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

被引：22

作者：

Mariager, S. O. ^{[1
]}

Dornes, C. ^{[2
]}

Johnson, J. A. ^{[1
]}

Ferrer, A. ^{[2
]}

Gruebel, S. ^{[1
]}

Huber, T. ^{[2
]}

Caviezel, A. ^{[1
]}

Johnson, S. L. ^{[2
]}

Eichhorn, T. ^{[3
]}

Jakob, G. ^{[3
]}

Elmers, H. J. ^{[3
]}

Beaud, P. ^{[1
]}

Quitmann, C. ^{[1
,4
]}

Ingold, G. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] ETH, Inst Quantum Elect, CH-8093 Zurich, Switzerland

[3] Johannes Gutenberg Univ Mainz, Inst Phys, D-5128 Mainz, Germany

[4] Lund Univ, MAX Lab 4, S-22100 Lund, Sweden

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 16期

关键词：

NI-MN-GA; FIELD-INDUCED STRAIN; MARTENSITIC PHASE; CRYSTAL-STRUCTURE; HEUSLER ALLOYS; FILMS;

D O I：

10.1103/PhysRevB.90.161103

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：5

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