Abstract
Unidirectional properties (shifts of BH loop) were observed in (YCa) 3(FeCoGe) 5O 12 films grown on (100) GGG substrate. These shifts could be flipped by an external field (≈ 50 Oe) applied along the normal to the film or in the sample plane. The properties are similar to those of magnetic materials characterized by unidirectional anisotropy (e.g. exchange-coupled soft and hard magnetic system). The proposed domain structure model of a homogeneous sample with mixed magnetic anisotropy explains these peculiarities reasonably well. The formula for the estimation of a self-biasing field vector is given for a multi-easy axes magnet. The magnetization processes were investigated using the Faraday effect (domain structure image was analyzed visually and digitally), low frequency magnetic susceptibility technique and a vibrating sample magnetometer. The room temperature FMR spectra and the Faraday rotation spectra were analyzed, too. Microscopic theory and domain structure model are discussed for the explanation of the previously reported effects: (i) unexpectedly low and changeable domain wall velocity v ( v, which depends on the width of the applied field pulses, is in the approximate range 1 ßm/s-220 m/s); (ii) domain structure shape memory.
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