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Diffusion based degradation mechanisms in giant magnetoresistive spin valves

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arxiv 0806.2978 v1 pith:4KSGVC7J submitted 2008-06-18 cond-mat.mtrl-sci

Diffusion based degradation mechanisms in giant magnetoresistive spin valves

classification cond-mat.mtrl-sci
keywords degradationdiffusioneffectfunctionalgiantlayerlayersmagnetoresistive
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Spin valve systems based on the giant magnetoresistive (GMR) effect as used for example in hard disks and automotive applications consist of several functional metallic thin film layers. We have identified by secondary ion mass spectrometry (SIMS) two main degradation mechanisms: One is related to oxygen diffusion through a protective cap layer, and the other one is interdiffusion directly at the functional layers of the GMR stack. By choosing a suitable material as cap layer (TaN), the oxidation effect can be suppressed.

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