Emergence of anisotropic Gilbert damping in ultrathin Fe layers on GaAs(001)

被引：92

作者：

Chen, L. ^{[1
]}

Mankovsky, S. ^{[2
]}

Wimmer, S. ^{[2
]}

Schoen, M. A. W. ^{[1
]}

Koerner, H. S. ^{[1
]}

Kronseder, M. ^{[1
]}

Schuh, D. ^{[1
]}

Bougeard, D. ^{[1
]}

Ebert, H. ^{[2
]}

Weiss, D. ^{[1
]}

Back, C. H. ^{[1
]}

机构：

[1] Univ Regensburg, Inst Expt & Appl Phys, Regensburg, Germany

[2] Univ Munich, Dept Chem, Munich, Germany

来源：

NATURE PHYSICS | 2018年 / 14卷 / 05期

关键词：

FERROMAGNETIC-RESONANCE; ROOM-TEMPERATURE; FILMS; METALS;

D O I：

10.1038/s41567-018-0053-8

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

As a fundamental parameter in magnetism, the phenomenological Gilbert damping constant a determines the performance of many spintronic devices. For most magnetic materials, a is treated as an isotropic parameter entering the Landau-Lifshitz-Gilbert equation. However, could the Gilbert damping be anisotropic? Although several theoretical approaches have suggested that anisotropic a could appear in single-crystalline bulk systems, experimental evidence of its existence is scarce. Here, we report the emergence of anisotropic magnetic damping by exploring a quasi-two-dimensional single-crystalline ferromagnetic metal/semiconductor interface-that is, a Fe/GaAs(001) heterojunction. The observed anisotropic damping shows twofold C-2v symmetry, which is expected from the interplay of interfacial Rashba and Dresselhaus spin-orbit interaction, and is manifested by the anisotropic density of states at the Fe/GaAs (001) interface. This discovery of anisotropic damping will enrich the understanding of magnetization relaxation mechanisms and can provide a route towards the search for anisotropic damping at other ferromagnetic metal/semiconductor interfaces.

引用

页码：490 / +

页数：6

共 40 条

[1] Extrinsic contributions to the ferromagnetic resonance response of ultrathin films [J].

Arias, R ;

Mills, DL .

PHYSICAL REVIEW B, 1999, 60 (10) :7395-7409

[2] TEMPERATURE-VARIATION OF FERROMAGNETIC RELAXATION IN 3D TRANSITION-METALS [J].

BHAGAT, SM ;

LUBITZ, P .

PHYSICAL REVIEW B, 1974, 10 (01) :179-185

[3] Scattering theory of Gilbert damping [J].

Brataas, Arne ;

Tserkovnyak, Yaroslav ;

Bauer, Gerrit E. W. .

PHYSICAL REVIEW LETTERS, 2008, 101 (03)

[4] Anisotropic Polar Magneto-Optic Kerr Effect of Ultrathin Fe/GaAs(001) Layers due to Interfacial Spin-Orbit Interaction [J].

Buchner, M. ;

Hoegl, P. ;

Putz, S. ;

Gmitra, M. ;

Guenther, S. ;

Schoen, M. A. W. ;

Kronseder, M. ;

Schuh, D. ;

Bougeard, D. ;

Fabian, J. ;

Back, C. H. .

PHYSICAL REVIEW LETTERS, 2016, 117 (15)

[5] Robust spin-orbit torque and spin-galvanic effect at the Fe/GaAs (001) interface at room temperature [J].

Chen, L. ;

Decker, M. ;

Kronseder, M. ;

Islinger, R. ;

Gmitra, M. ;

Schuh, D. ;

Bougeard, D. ;

Fabian, J. ;

Weiss, D. ;

Back, C. H. .

NATURE COMMUNICATIONS, 2016, 7

[6] Calculating condensed matter properties using the KKR-Green's function method-recent developments and applications [J].

Ebert, H. ;

Koedderitzsch, D. ;

Minar, J. .

REPORTS ON PROGRESS IN PHYSICS, 2011, 74 (09)

[7]

Fang D, 2011, NAT NANOTECHNOL, V6, P413, DOI [10.1038/NNANO.2011.68, 10.1038/nnano.2011.68]

[8] Gilbert damping in conducting ferromagnets. II. Model tests of the torque-correlation formula [J].

Garate, Ion ;

MacDonald, Allan .

PHYSICAL REVIEW B, 2009, 79 (06)

[9] Identification of the dominant precession-damping mechanism in Fe, Co, and Ni by first-principles calculations [J].

Gilmore, K. ;

Idzerda, Y. U. ;

Stiles, M. D. .

PHYSICAL REVIEW LETTERS, 2007, 99 (02)

[10] Anisotropic damping of the magnetization dynamics in Ni, Co, and Fe [J].

Gilmore, Keith ;

Stiles, M. D. ;

Seib, Jonas ;

Steiauf, Daniel ;

Faehnle, Manfred .

PHYSICAL REVIEW B, 2010, 81 (17)

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