@article{discovery10123127,
           month = {January},
          volume = {118},
            year = {2021},
           title = {Parity-controlled spin-wave excitations in synthetic antiferromagnets},
          number = {3},
         journal = {Applied Physics Letters},
            note = {Copyright 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).},
        abstract = {We report in this study the current-induced-torque excitation of acoustic and optical modes in Ta/NiFe/Ru/NiFe/Ta synthetic
antiferromagnet stacks grown on SiO2/Si substrates. The two Ta layers serve as spin torque sources with the opposite polarizations in both
spin currents and Oersted fields acting on their adjacent NiFe layers. This can create the odd symmetry of spatial spin torque distribution
across the growth direction, allowing us to observe different spin-wave excitation efficiency from synthetic antiferromagnets excited by
homogeneous torques. We analyze the torque symmetry by the in-plane angular dependence of symmetric and anti-symmetric line shape
amplitudes for their resonance and confirm the parallel (perpendicular) pumping nature for the acoustic (optical) modes in our devices,
which is in stark contrast to the modes excited by spatially homogeneous torques. We also present our macrospin model for this particular
spin-torque excitation geometry, which excellently supports our experimental observation. Our results offer capability of controlling spinwave excitations by local spin-torque sources, and we can explore further spin-wave control schemes based on this concept.},
          author = {Sud, A and Koike, Y and Iihama, S and Zollitsch, C and Mizukami, S and Kurebayashi, H},
             url = {http://doi.org/10.1063/5.0037427}
}