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Effect of Pt substitution on the magnetocrystalline anisotropy of Ni2MnGa: A competition between chemistry and elasticity

MPS-Authors
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Caron,  Luana
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Dutta,  Biswanath
Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Devi,  Parul
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ghorbani-Zavareh,  Mahdiyeh
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hickel,  Tilmann
Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Singh,  Sanjay
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Caron, L., Dutta, B., Devi, P., Ghorbani-Zavareh, M., Hickel, T., Cabassi, R., et al. (2017). Effect of Pt substitution on the magnetocrystalline anisotropy of Ni2MnGa: A competition between chemistry and elasticity. Physical Review B, 96(5): 054105, pp. 1-6. doi:10.1103/PhysRevB.96.054105.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002E-8D22-6
Abstract
The magnetocrystalline anisotropy (MAE) of Ni2- x Pt-x MnGa(0 <= x <= 0.25) alloys are investigated using the singular point detection technique and density functional theory. A slight reduction in MAE as compared to that of Ni2MnGa is observed due to Pt substitution. The calculated MAE varies almost linearly with the orbital moment anisotropy. A competition between the elastic and the chemical contributions explains the observed trend of the MAE with increasing Pt content. The large MAE in combination with the previously reported increase of the martensitic transition temperature makes these alloys promising candidates for ferromagnetic shape memory applications near room temperature.