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

Mariager, S. O.; Dornes, C.; Johnson, J. A.; Ferrer, A.; Gruebel, S.; Huber, T.; Caviezel, A.; Johnson, S. L.; Eichhorn, T. and Jakob, G., et al. (2014) In Physical Review B (Condensed Matter and Materials Physics) 90(16).
Abstract
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... (More)
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. (Less)
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Contribution to journal
publication status
published
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Physical Review B (Condensed Matter and Materials Physics)
volume
90
issue
16
publisher
American Physical Society
external identifiers
  • wos:000344020400001
  • scopus:84908031960
ISSN
1098-0121
DOI
10.1103/PhysRevB.90.161103
language
English
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yes
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74662bba-918f-47a6-bc39-c81e301f6ee7 (old id 4875650)
date added to LUP
2014-12-30 10:47:29
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2017-03-12 03:47:11
@article{74662bba-918f-47a6-bc39-c81e301f6ee7,
  abstract     = {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.},
  articleno    = {161103},
  author       = {Mariager, S. O. and Dornes, C. and Johnson, J. A. and Ferrer, A. and Gruebel, S. and Huber, T. and Caviezel, A. and Johnson, S. L. and Eichhorn, T. and Jakob, G. and Elmers, H. J. and Beaud, P. and Quitmann, Christoph and Ingold, G.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {16},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Structural and magnetic dynamics in the magnetic shape-memory alloy Ni2MnGa},
  url          = {http://dx.doi.org/10.1103/PhysRevB.90.161103},
  volume       = {90},
  year         = {2014},
}