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Composition-Dependent Crystal Structure and Magnetism in Nanocrystalline Co-Rich Alloy

Authors
Chun, B. S.Cho, J. U.Kim, S. D.Kim, Y. S.Hwang, J. Y.Kim, S. S.Rhee, J. R.Kim, T. W.Hong, J. P.Jung, M. H.Kim, Y. K.
Issue Date
Oct-2009
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Co-alloy; nanocrystalline; negative remanence
Citation
IEEE TRANSACTIONS ON MAGNETICS, v.45, no.10, pp 3862 - 3864
Pages
3
Journal Title
IEEE TRANSACTIONS ON MAGNETICS
Volume
45
Number
10
Start Page
3862
End Page
3864
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/13681
DOI
10.1109/TMAG.2009.2024540
ISSN
0018-9464
1941-0069
Abstract
We report the magnetism of a ferromagnetic two phase mixture system by investigating the microstructural evolution and relevant property changes as a function of alloy composition in CoFeSiB film. The crystal structure evolved from an amorphous to hcp Co nanocrystal embedded two-phase mixture when Co concentration exceeded the critical amount (similar to 75 at.%) confirmed through TEM and XRD. Very low coercivity value was observed in the amorphous samples. The soft magnetic properties are due to the fact that the magnetic moments of Co-rich phase are exchange-coupled via the amorphous matrix, as a consequence the magnetic anisotropies are averaged out in the amorphous system. Meanwhile, beyond 75 at.% of Co, an abrupt increase in coercivity was observed in the nanocrystalline samples where highly anisotropic Co nanocrystals were precipitated. The hard magnetic properties resulted from the magnetic decoupling (breaking of the nanocrystal-amorphous matrix-nanocrystal coupling chain) because the exchange forces are not able to overcome the magnetocrystaline anisotropy. We also found that antiferromagnetic exchange coupling existed at the nanocrystal-amorphous matrix interfaces.
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