Abstract
We investigate the motion of a domain wall in the presence of a dynamical hyperfine field. At temperature T high compared to the hyperfine coupling, the nuclear spins create a spatially random potential landscape, with dynamics dictated by the nuclear relaxation time T 2. The distribution of the domain wall relaxation times (both in the thermal and quantum regimes) can show a long tail, characteristic of stochastic processes where rare events are important. Here, these are due to occasional strong fluctuations in the nuclear spin polarisation.
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Dubé, M., Stamp, P.C.E. Domain Wall Motion in the Presence of Nuclear Spins. Journal of Low Temperature Physics 113, 1085–1090 (1998). https://doi.org/10.1023/A:1022576922410
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DOI: https://doi.org/10.1023/A:1022576922410