Magnetoresistance in ferromagnetic shape memory alloy NiMnFeGa

Z. H. Liu, X. Q. Ma, Zhiyong Zhu, H. Z. Luo, G. D. Liu, J. L. Chen, G. H. Wu, Xiaokai Zhang, John Q. Xiao

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The magnetoresistance (MR){=[R(H)-R(0)]/R(0)} properties in ferromagnetic shape memory alloy of NiMnFeGa ribbons and single crystals, and NiFeGa ribbons have been investigated. It is found that the NiMnFeGa melt-spun ribbon exhibited GMR effect, arising from the spin-dependent scattering from magnetic inhomogeneities consisting of antiferromagnetically coupled Mn atoms in B2 structure. In the absence of these magnetic inhomogeneities, Heusler alloys seem to show a common linear MR behavior at around 0.8TC, regardless of sample structures. This may be explained by the sd model. At low temperatures, conventional AMR behaviors due to the spinorbital coupling are observed. This is most likely due to the diminished MR from sd model because of much less spin fluctuation, and is not associated with martensite phase. MR anomaly at intermediate field (ρ||) is also observed in single crystal samples, which may be related to unique features of Heusler alloys.

Original languageEnglish (US)
Pages (from-to)2192-2195
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume323
Issue number16
DOIs
StatePublished - Aug 1 2011

Keywords

  • Ferromagnetic shape memory alloys
  • Heusler alloys
  • Magnetoresistance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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