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Current-induced Vortex Motion by Spin-Transfer Torque

Junya Shibata·Yoshinobu Nakatani·Gen Tatara·Hiroshi Kohno·Yoshichika Otani
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Abstract

We investigate the dynamics of a magnetic vortex driven by spin-transfer torque due to spin current in the adiabatic case. The vortex core represented by collective coordinate experiences a transverse force proportional to the product of spin current and gyrovector, which can be interpreted as the geometric force determined by topological charges. We show that this force is just a reaction force of Lorentz-type force from the spin current of conduction electrons. Based on our analyses, we propose analytically and numerically a possible experiment to check the vortex displacement by spin current in the case of single magnetic nanodot.

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Junya Shibata, Yoshinobu Nakatani, Gen Tatara, Hiroshi Kohno, Yoshichika Otani. 2005-08-25. Current-induced Vortex Motion by Spin-Transfer Torque. https://doi.org/10.1103/physrevb.73.020403

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