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Spin-dependent transport in antiferromagnetic tunnel junctions

Abstract : We investigate the behaviour of spin transfer torque (STT) and tunnelling magnetoresistance (TMR) in epitaxial antiferromagnetic-based tunnel junctions using tight binding calculations in the framework of the Keldysh formalism. We find that the STT out-of-plane component exhibits a staggered spatial distribution similar to its in-plane component. This behaviour is specific to the use of a tunnel barrier and significantly differs from the out-of-plane torques reported in previous works using a metallic spacer. Additionally, we show that unlike conventional ferromagnetic-based tunnel junctions, the TMR can increase with applied bias and reach values comparable to typical magnetoresistances found for usual spin valves.
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P. Merodio, A. Kalitsov, H. Béa, Vincent Baltz, M. Chshiev. Spin-dependent transport in antiferromagnetic tunnel junctions. Applied Physics Letters, American Institute of Physics, 2014, 105, pp.122403. ⟨10.1063/1.4896291⟩. ⟨hal-01683647⟩

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