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Magnetic non-contact friction from domain wall dynamics actuated by oscillatory mechanical motion

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Magnetic non-contact friction from domain wall dynamics actuated by oscillatory mechanical motion. / Rissanen, Ilari; Laurson, Lasse.

In: Journal of Physics D: Applied Physics, Vol. 52, No. 44, 445002, 13.08.2019.

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Rissanen, Ilari ; Laurson, Lasse. / Magnetic non-contact friction from domain wall dynamics actuated by oscillatory mechanical motion. In: Journal of Physics D: Applied Physics. 2019 ; Vol. 52, No. 44.

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@article{5210cc5f0bd34fdaa6ef51ceb2f1228b,
title = "Magnetic non-contact friction from domain wall dynamics actuated by oscillatory mechanical motion",
abstract = "Magnetic friction is a form of non-contact friction arising from the dissipation of energy in a magnet due to spin reorientation in a magnetic field. In this paper, we study magnetic friction in the context of micromagnetics, using our recent implementation of smooth spring-driven motion (Rissanen and Laurson 2018 Phys. Rev. E 97 053301) to simulate ring-down measurements in two setups where domain wall dynamics is induced by mechanical motion. These include a single thin film with a domain wall in an external field and a setup mimicking a magnetic cantilever tip and substrate, in which the two magnets interact through dipolar interactions. We investigate how various micromagnetic parameters influence the domain wall dynamics actuated by the oscillatory spring-driven mechanical motion and the resulting damping coefficient. Our simulations show that the magnitude of magnetic friction can be comparable to other forms of non-contact friction. For oscillation frequencies lower than those inducing excitations of the internal structure of the domain walls, the damping coefficient is found to be independent of frequency. Hence, our results obtained in the frequency range from 8-112 MHz are expected to be relevant also for typical experimental setups operating in the 100 kHz range.",
keywords = "magnetic friction, micromagnetics, thin films",
author = "Ilari Rissanen and Lasse Laurson",
year = "2019",
month = "8",
day = "13",
doi = "10.1088/1361-6463/ab351f",
language = "English",
volume = "52",
journal = "Journal of Physics D: Applied Physics",
issn = "0022-3727",
publisher = "IOP Publishing",
number = "44",

}

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TY - JOUR

T1 - Magnetic non-contact friction from domain wall dynamics actuated by oscillatory mechanical motion

AU - Rissanen, Ilari

AU - Laurson, Lasse

PY - 2019/8/13

Y1 - 2019/8/13

N2 - Magnetic friction is a form of non-contact friction arising from the dissipation of energy in a magnet due to spin reorientation in a magnetic field. In this paper, we study magnetic friction in the context of micromagnetics, using our recent implementation of smooth spring-driven motion (Rissanen and Laurson 2018 Phys. Rev. E 97 053301) to simulate ring-down measurements in two setups where domain wall dynamics is induced by mechanical motion. These include a single thin film with a domain wall in an external field and a setup mimicking a magnetic cantilever tip and substrate, in which the two magnets interact through dipolar interactions. We investigate how various micromagnetic parameters influence the domain wall dynamics actuated by the oscillatory spring-driven mechanical motion and the resulting damping coefficient. Our simulations show that the magnitude of magnetic friction can be comparable to other forms of non-contact friction. For oscillation frequencies lower than those inducing excitations of the internal structure of the domain walls, the damping coefficient is found to be independent of frequency. Hence, our results obtained in the frequency range from 8-112 MHz are expected to be relevant also for typical experimental setups operating in the 100 kHz range.

AB - Magnetic friction is a form of non-contact friction arising from the dissipation of energy in a magnet due to spin reorientation in a magnetic field. In this paper, we study magnetic friction in the context of micromagnetics, using our recent implementation of smooth spring-driven motion (Rissanen and Laurson 2018 Phys. Rev. E 97 053301) to simulate ring-down measurements in two setups where domain wall dynamics is induced by mechanical motion. These include a single thin film with a domain wall in an external field and a setup mimicking a magnetic cantilever tip and substrate, in which the two magnets interact through dipolar interactions. We investigate how various micromagnetic parameters influence the domain wall dynamics actuated by the oscillatory spring-driven mechanical motion and the resulting damping coefficient. Our simulations show that the magnitude of magnetic friction can be comparable to other forms of non-contact friction. For oscillation frequencies lower than those inducing excitations of the internal structure of the domain walls, the damping coefficient is found to be independent of frequency. Hence, our results obtained in the frequency range from 8-112 MHz are expected to be relevant also for typical experimental setups operating in the 100 kHz range.

KW - magnetic friction

KW - micromagnetics

KW - thin films

U2 - 10.1088/1361-6463/ab351f

DO - 10.1088/1361-6463/ab351f

M3 - Article

VL - 52

JO - Journal of Physics D: Applied Physics

JF - Journal of Physics D: Applied Physics

SN - 0022-3727

IS - 44

M1 - 445002

ER -