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Characteristics of the Domain Wall Structure and Domain Wall Damping
Resource
CHINESE JOURNAL OF PHYSICS, VOL. 35, NO. 4
Journal
CHINESE JOURNAL OF PHYSICS
Journal Volume
VOL. 35
Journal Issue
NO. 4
Pages
-
Date Issued
1997-08
Date
1997-08
Author(s)
Huang, Huei-Li
DOI
20060927120000179881
Abstract
The coordinate and transverse field dependence of the domain wall (DW) magnetization
structure across the wall proper and the corresponding dependence of the
effective DW width of both the polar and azimuthal angle distribution has been investigated.
The effective width of the azimuthal angle distribution is found to vary
with the orientation and strength of the transverse field and is much broader than the
conventional wall width due to the polar angle distribution. On dynamics, the analysis
of the DW motion in the presence of the transverse field normal to the anisotropy axis
taking into account the nonconservation of the magnetization modulus has uncovered
two types of the magnetization damping parameters. One is that of the Landau-Lifihitz
damping constant, XPMR, which characterizes the homogeneous magnetization manifested
in the ferromagnetic resonance line width. The other, X,, is associated with
the inhomogeneous magnetization such as the DW which gives rise to an extra viscous
damping. Numerically, X, can be of the same order or several factors greater
than XPMR. Our formulation establishes the existence of two distinctly different damping
processes associated with a ferromagnet sample which the Landau-Lifshitz-Gilbert
equation fails inherently.
structure across the wall proper and the corresponding dependence of the
effective DW width of both the polar and azimuthal angle distribution has been investigated.
The effective width of the azimuthal angle distribution is found to vary
with the orientation and strength of the transverse field and is much broader than the
conventional wall width due to the polar angle distribution. On dynamics, the analysis
of the DW motion in the presence of the transverse field normal to the anisotropy axis
taking into account the nonconservation of the magnetization modulus has uncovered
two types of the magnetization damping parameters. One is that of the Landau-Lifihitz
damping constant, XPMR, which characterizes the homogeneous magnetization manifested
in the ferromagnetic resonance line width. The other, X,, is associated with
the inhomogeneous magnetization such as the DW which gives rise to an extra viscous
damping. Numerically, X, can be of the same order or several factors greater
than XPMR. Our formulation establishes the existence of two distinctly different damping
processes associated with a ferromagnet sample which the Landau-Lifshitz-Gilbert
equation fails inherently.
Publisher
臺北市:國立臺灣大學物理系所
Type
journal article
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