MOBILITY OF DOMAIN-WALLS IN LOW-LOSS GARNET-FILMS

The dependence of the domain wall mobility on the strength of a static magnetic field applied in the plane of the sample is investigated in single-crystal garnet films of the system YBiFeGa with perpendicular m agnetic anisotropy and a narrow ferromagnetic resonance line. It is sh own that, as in the case of YIG single crystals with cubic magnetic an isotropy, wall motion gives rise to an additional energy loss contribu tion far greater than the relativistic contribution also present in th e case of homogeneous magnetization. It is established that a mechanis m recently proposed in theory does not give a correct explanation for this additional contribution, because qualitative as well as quantitat ive discrepancies exist between the theoretical conclusions and measur ement data. (C) 1997 American Institute of Physics.