NiO/Co/Cu/Co/CoNbZrスピンバルブの磁気特性と耐熱性

概要

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The magnetic properties and thermal stability of NiO/Co/Cu/(Co)/CoNbZr spin-valves were investigated. Pinned Co with NiO has a coercivity of about 600 Oe and a pinned field of about 100 Oe.On the other hand, freelayer CoNbZr or Co/CoNbZr has a coercivity of less than 100 Oe, and the inter-layer coupling between the pinned and free layers is less than 5Oe. Therefore the system NiO/Co/Cu/Co/CoNbZr works as a spin-valve using different coercivities between the two layers.With only amorphous CoNbZr as a free layer, a 5% GMR effect from the spin-valve was observed.Inserting Co into the free layer enhances the GMR effect by about 2 times.The spinvalves can endure heat treatnent of up to 300℃ .The deterioration that occurs with annealing at temperatures higher than 300 C is caused by the inter-diffusion of Ni from the NiO antiferromagnetic layer.
社団法人日本磁気学会の論文
1998-04-15