The spacer here is to make sure that the bottom

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Unformatted text preview: r. The spacer here is to make sure that the bottom ferromagnetic will not affect the spin of top ferromagnetic layer. When the spin-valve reads the spin from a data point, the spin orientation of the free layer will change accordingly (align the spin direction with the data point). If the spins of both ferromagnetic layers are parallel, the current will feel less scattering effects and lower resistance state. On the contrary, if both spins are antiparallel, current feel more scattering, and lead to higher resistance stat...
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