High-temperature superparamagnetism in boron substituted Fe-Zr-Mn alloys

A magnetization and electron spin resonance study of amorphous Fe/sub 82/Mn/sub 8-x/B/sub x/Zr/sub 10/ (x=6,8) ribbons is presented and discussed. Curie temperature of an amorphous matrix increased with x and equaled 302 K and 368 K for x=6 and x=8 alloys, respectively. A single resonance peak in fe...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2005-10, Vol.41 (10), p.3265-3267
Main Authors: Ulyanov, A.N., Seong-Cho Yu, Young-Min Kang, Sang-Im Yoo
Format: Article
Language:English
Subjects:
Amorphous magnetic materials
Amorphous materials
Boron alloys
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Iron
Magnetic resonance
Magnetism
Magnetization
Materials science
Matrices
Other topics in materials science
Paramagnetic materials
Paramagnetic resonance
Physics
Temperature
Zirconium
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Summary:A magnetization and electron spin resonance study of amorphous Fe/sub 82/Mn/sub 8-x/B/sub x/Zr/sub 10/ (x=6,8) ribbons is presented and discussed. Curie temperature of an amorphous matrix increased with x and equaled 302 K and 368 K for x=6 and x=8 alloys, respectively. A single resonance peak in ferromagnetic resonance (FMR) spectra was observed below Curie temperature, T/sub C/, and at least two distinct resonance lines were well observed at temperatures higher than T/sub C/. The low and high field-resonance lines were attributed to the paramagnetic state of the amorphous matrix and superparamagnetic states of nanoparticles embedded into the matrix, respectively. These observations could be qualitatively understood in terms of a finite-spin cluster plus an infinite ferromagnetic matrix model.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2005.854899