Tunable damping, saturation magnetization, and exchange stiffness of half-Heusler NiMnSb thin films

被引：53

作者：

Durrenfeld, P. ^{[1
]}

Gerhard, F. ^{[2
]}

Chico, J. ^{[3
]}

Dumas, R. K. ^{[1
,4
]}

Ranjbar, M. ^{[1
]}

Bergman, A. ^{[3
]}

Bergqvist, L. ^{[5
,6
]}

Delin, A. ^{[3
,5
,6
]}

Gould, C. ^{[2
]}

Molenkamp, L. W. ^{[2
]}

Akerman, J. ^{[1
,4
,5
]}

机构：

[1] Gothenburg Univ, Dept Phys, S-41296 Gothenburg, Sweden

[2] Univ Wurzburg, Phys Inst EP3, D-97074 Wurzburg, Germany

[3] Uppsala Univ, Dept Phys & Astron, S-75220 Uppsala, Sweden

[4] NanOsc AB, S-16440 Kista, Sweden

[5] KTH Royal Inst Technol, Mat & Nano Phys, Sch ICT, S-16440 Kista, Sweden

[6] Swedish e Sci Res Ctr SeRC, S-10044 Stockholm, Sweden

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 21期

基金：

瑞典研究理事会;

关键词：

OSCILLATOR DRIVEN; SPIN POLARIZATION; ALLOY NIMNSB; METALS;

D O I：

10.1103/PhysRevB.92.214424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The half-metallic half-Heusler alloy NiMnSb is a promising candidate for applications in spintronic devices due to its low magnetic damping and its rich anisotropies. Here we use ferromagnetic resonance (FMR) measurements and calculations from first principles to investigate how the composition of the epitaxially grown NiMnSb influences the magnetodynamic properties of saturation magnetization M-S, Gilbert damping alpha, and exchange stiffness A. M-S and A are shown to have a maximum for stoichiometric composition, while the Gilbert damping is minimum. We find excellent quantitative agreement between theory and experiment for M-S and alpha. The calculated A shows the same trend as the experimental data but has a larger magnitude. In addition to the unique in-plane anisotropy of the material, these tunabilities of the magnetodynamic properties can be taken advantage of when employing NiMnSb films in magnonic devices.

引用

页数：7

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