Exchange anisotropy in coupled films of Ni81Fe19 with NiO and CoxNi1−xO

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Abstract
Shifted hysteresis loops were used to investigate exchange anisotropy in 500 Å CoxNi1−xO/300 Å Ni81Fe19 polycrystalline bilayer couples. Bilayers of Ni81Fe19 with NiO have a room‐temperature exchange field, He, of 30 Oe in the as‐deposited state. A maximum in the exchange field at room temperature was observed near x=0.4, indicating an optimal alloying of the properties of the high anisotropy CoO and the high Néel temperature NiO. The blocking temperatures of the exchange couples vary linearly with x, suggesting a linear dependence of the oxide Néel temperature with x.