Dominant factor of zero-field-cooled magnetization in discontinuous Fe films

Shiratsuchi, Yu; Yamamoto, Masahiko

Physical Review B - Condensed Matter and Materials Physics, 2007, 76(14), 144432

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Identifier to cite or link to this item: https://hdl.handle.net/11094/89984

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Title
Dominant factor of zero-field-cooled magnetization in discontinuous Fe films
Creator
NRID
1000070379121 1000070379121
ORCID
0000-0002-8938-4869 0000-0002-8938-4869
researchmap permalink
read0090304 read0090304
Scopus Author ID
6602197167 6602197167
CreatorName
Shiratsuchi, Yu
NRID
1000030029160 1000030029160
CreatorName
Yamamoto, Masahiko
Description
Y.Shiratsuchi, M.Yamamoto, Dominant factor of zero-field-cooled magnetization in discontinuous Fe films. Physical Review B - Condensed Matter and Materials Physics 76, 144432 (2007); https://doi.org/10.1103/PhysRevB.76.144432.
Abstract
The zero-field-cooled (ZFC) magnetization under the various field and temperature conditions has been investigated using the discontinuous Fe films. Among the various factors influencing the ZFC magnetization, it is found that either the thermal relaxation or the Langevin behavior dominates the ZFC magnetization, depending on the energy barrier distribution which is altered by the growth temperature. The peak temperature of ZFC magnetization follows the Néel-Brown model for the narrower energy barrier distribution. With broadening the energy barrier distribution for the higher growth temperature, the Langevin behavior of thermally fluctuated particles becomes dominant. The change of energy barrier distribution, namely, the dominant factor of ZFC magnetization, is explained by the broadening of size distribution and the degradation of crystallinity with increasing growth temperature. For both cases, we estimate the superparamagnetic blocking temperature TB and obtain the effective magnetic anisotropy and the effective volume from the field dependence of TB. From the obtained values, we show the presence of interparticle interaction for the Fe grown at 323 K, and discuss the effective magnetic anisotropy of randomly oriented particles grown above 573 K.
Publisher
American Physical Society
Source Title
Physical Review B - Condensed Matter and Materials Physics
Volume (Issue)
76(14)
Page
144432
Date of Issued
2007-10-29
Language
English
Handle URL
https://hdl.handle.net/11094/89984
PISSN
10980121
eISSN
1550235X
NCID
AA11187113
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1103/PhysRevB.76.144432
Access Rights
open access
CopyRight
Copyright 2007 by the American Physical Society
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Version of Record
Category
学術雑誌論文 Journal Article