Spin Torques in Magnetic Tunnel Junctions

Authored by: Yoshishige Suzuki , Hitoshi Kubota

Handbook of Spin Transport and Magnetism

Print publication date:  August  2011
Online publication date:  April  2016

Print ISBN: 9781439803776
eBook ISBN: 9781439803783
Adobe ISBN:

10.1201/b11086-18

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Abstract

As discussed in previous chapters, 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 nano-junctions by excitation of spin waves [3] and spin injection magnetization switching (SIMS) [4,5]. The effects 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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