A magnetic after-effect as transition between two domain phases of garnet film

Abstract

We report the results of theoretical and experimental studies of the magnetic after-effect in epitaxial YIG films with multiple easy axes. The transition from the initial metastable domain phase (stripe domains) to the equilibrium domain phase (undulated domains) with a smaller period occurs after switching off the external magnetic field and takes about 10-15 s. It is observed that the velocity of motion of the phase-boundary domain wall is a factor of 3-4 decades less than domain wall velocities in each of the domain phases. To explain this we devised a domain structure model of these films (using experimental results) and calculated the mobility coefficient of the phase-boundary domain wall. It is shown that the phase-boundary domain wall moving under the influence of the difference between two domain phase pressures causes relaxation of a diffusional type in the spin system. The after-effect time is the phase transition time and it is approximately inversely proportional to the difference in domain periods of the two domain structures.

Crystalline, magnetic and domain structure of epitaxial ferritegarnet films (review)

“…5). When B = B 2 , the energies of the CMD and the homogeneous state become equal, however, in the film there may be metastable CMD [19]. In this case, the dependence curve The CMD can be used to create non-volatile magnetic memory elements where there are no moving parts.…”