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

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Researchers

Research units

  • Tampere University

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.

Details

Original languageEnglish
Article number445002
Number of pages11
JournalJournal of Physics D - Applied Physics
Volume52
Issue number44
Publication statusPublished - 30 Oct 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • magnetic friction, thin films, micromagnetics

ID: 36621270