Manipulating Ferrimagnets by Fields and Currents
arXiv:2110.06204 · doi:10.1103/PhysRevB.105.064410
Abstract
Ferrimagnets (FIMs) can function as high-frequency antiferromagnets while being easy to detect as ferromagnets, offering unique opportunities for ultrafast device applications. While the physical behavior of FIMs near the compensation point has been widely studied, there lacks a generic understanding of FIMs where the ratio of sublattice spins can vary freely between the ferromagnetic and antiferromagnetic limits. Here we investigate the physical properties of a model two-sublattice FIM manipulated by static magnetic fields and current-induced torques. By continuously varying the ratio of sublattice spins, we clarify how the dynamical chiral modes in an FIM are intrinsically connected to their ferro- and antiferromagnetic counterparts, which reveals unique features not visible near the compensation point. In particular, we find that current-induced torques can trigger spontaneous oscillation of the terahertz exchange mode. Compared with its realization in antiferromagnets, a spin-torque oscillator using FIMs not only has a reduced threshold current density but also can be self-stabilized, obviating the need for dynamic feedback.
arXiv comment9 pages and 7 figures
References in corpus (13)
- Antiferromagnetic spintronics
- Fast domain wall motion induced by antiferromagnetic spin dynamics at the angular momentum compensation temperature of ferrimagnets
- Spin pumping and spin-transfer torques in antiferromagnets
- Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films
- Spin transfer and current-induced switching in antiferromagnets
- Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
- Spin Insulatronics
- Self-Focusing Skyrmion Racetracks in Ferrimagnets
- Gilbert damping phenomenology for two-sublattice magnets
- Spin pumping and shot noise in ferrimagnets: bridging ferro- and antiferromagnets
- Sub-terahertz ferrimagnetic spin-transfer torque oscillator
- Spin-Torque-driven Terahertz Auto Oscillations in Non-Collinear Coplanar Antiferromagnets
- Spin pumping in noncollinear antiferromagnets