Unraveling magneto-structural coupling of Ni2MnGa alloy under the application of stress and magnetic field using in situ polarized neutron diffraction

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Y. B. Ke
  • S. Lan
  • Y. Wu
  • H. H. Wu
  • V. Hutanu
  • H. Deng

Detail(s)

Original languageEnglish
Article number081905
Journal / PublicationApplied Physics Letters
Volume117
Issue number8
Online published27 Aug 2020
Publication statusPublished - Aug 2020

Abstract

The magneto-structural evolution of a Ni2MnGa single crystal was investigated by in situ polarized neutron diffraction under both magnetic field and mechanical loading. The ability to separate the nuclear and magnetic scatterings by polarized neutrons enables simultaneous observations of the twin reorientation (through twin boundary motion) and magnetic moment configuration. It is found that under a 1.0 T saturating magnetic field, twin reorientation can be activated by compressive stress and is accompanied by a realignment of the magnetic moment, which follows the easy axis of the twin variant. On the other hand, compressive stress as small as 1.0 MPa can freeze the twin reorientation. The evolution of the magnetic scattering amplitudes suggests that the change in magnetization was mainly achieved through the magnetic domain wall motion, while the twin boundary motion was blocked.

Research Area(s)

  • GA, DIFFRACTOMETER, DEFORMATION, POLI

Citation Format(s)

Unraveling magneto-structural coupling of Ni2MnGa alloy under the application of stress and magnetic field using in situ polarized neutron diffraction. / Ke, Y. B.; Lan, S.; Wu, Y.; Wu, H. H.; Hutanu, V.; Deng, H.; Pramanick, A.; Ren, Y.; Wang, X-L.

In: Applied Physics Letters, Vol. 117, No. 8, 081905, 08.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review