Effect of Spin Current on Uniform Ferromagnetism: Domain Nucleation

Junya Shibata, Gen Tatara, Hiroshi Kohno

Published 2004-07-06, updated 2005-01-06Version 2

Large spin current applied to a uniform ferromagnet leads to a spin-wave instability as pointed out recently. In this paper, it is shown that such spin-wave instability is absent in a state containing a domain wall, which indicates that nucleation of magnetic domains occurs above a certain critical spin current. This scenario is supported also by an explicit energy comparison of the two states under spin current.