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arXiv · 1811.09369

Self-stabilizing exchange-mediated spin transport

T. Schneider·D. Hill·A. Kákay·K. Lenz·J. Lindner·J. Fassbender·P. Upadhyaya·Yuxiang Liu·Kang Wang·Y. Tserkovnyak·I. N. Krivorotov·I. Barsukov
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Abstract

Long-range spin transport in magnetic systems can be achieved by means of exchange-mediated spin textures with robust topological winding -- a phenomenon referred to as spin superfluidity. Its experimental signatures have been discussed in antiferromagnets which are nearly free of dipolar interaction. However, in ferromagnets, which possess non-negligible dipole fields, realization of such spin transport has remained a challenge. Using micromagnetic simulations, we investigate coherent exchange-mediated spin transport in extended thin ferromagnetic films. We uncover a two-fluid state, in which the long-range spin transport by spin textures co-exists with spin waves, as well as a soliton-screened spin transport regime at high spin injection biases. Both states are associated with distinct spin texture reconstructions near the spin injection region and sustain spin transport over large distances.

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T. Schneider, D. Hill, A. Kákay, K. Lenz, J. Lindner, J. Fassbender, P. Upadhyaya, Yuxiang Liu, Kang Wang, Y. Tserkovnyak, I. N. Krivorotov, I. Barsukov. 2018-11-23. Self-stabilizing exchange-mediated spin transport. https://doi.org/10.1103/physrevb.103.144412

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