Conditions for the Spin Wave Nonreciprocity in an Array of Dipolarly Coupled Magnetic Nanopillars
ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
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It is demonstrated that collective spin waves SWs propagating in complex periodic arrays of dipolarly coupled magnetic nanopillars existing in a saturated single-domain ground state in a zero bias magnetic field could be nonreciprocal. To guarantee the SW nonreciprocity two conditions should be fulfilled i existence of a nonzero out-of-plane component of the pillars static magnetization and ii a complex periodicity of arrays ground state with at least two elements per a primitive cell, if the elements are different, and at least three elements per a primitive cell, if the elements are identical. The obtained results show that coupled arrays of magnetic nanopillars with out-of-plane shape orand crystallographic anisotropy could be used for the development of miniature unbiased microwave isolators and circulators.
- Electricity and Magnetism
- Solid State Physics