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Effect of Spin Current on Uniform Ferromagnetism Domain Nucleation
Accepted for publication in Physical Review Letters.
Effect of Spin Current on Uniform Ferromagnetism: Domain Nucleation
Junya Shibata
Frontier Research System (FRS), The Institute of Physical and Chemical
Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
5 CREST, JST, 4-1-8 Honcho Kawaguchi, Saitama, Japan
0
0
2 Gen Tatara
PRESTO, JST, 4-1-8 Honcho Kawaguchi, Saitama, Japan
n Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
a
J
Hiroshi Kohno
6
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
] (Dated: February 2, 2008)
l
l
a Large spin current applied to a uniform ferromagnet leads to a spin-wave instability as pointed
h 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
s spin current. This scenario is supported also by an explicit energy comparison of the two states
e
m under spin current.
t. PACS numbers: 72.25.Ba, 75.40.Gb
a
m
Magnetization dynamics driven by spin torque from a term as the “Doppler shift” [10], where v (∝ j ) rep-
-
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