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Controlled enhancement of spin-current emission by three-magnon splitting

In this paper, we report the first demonstration of spin current amplification. The spin current is a flow of spin angular momentum without a charge current in electrons, which has potential of forming new spin-based information technology. In collaboration with Prof. Demokritov (University of Munster, Germany), we discovered that non-linear spin-wave interactions can amplify the spin current. The enhancement is caused by the dipole-dipole nature of the interactions, which lacks the rotational symmetry in space. This makes spin angular momentum become a non-conserved physical quantity. Therefore, an additional spin angular momentum can be injected from the lattice through the interactions.