Antiferromagnetic spin Seebeck Effect

Abstract

We report on the observation of the spin Seebeck effect in antiferromagnetic MnF${}_2$. A device scale on-chip heater is deposited on a bilayer of Pt (4 nm)/MnF${}_2$ (110) (30 nm) grown by molecular beam epitaxy on a MgF${}_2$ (110) substrate. Using Pt as a spin detector layer it is possible to measure thermally generated spin current from MnF${}_2$ through the inverse spin Hall effect. The low temperature (2 - 80 K) and high magnetic field (up to 140 kOe) regime is explored. A clear spin flop transition corresponding to the sudden rotation of antiferromagnetic spins out of the easy axis is observed in the spin Seebeck signal when large magnetic fields (>9 T) are applied parallel the easy axis of the MnF${}_2$ thin film. When magnetic field is applied perpendicular to the easy axis, the spin flop transition is absent, as expected.

References in corpus (8)

• Theory of magnon-driven spin Seebeck effect
• Spin pumping and spin-transfer torques in antiferromagnets
• Thermal generation of spin current in an antiferromagnet
• Spin Seebeck effect in antiferromagnets and compensated ferrimagnets
• Unambiguous separation of the inverse spin Hall and anomalous Nernst Effects within a ferromagnetic metal using the spin Seebeck effect
• Spin Seebeck devices using local on-chip heating
• Antiferromagentic resonance detected by DC voltages in MnF${}_2$/Pt bilayers
• Heat transport between antiferromagnetic insulators and normal metals

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