Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics

被引：20

作者：

Wang, Weiwei ^{[1
]}

Dvornik, Mykola ^{[2
,3
]}

Bisotti, Marc-Antonio ^{[1
]}

Chernyshenko, Dmitri ^{[1
]}

Beg, Marijan ^{[1
]}

Albert, Maximilian ^{[1
]}

Vansteenkiste, Arne ^{[2
]}

Waeyenberge, Bartel V. ^{[2
]}

Kuchko, Andriy N. ^{[4
,5
]}

Kruglyak, Volodymyr V. ^{[6
]}

Fangohr, Hans ^{[1
]}

机构：

[1] Univ Southampton, Engn & Environm, Southampton, Hants, England

[2] Univ Ghent, DyNaMat Lab, B-9000 Ghent, Belgium

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

[4] Donetsk Natl Univ, Phys & Tech Dept, Donetsk, Ukraine

[5] Natl Acad Sci Ukraine, Inst Magnetism, UA-03142 Kiev, Ukraine

[6] Univ Exeter, Sch Phys, Exeter, Devon, England

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

MICROMAGNETIC SIMULATIONS;

D O I：

10.1103/PhysRevB.92.054430

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A phenomenological equation called the Landau-Lifshitz-Baryakhtar (LLBar) [Zh. Eksp. Teor. Fiz 87, 1501 (1984) [Sov. Phys. JETP 60, 863 (1984)]] equation, which could be viewed as the combination of the Landau-Lifshitz (LL) equation and an extra "exchange-damping" term, was derived by Baryakhtar using Onsager's relations. We interpret the origin of this exchange damping as nonlocal damping by linking it to the spin current pumping. The LLBar equation is investigated numerically and analytically for the spin-wave decay and domain-wall motion. Our results show that the lifetime and propagation length of short-wavelength magnons in the presence of nonlocal damping could be much smaller than those given by the LL equation. Furthermore, we find that both the domain-wall mobility and the Walker breakdown field are strongly influenced by the nonlocal damping.

引用

页数：10

共 50 条

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