Kai Di, Hock Siah Lim, Vanessa Li Zhang, Ser Choon Ng, Meng Hau Kuok
Nonreciprocal wave propagation is crucial to the stable operation of ultra-compact chips with low power consumption, and is the basis of unidirectional devices that are widely used in information technology and telecommunications. In the rapidly expanding fields of magnonics and magnon spintronics, spin waves, which are elementary excitations in ordered magnetic materials, act as information carriers. Numerous studies have been conducted on the manipulation and control of spin waves but, to our knowledge, none are devoted to their nonreciprocity at the nanoscale. Here, based on numerical simulations and a novel analytical coupled-mode theory of spin waves, we theoretically demonstrate linear nonreciprocal interband spin-wave mode transitions in a nanoscale waveguide, arising from time-reversal and space-inversion symmetry breaking by an applied magnetic field. Importantly, such spinwave nonreciprocity could be realized at the nanoscale, thus facilitating magnonic nanodevice integration.
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http://arxiv.org/abs/1305.5018
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