巨磁阻自旋阀中基于扩散的退化机制
Diffusion based degradation mechanisms in giant magnetoresistive spin valves
摘要：
例如在硬盘和汽车应用中使用的基于巨磁阻（GMR）效应的自旋阀系统由几个功能性金属薄膜层组成。我们已经确定了二次离子质谱（SIMS）的两个主要退化机制：一个是有关的氧扩散通过保护帽层，另一个是直接在GMR堆栈的功能层的相互扩散。通过选择合适的材料作为覆盖层（TaN），可以抑制氧化效应。
英文摘要：
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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