For example, present-day read heads in computer hard drives use a device dubbed a spin valve, wherein a layer of a nonmagnetic metal is sandwiched between two ferromagnetic metallic layers.
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- 例如,目前的硬碟读写头使用了类似自旋阀的元件,其构造是一层非磁性金属夹在二层铁磁金属中间。