Effect of Spin Current on Uniform Ferromagnetism: Domain Nucleation
Junya Shibata, Gen Tatara, Hiroshi Kohno
Abstract
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.
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