期刊
PHYSICAL REVIEW B
卷 105, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.104407
关键词
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资金
- Ministry of Education (MOE) Tier-II (NUS) [MOE2018-T2-2-117, R-263-000-E45-112, R-398-000-092-112]
- MOE Tier-I FRC grant (NUS) [R-263-000-D66-114]
- Agency for Science, Technology and Research (A*STAR) under its AME Individual Research Grants [A1983c0037]
- National Research Foundation (NRF) Singapore [NRFI06-2020-0015]
We have presented a model to calculate the injection of sub-THz spin current transients, and studied the effects of damping parameters on the spin pumping signal. We found that the amplitude of the spin current transients is influenced by cross-sublattice damping, while spin pumping can be reduced by increasing the cross-sublattice spin-mixing conductance.
We present an analytical model to compute the subterahertz (sub-THz) spin current transients injected from the insulating uniaxial antiferromagnet (AFM) into the adjacent nonmagnetic layer excited by spin pumping under the antiferromagnetic resonance condition, where both intra- and cross-sublattice damping parameters are treated on an equal footing. As expected, the sub-THz spin-pumping signal decreases with larger intra-sublattice damping dissipation. Interestingly, it is found that the amplitude of the spin current transient is enhanced with increasing cross-sublattice damping. On the other hand, the spin pumping is reduced by increasing the cross-sublattice spin-mixing conductance. These trends indicate that the intrinsic origin of the cross-sublattice damping in the bulk AFM enhances the spin current transients while its extrinsic origin, directly related to the interfacial cross-sublattice spin-mixing conductance, has the opposite effect. Our results suggest the important role of the previously neglected cross-sublattice damping in modulating the sub-THz spin current pulses for ultrafast spintronic applications.
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