Synchrotron X-radiation topography studies of the magnetization process in Tb0·27 Dy0·73 Fe2

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Abstract
The domain structure changes occurring during magnetization of a (110) oriented disc of Tb0·27 Dy0·73 Fe2 have been studied by synchrotron X-radiation topography. Despite there being two easy directions in the specimen surface, the commonest demagnetized configuration consisted of 71° walls on (001) between domains magnetized parallel to [111] and [111], or [111] and [111], etc. In each case one direction is inclined to the specimen surface and the configuration would appear to be somewhat unfavourable magnetostatically. Domain-wall energy calculations are presented for many possible wall geometries in the ⟨111⟩ easy system. including magneto-elastic terms in the wall energy. These show that the 71° (001) walls have a very low wall energy. During magnetization in a field applied along principal crystallographic directions in the surface, a structure of skew 109° walls formed in low fields. This structure, between domains both magnetized in directions inclined to the surface, and having equal components of magnetization in the specimen plane, is immobile and does not move in the highest fields available. This explains the slow approach to saturation, following an initial rapid rise, observed in bulk magnetization experiments.

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