Magnetic domain walls displacement : automotion vs. spin-transfer torque

Details Magnetic domain walls displacement : automotion vs. spin-transfer torque Magnetic domain walls displacement : automotion vs. spin-transfer torque

2010-07-29

arxiv.org/abs/1007.5233v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The magnetization dynamics equation predicts that a domain wall that changes structure should undergo a displacement by itself - automotion - due to the relaxation of the linear momentum that is associated with the wall structure. We experimentally demonstrate this effect in soft nanostrips,transforming under spin transfer torque a metastable asymmetric transverse wall into a vortex wall. Displacements more than three times as large as under spin transfer torque only are measured for 1~ns pulses. The results are explained by analytical and numerical micromagnetics. Their relevance to domain wall motion under spin transfer torque is emphasized.

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