Intermartensitic Transformation and Enhanced Exchange Bias in Pd (Pt) -doped Ni-Mn-Sn alloys

In this work, we studied the phase transitions and exchange bias of Ni(50−x)Mn(36)Sn(14)T(x) (T = Pd, Pt; x = 0, 1, 2, 3) alloys. An intermartensitic transition (IMT), not observed in Ni(50)Mn(36)Sn(14) alloy, was induced by the proper application of negative chemical pressure by Pd(Pt) doping in Ni...

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Detalles Bibliográficos
Autores principales: Dong, S. Y., Chen, J. Y., Han, Z. D., Fang, Y., Zhang, L., Zhang, C. L., Qian, B., Jiang, X. F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4864378/
https://www.ncbi.nlm.nih.gov/pubmed/27170057
http://dx.doi.org/10.1038/srep25911
Descripción
Sumario:In this work, we studied the phase transitions and exchange bias of Ni(50−x)Mn(36)Sn(14)T(x) (T = Pd, Pt; x = 0, 1, 2, 3) alloys. An intermartensitic transition (IMT), not observed in Ni(50)Mn(36)Sn(14) alloy, was induced by the proper application of negative chemical pressure by Pd(Pt) doping in Ni(50−x)Mn(36)Sn(14)T(x) (T = Pd, Pt) alloys. IMT weakened and was suppressed with the increase of applied field; it also disappeared with further increase of Pd(Pt) content (x = 3 for Pd and x = 2 for Pt). Another striking result is that exchange bias effect, ascribed to the percolating ferromagnetic domains coexisting with spin glass phase, is notably enhanced by nonmagnetic Pd(Pt) addition. The increase of unidirectional anisotropy by the addition of Pd(Pt) impurities with strong spin-orbit coupling was explained by Dzyaloshinsky-Moriya interactions in spin glass phase.

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