Abstract
Co 70 Ni 10 Pt 20 ∕ Ru ∕ Co 90 Fe 10 trilayer was used as pinning/pinned layer in spin valves after deposition condition of CoNiPt was studied. The influence of hard-layer, soft-layer, and Cu-spacer-layer thicknesses on exchange bias, interlayer coupling, free-layer coercivity, and magnetoresistance (MR) ratio were systematically studied. Oscillation of interlayer coupling and exchange bias with respect to the thickness of spacer or hard layer are found. MR of a spin valve with structure Cr(3)∕CoNiPt(4)∕Ru(0.8)∕CoFe(2.3)∕Cu(2.05)∕CoFe(2.6)∕Cu(1.1)∕Ta(1) (in nanometer) reached 10.48%, whereas its coercivity of free layer was increased to 190 Oe and is attributed to two reasons: one is the poor (111) texture and small grain size of free layer with Cr as the seed layer, and the other is magnetostatic coupling between the free layer and hard layer.
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