Magnetic properties and crystallization kinetics of a Mn-doped FINEMET precursor amorphous alloy

被引：16

作者：

Hsiao, AC ^{[1
]}

McHenry, ME

Laughlin, DE

Tamoria, MR

Harris, VG

机构：

[1] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA

[2] USN, Res Lab, Washington, DC 20375 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2001年 / 37卷 / 04期

基金：

美国国家科学基金会;

关键词：

crystallization kinetics; magnetic anisotropy; magnetization vs. time; Mn-doped FINEMET;

D O I：

10.1109/20.951134

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The kinetics of nanocrystallization of a Mn-doped FINEMET alloy from its amorphous precursor is reported. The alloy studied was of a composition (Fe1-xMnx)(73.5)Nb3CuSi13.5B9 where x = 0.05. X-ray diffraction (XRD) confirmed that alpha -FeSi is the product of primary nanocrystallization. Crystallization kinetics were studied using time-dependent magnetization, M(t), as a measure of the volume fraction crystallized. This data was taken using vibrating sample magnetometry (VSM) and thermal analysis employing differential scanning calorimetry (DSC). Primary crystallization for the Mn-doped FINEMET alloy was found to occur at 505 degreesC, for DSC data taken at a heating rate of 10 degreesC/min. Fits to the Kissinger equation for constant heating transformations yield an activation energy for crystallization of 3.4 eV. VSM measurements of isothermal M(t) show that the maximum volume fraction transformed was reached at 20 min. Measurements of magnetic anisotropy as a function of time probe the structural evolution of the material upon nanocrystallization. Measurements show stress relaxation occurring at 20 minutes at 490 degreesC, coinciding with the maximum volume fraction crystallized.

引用

页码：2236 / 2238

页数：3

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