Domain formation in exchange-coupled double layers

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Abstract
Exchange-coupled double layers consisting of two ferrimagnetic layers of different composition of the general system GdTb-FeCo were experimentally studied by magnetic reversal experiments using the Faraday effect. A novel type of magnetic reversal experiment was developed in which one of the layers is in a partly demagnetized state when the other layer is reversed. In order to interpret the resulting complicated Faraday hysteresis curves, phenomenological domain formation models are developed, including the following processes which are not possible in single layers: creation/annihilation of interface wall; reversal of the magnetization against (antiparallel to) the external field; vertical motion of the interface wall; competing reversal processes in the two layers. A method is described to estimate the distribution of compensation temperatures in a layer from reversal curves of double layers.

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