Abstract
A study on the exchange bias (EB) effect in an hcp (0 0 0 2)-textured Co3Pt alloy film biased by a thin CoO film is presented. The Co3Pt film reveals an out-of-plane easy axis of magnetization although it was grown on an amorphous silica substrate at room temperature. Similar EB fields measured in in-plane and out-of-plane directions of the CoO/Co3Pt bilayer system were observed for maximum cooling field. Whereas a pronounced cooling field dependence of the EB field is observed in the in-plane geometry, it remains constant in the out-of-plane direction. The temperature evolution of the coercivity and the shift of the hysteresis loop caused by the EB effect are discussed in terms of thermal activation accounting for the temperature dependent competition between the interfacial exchange energy and the anisotropy energy of antiferromagnetic grains.
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