Dynamic Behavior of Domain Walls
in Magnetically Uniaxial Films with In-Plane
Anisotropy in the Presence of Easy-Plane
Surface Anisotropy

B. N. Filippov, L. G. Korzunin, and E. V. Rebryakova

Institute of Metal Physics, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 18, Ekaterinburg, 620219 Russia

Received June 17, 1997

Abstract—The dynamic behavior of domain walls with a two-dimensional magnetization distribution is stud-
ied as a function of surface anisotropy of easy-plane type (characterized by the constant K_s) in films with in-
plane bulk magnetic anisotropy. The case of a relatively small K_s < K_0,s is investigated. It is shown that K_0,s is
the value at which the critical field H_c separating the regions of steady and unsteady domain wall motion is min-
imal. A decrease in H_c with an increase in K_s [0, K_0,s] is predicted. The period T of dynamic rearrangement
in the internal structure of the domain wall is found to vary strongly with K_s in the interval [0, K_0,s], because H_c
depends on K_s, and T changes fast as the external magnetic field varies in the neighborhood of H_c.

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