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Structural and magnetic dynamics in the magnetic shape-memory alloy Ni2MnGa

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Author

  • S. O. Mariager
  • C. Dornes
  • J. A. Johnson
  • A. Ferrer
  • S. Gruebel
  • T. Huber
  • A. Caviezel
  • S. L. Johnson
  • T. Eichhorn
  • G. Jakob
  • H. J. Elmers
  • P. Beaud
  • Christoph Quitmann
  • G. Ingold
Show all

Summary, in English

Magnetic shape-memory Heusler alloys are multiferroics stabilized by the correlations between electronic, magnetic, and structural order. To study these correlations we use time-resolved x-ray diffraction and magneto-optical Kerr effect experiments to measure the laser induced dynamics in a Heusler alloy Ni2MnGa film and reveal a set of time scales intrinsic to the system. We observe a coherent phonon which we identify as the amplitudon of the modulated structure and an ultrafast phase transition leading to a quenching of the incommensurate modulation within 300 fs with a recovery time of a few ps. The thermally driven martensitic transition to the high temperature cubic phase proceeds via nucleation within a few ps and domain growth limited by the speed of sound. The demagnetization time is 320 fs, which is comparable to the quenching of the structural modulation.

Department/s

Publishing year

2014

Language

English

Publication/Series

Physical Review B (Condensed Matter and Materials Physics)

Volume

90

Issue

16

Document type

Journal article

Publisher

American Physical Society

Topic

  • Natural Sciences
  • Physical Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 1098-0121