title: Effect of spin current on uniform ferromagnetism: domain nucleation.
abstract: A large spin current applied to a uniform ferromagnet leads to a spin-wave instability as pointed out recently. In this Letter, 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.
authors.affiliation: Frontier Research System (FRS), The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Junya
authors.initials: J
authors.lastname: Shibata
authors.forename: Gen
authors.initials: G
authors.lastname: Tatara
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kohno