Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics
Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics
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.
Wang, Weiwei
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Dvornik, Mykola
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Bisotti, Mark-Antonio
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Chernyshenko, Dmitri
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Beg, Marijan
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Albert, Maximilian
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Vansteenkiste, Arne
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Waeyenberge, Bartel V.
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Kuchko, Andriy N.
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Kruglyak, Volodymyr
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Fangohr, Hans
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August 2015
Wang, Weiwei
42981e5f-b7ee-44f7-a64d-d47ab0cacbce
Dvornik, Mykola
318e8892-2783-487b-b8cd-625373e6fd20
Bisotti, Mark-Antonio
be2d7abd-afdc-4d18-a2e9-a633d73a67b9
Chernyshenko, Dmitri
62dad926-c42a-43db-9312-2cacbd53a042
Beg, Marijan
5c7cc1ff-f244-471f-b964-9f24e0628153
Albert, Maximilian
a8049610-1e98-4cfb-b59a-177645a42b47
Vansteenkiste, Arne
2fc4efbe-3f40-4223-99f3-6712b670074a
Waeyenberge, Bartel V.
c982e2f4-274a-4a9b-acbd-21d3e618c26c
Kuchko, Andriy N.
e95ab583-6deb-46c6-9c60-0ab5ca948086
Kruglyak, Volodymyr
3ef6395c-1dc9-4f36-9520-2ae0fd669239
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Wang, Weiwei, Dvornik, Mykola, Bisotti, Mark-Antonio, Chernyshenko, Dmitri, Beg, Marijan, Albert, Maximilian, Vansteenkiste, Arne, Waeyenberge, Bartel V., Kuchko, Andriy N., Kruglyak, Volodymyr and Fangohr, Hans
(2015)
Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics.
Physical Review B, 92 (5), [54430].
(doi:10.1103/PhysRevB.92.054430).
Abstract
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.
Text
1508.01478v1.pdf
- Accepted Manuscript
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e-pub ahead of print date: 21 August 2015
Published date: August 2015
Organisations:
Computational Engineering & Design Group
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Local EPrints ID: 382644
URI: http://eprints.soton.ac.uk/id/eprint/382644
ISSN: 1550-235X
PURE UUID: b8c7cd61-5d16-4dd5-988e-d099cd9202ad
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Date deposited: 30 Oct 2015 14:54
Last modified: 15 Mar 2024 03:50
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Contributors
Author:
Weiwei Wang
Author:
Mykola Dvornik
Author:
Mark-Antonio Bisotti
Author:
Dmitri Chernyshenko
Author:
Marijan Beg
Author:
Maximilian Albert
Author:
Arne Vansteenkiste
Author:
Bartel V. Waeyenberge
Author:
Andriy N. Kuchko
Author:
Volodymyr Kruglyak
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