Ab initio modeling of martensitic transformations (MT) in magnetic shape memory alloys

被引：9

作者：

Entel, P. ^{[1
]}

Gruner, M. E.

Adeagbo, W. A.

Eklund, C.-J.

Zayak, A. T.

Akai, H.

Acet, M.

机构：

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

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

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

[4] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 310卷 / 02期

关键词：

ferromagnetic Heusler alloy; martensitic transformation; first-principles calculation;

D O I：

10.1016/j.jmmm.2006.10.1114

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic field-induced (MFI) changes of the electronic, magnetic and phonon properties of magnetic shape memory Heusler alloys Ni-Mn-Ga and Ni-Mn-In are discussed on the basis of first-principles calculations. Without an external magnetic field, the lattice instability to shear wave propagation in [110] direction shows up in the calculation as softening of the TA(2) zeta [110] (d2/a) mode at z approximate to 1/3. The ab initio modeling of magnetic. field effects shows that the phase (austenite or martensite) is favored which has larger magnetization. This is in agreement with experiments on Ni-Mn-In, for which the martensitic transformation (MT) can be shifted by 40K to lower temperatures in an external field of 5 T. (C) 2006 Elsevier B. V. All rights reserved.

引用

页码：2761 / 2763

页数：3

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