First-principles calculations of spin spirals in Ni2MnGa and Ni2MnAl
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© 2003 American Physical Society (APS). This is the accepted version of the following article: Enkovaara, J. & Ayuela, A. & Jalkanen, J. & Nordström, L. & Nieminen, Risto M. 2003. First-principles calculations of spin spirals in Ni2MnGa and Ni2MnAl. Physical Review B. Volume 67, Issue 5. 054417/1-7. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.67.054417, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.67.054417.
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2003
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Language
en
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054417/1-7
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Physical Review B, Volume 67, Issue 5
Abstract
We report here noncollinear magnetic configurations in the Heusler alloys Ni2MnGa and Ni2MnAl which are interesting in the context of the magnetic shape memory effect. The total energies for different spin spirals are calculated and the ground-state magnetic structures are identified. The calculated dispersion curves are used to estimate the Curie temperature which is found to be in good agreement with experiments. In addition, the variation of the magnetic moment as a function of the spiral structure is studied. Most of the variation is associated with Ni, and symmetry constraints relevant for the magnetization are identified. Based on the calculated results, the effect of the constituent atoms in determining the Curie temperature is discussed.Description
Keywords
Heusler alloys, magnetic configurations, spin spirals
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Citation
Enkovaara, J. & Ayuela, A. & Jalkanen, J. & Nordström, L. & Nieminen, Risto M. 2003. First-principles calculations of spin spirals in Ni2MnGa and Ni2MnAl. Physical Review B. Volume 67, Issue 5. 054417/1-7. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.67.054417.