Magnetic-field-induced changes in magnetic shape memory alloys

被引：14

作者：

Entel, P. ^{[1
]}

Gruner, M. E. ^{[1
]}

Adeagbo, W. A. ^{[2
]}

Zayak, A. T. ^{[3
]}

机构：

[1] Univ Duisburg Essen, Dept Phys, D-47048 Duisburg, Germany

[2] Ruhr Univ Bochum, D-44780 Bochum, Germany

[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 481卷 / 1-2 C期

关键词：

magnetic shape memory alloys; phase diagrams; influence of magnetic fields; ab initio calculations;

D O I：

10.1016/j.msea.2007.01.191

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

First-principles calculations have been used to investigate the physical properties of magnetic shape memory alloys. We find that the martensitic instability of the high-temperature cubic phase in X(2)YZ (X = Fe, Co, Ni, Pd; Y = Mn, Fe, Co; Z = Al, Ga, Ge, In, Sn) is strongly influenced by the anomalous change of the electronic density of states during the martensitic transformation. The tetragonal martensitic phase is stabilized by a largely reduced density of Ni-3d states near the Fermi level in the minority-spin channel. The magnetic nature of the materials allows for manipulation of the material properties by external magnetic fields. The calculations show that sufficiently large fields can suppress the martensitic transformation in the magnetic shape memory alloy Ni2MnIn. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：258 / 261

页数：4

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