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Magnetic field dependent effects on the structural stability of MSM Heusler alloys

Markus E. Gruner 1Waheed A. Adeagbo 2Alexey T. Zayak 3Alfred Hucht 1Peter Entel 1

1. University of Duisburg Essen, Campus Duisburg, Department of Theoretical Physics, Lotharstrasse 1, Duisburg 47048, Germany
2. Ruhr-University Bochum, Universitaetsstrasse 150, Bochum 44801, Germany
3. University of Texas at Austin (UT Austin), University Code C0400, Austin, TX 78712, United States


In magnetic shape memory (MSM) Heusler alloys as Ni2MnGa strains of up to 10% can be induced by external magnetic fields, making the material a technologically relevant candidate
for magneto-mechanical actuators. Magnetic field induced strains are either produced
by the field-induced motion of martensitic twin boundaries (as in Ni2MnGa) by shifting the martensitic transformation temperture in a magnetic field (as in Ni2MnIn).
We present calculations of magentic field-dependent properties of MSM Heusler alloys by means of density functional theory calculations. The effects of a an external magnetic field on structural properties are simulated by fixing the magnetic moments within the framework of the fixed spin moment (FSM) method. We investigate the phase stability of MSM Heusler materials by investigating phonon dispersions at different magnetizations and relate this
to nesting features of the respective Fermi surfaces.


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Presentation: Oral at E-MRS Fall Meeting 2007, Symposium E, by Markus E. Gruner
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-21 12:08
Revised:   2009-06-07 00:44