Shape-anisotropic heterogeneous nucleation and magnetic Gibbs-Thomson effect in itinerant-electron metamagnetic transition of La(Fe0.88Si0.12)13 magnetocaloric compound

被引：18
|
作者：
Fujita, A. [1 ]
Kondo, T. [1 ]
Kano, M. [1 ]
Yako, H. [1 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan
来源：
APPLIED PHYSICS LETTERS | 2013年 / 102卷 / 04期
基金：
日本学术振兴会;
关键词：
ENTROPY CHANGE; KINETICS;
D O I：
10.1063/1.4789902
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Macroscopic anisotropy of spatial selectivity in magnetic nucleation and growth was clarified for itinerant-electron metamagnetic transition of La(Fe0.88Si0.12)(13) by the time-dependent Ginzburg-Landau model combined with the Maxwell electromagnetic equation. Spontaneous generation of voltage supports symmetric growth in the longitudinal direction of the specimen as predicted by the simulation. The difference between nucleation-growth behaviors in thermally induced transition and those in field-induced transition is also elucidated. Electrical resistivity measurements also detect anisotropic growth of the induced phase. These results imply that the magnetic-dipole version of Gibbs-Thomson effect governs growth behavior. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4789902]
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页数：5
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