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arXiv · 1612.00194

Field- and damping-like spin-transfer torque in magnetic multilayers

Claas Abert·Hossein Sepehri-Amin·Florian Bruckner·Christoph Vogler·Masamitsu Hayashi·Dieter Suess
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Abstract

We investigate the spin-transfer torque in a magnetic multilayer structure by means of a spin-diffusion model. The torque in the considered system, consisting of two magnetic layers separated by a conducting layer, is caused by a perpendicular-to-plane current. We compute the strength of the field-like and the damping-like torque for different material parameters and geometries. Our studies suggest that the field-like torque highly depends on the exchange coupling strength of the itinerant electrons with the magnetization both in the pinned and the free layer. While a low coupling leads to very high field-like torques, a high coupling leads to low or even negative field-like torques. The dependence of the different torque terms on system parameters is considered very important for the development of applications such as STT MRAM and spin-torque oscillators.

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Claas Abert, Hossein Sepehri-Amin, Florian Bruckner, Christoph Vogler, Masamitsu Hayashi, Dieter Suess. 2016-12-01. Field- and damping-like spin-transfer torque in magnetic multilayers. https://doi.org/10.1103/physrevapplied.7.054007

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