Peculiarities of magnetization of garnet films [210]

Epitaxial garnet films grown on a GGG substrate with an orientation [210] have orthorhombic anisotropy and are considered as a uniaxial magnetics with an easy axis tilted from a direction perpendicular to the film surface at an angle Theta /sub 0/ approximately=30 degrees . Such films have an oriented stripe domain structure. Their magnetization is carried out by a displacement of 180 degrees domain walls under the influence of both bias and in-plane magnetic fields. A magnetic susceptibility tensor determined by the effective demagnetizing factor and the angle Theta /sub 0/ is proposed. The critical dependencies of the nucleation field and of the collapse field are obtained. The magnetizing curves obtained in a bias or in an in-plane field are shifted by applying an additional orthogonal DC field. Simple techniques of the determination of the easy axis orientation and of the saturation magnetization value are presented.<
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