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Sci Rep. 2015 May 7;5:10153. doi: 10.1038/srep10153.

Enhancement of spin-wave nonreciprocity in magnonic crystals via synthetic antiferromagnetic coupling.

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Department of Physics, National University of Singapore, Singapore 117551.
School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.


Spin-wave nonreciprocity arising from dipole-dipole interaction is insignificant for magnon wavelengths in the sub-100 nm range. Our micromagnetic simulations reveal that for the nanoscale magnonic crystals studied, such nonreciprocity can be greatly enhanced via synthetic antiferromagnetic coupling. The nonreciprocity is manifested as highly asymmetric magnon dispersion curves of the magnonic crystals. Furthermore, based on the study of the dependence of the nonreciprocity on an applied magnetic field, the antiparallel alignment of the magnetizations is shown to be responsible for the enhancement. Our findings would be useful for magnonic and spintronics applications.

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