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Theory of a dynamical coercive force in magnets with microscopic defects

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2 Author(s)
Ivanov, B.A. ; Inst. of Metal Phys., Kiev, Ukraine ; Lyakhimets, S.N.

The peculiar dynamical drag force Fc can arise at the domain wall motion in a magnet with microscopic defects, such that it cannot pin the domain wall in the usual way. The value of Fc is finite as the domain wall velocity v goes to zero. The reason for such behavior is the emission of bending waves of the domain wall. The calculations for different types of impurities as well as for both bulk ferromagnet and ultrathin magnetic layers are presented. In 3D ferromagnet the Fc value is finite at v→0 and this is interpreted as the dynamical coercive force. In the 2D case (e.g. in monolayer films) the drag force diverges at small velocities as Fc ∝1/v1/2. In the film with a finite thickness and very small v the force has a viscous character: Fc∝v

Published in:

Magnetics, IEEE Transactions on  (Volume:30 ,  Issue: 2 )

Date of Publication:

Mar 1994

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