), Weihua Zhu (Fudan Univ.), Congli He (UCLA), Zongzhi Zhang (Fudan Univ.), J.M.D. Coey (Trinity College), Plamen Stamenov (Trinity College), Pedram Khalil Amiri (UCLA)
    Publication ID:
    P090768
    Publication Type:
    Paper
    Received Date:
    28-Apr-2017
    Last Edit Date:
    1-May-2017
    Research:
    2381.004 (University of Minnesota)

Abstract

Switching of magnetization via spin-orbit torque provides an efficient alternative for nonvolatile memory and logic devices. However, to achieve deterministic switching of perpendicular magnetization, an external magnetic field collinear with the current is usually required, which makes these devices inappropriate for practical applications. In this work, we examine the current-induced magnetization switching in a perpendicularly magnetized exchange-biased Pt=CoFe=IrMn system. A magnetic field annealing technique is used to introduce in-plane exchange biases, which are quantitatively characterized. Under proper conditions, field-free current-driven switching is achieved. We study the Joule heating effect, and we show how it can decrease the in-plane exchange bias and degrade the field-free switching. Furthermore, we discuss that the exchange-bias training effect can have similar effects.

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