1. Anisotropic manipulation of terahertz spin-waves by spin-orbit torque in a canted antiferromagnet
- Author
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Kim, T. H., Kim, Jung-Il, Kim, Geun-Ju, Jang, Kwang-Ho, and Choi, G. -M.
- Subjects
Physics - Applied Physics ,Condensed Matter - Materials Science - Abstract
We theoretically and numerically elucidate the electrical control over spin waves in antiferromagnetic materials (AFM) with biaxial anisotropies and Dzyaloshinskii-Moriya interactions. The spin wave dispersion in an AFM manifests as a bifurcated spectrum with distinct high-frequency and low-frequency bands. Utilizing a heterostructure comprised of platinum and the AFM, we demonstrate anisotropic control of spin-wave bands via spin currents with three-dimensional spin polarizations, encompassing both resonant and propagating wave modes. Moreover, leveraging the confined geometry, we explore the possibility of controlling spin waves within a spectral domain ranging from tens of gigahertz to sub-terahertz frequencies. The implications of our findings suggest the potential for developing a terahertz wave source with electrical tunability, thereby facilitating its incorporation into ultrafast, broadband, and wireless communication technologies.
- Published
- 2024