Spin Torques in Magnetic Tunnel Junctions

Authored by: Yoshishige Suzuki , Hitoshi Kubota

Spintronics Handbook: Spin Transport and Magnetism, Second Edition

Print publication date:  May  2019
Online publication date:  May  2019

Print ISBN: 9781498769525
eBook ISBN: 9780429423079
Adobe ISBN:

10.1201/9780429423079-15

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Abstract

As discussed in Chapters 7 and 8, Volume 1, an electric current in a magnetic multilayer is spin-polarized and yields a torque exerted on a local spin momentum. Such an electric current-induced spin-torque in magnetic multilayers was first predicted theoretically [1, 2] and subsequently observed experimentally in metallic nanojunctions by excitation of spin waves [3] and spin-­injection magnetization switching (SIMS) [4, 5]. The effect of the spin-torque was also claimed to be observed in a perovskite system [6]. Further, SIMS was also observed in magnetic tunnel junctions (MTJs) with an Al-O barrier [7] and an MgO barrier [8, 9] and in magnetic semiconductor systems [10].

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