Non-stationary forced motion of domain walls in ferrimagnets close to the spin compensation point

Domain walls motion in ferrimagnets near the sublattices spin compensation point, where the effect of an exchange enhancement in the limit velocity of the wall is present, is studied theoretically. Nonlinear regimes of high-speed (till the limit speed) non-stationary wall motion are found. A region of the parameters of the magnet, where the collective variables approach is not valid, was found. In this region, the wall motion is accompanied by the periodic appearance of instability with respect to the increase in spin vibrations inside the domain wall.

Key words: domain wall, ferrimagnet, spin compensation point, Walker solution.

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