Spin-transfer torque induced spin waves in antiferromagnetic insulators

Abstract

We explore the possibility of exciting spin waves in insulating antiferromagnetic films by injecting spin current at the surface. We analyze both magnetically compensated and uncompensated interfaces. We find that the spin current induced spin-transfer torque can excite spin waves in insulating antiferromagnetic materials and that the chirality of the excited spin wave is determined by the polarization of the injected spin current. Furthermore, the presence of magnetic surface anisotropy can greatly increase the accessibility of these excitations.

8 pages, 5 figures

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• Spin Transfer Torques
• Graphene Spintronics
• Superconducting Spintronics
• Room-temperature antiferromagnetic memory resistor
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• Antiferromagnonic Spin Transport from Y${}_3$Fe${}_5$O${}_{12}$ into NiO
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• Excitation of magnon spin photocurrents in antiferromagnetic insulators
• Spin Seebeck effect in paramagnets and antiferromagnets at elevated temperatures
• Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators
• Origin of spin reorientation transitions in antiferromagnetic MnPt-based alloys