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Magnetic friction is a form of non-contact friction arising from thedissipation of energy in a magnet due to spin reorientation in a magneticfield. In this paper we study magnetic friction in the context ofmicromagnetics, using our recent implementation of smooth spring-driven motion[Phys. Rev. E. 97, 053301 (2018)] to simulate ring-down measurements in twosetups where domain wall dynamics is induced by mechanical motion. Theseinclude a single thin film with a domain wall in an external field and a setupmimicking a magnetic cantilever tip and substrate, in which the two magnetsinteract through dipolar interactions. We investigate how various micromagneticparameters influence the domain wall dynamics actuated by the oscillatoryspring-driven mechanical motion and the resulting damping coefficient. Oursimulations show that the magnitude of magnetic friction can be comparable toother forms of non-contact friction. For oscillation frequencies lower thanthose inducing excitations of the internal structure of the domain walls, thedamping coefficient is found to be independent of frequency. Hence, our resultsobtained in the frequency range from 8 to 112 MHz are expected to be relevantalso for typical experimental setups operating in the 100 kHz range.

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