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Two ferromagnetic layers separated by a thicker non-magnetic Cu layer. If the magnetic moments M1 in the left layer are excited to a precession around a magnetic field axis Bz, then the precession of the magnetic moments M2 in the second layer is also affected. This mutual interaction is called the spin pumping effect and causes the precession of m1 to be more damped when the moments M1 and M2 are aligned antiparallel than in the parallel case. The spin current, which is “pumped” from one ferromagnetic layer to the other, is schematically indicated by small arrows
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