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Journal Article

Nonreciprocal coherent coupling of nanomagnets by exchange spin waves


Yu,  T.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Wang, H., Chen, J., Yu, T., Liu, C., Guo, C., Jia, H., et al. (2021). Nonreciprocal coherent coupling of nanomagnets by exchange spin waves. Nano Research, 69. doi:10.1007/s12274-020-3251-5.

Cite as: http://hdl.handle.net/21.11116/0000-0007-6572-7
Nanomagnets are widely used to store information in non-volatile spintronic devices. Spin waves can transfer information with low-power consumption as their propagations are independent of charge transport. However, to dynamically couple two distant nanomagnets via spin waves remains a major challenge for magnonics. Here we experimentally demonstrate coherent coupling of two distant Co nanowires by fast propagating spin waves in an yttrium iron garnet thin film with sub-50 nm wavelengths. Magnons in two nanomagnets are unidirectionally phase-locked with phase shifts controlled by magnon spin torque and spin-wave propagation. The coupled system is finally formulated by an analytical theory in terms of an effective non-Hermitian Hamiltonian. Our results are attractive for analog neuromorphic computing that requires unidirectional information transmission.