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Polarization is a key ingredient of all waves, including the electromagneticwave, the acoustic wave, as well as the spin wave. Due to the fixedferromagnetic order, the spin wave in ferromagnet is limited to the rightcircular polarization. The spin wave in antiferromagnet, however, is endowedwith the full polarization degree of freedom because of the two identicalmagnetic sublattices. In the synthetic antiferromagnet, the two magneticsublattices are spatially separated into two sublayers. The circularpolarization of spin wave is partially locked to the magnetic sublattice of theantiferromagnet, thus to the sublayer in synthetic antiferromagnet. Based onthis unique polarization-sublayer locking mechanism, we show that both thecircular spin wave polarizer and retarder (wave-plate) can be straightforwardlyrealized using synthetic antiferromagnets by restructuring the sublayers, e.g.by removing or capping a portion of a sublayer. Manipulating spin wavepolarization by geometrical engineering provides a simple yet powerful paradigmin harnessing the spin wave polarization for spin information processing.

Manipulating spin wave polarization in synthetic antiferromagnet