Nonreciprocal coherent coupling of nanomagnets by exchange spin waves
spintronics, nanomagnets, spin waves, coherent coupling, nonreciprocity
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.
Tsinghua University Press
Hanchen Wang, Jilei Chen, Tao Yu et al. Nonreciprocal coherent coupling of nanomagnets by exchange spin waves. Nano Research 2021, 14(7): 2133-2138.