Thermal spin-transfer in Fe-MgO-Fe tunnel junctions

Details Thermal spin-transfer in Fe-MgO-Fe tunnel junctions Thermal spin-transfer in Fe-MgO-Fe tunnel junctions

2011-06-08

arxiv.org/abs/1106.1572v2

PRL 107, 176603 (2011)

Physics

Condensed Matter

Materials Science

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.107.176603

We compute thermal spin transfer torques (TST) in Fe-MgO-Fe tunnel junctions using a first principles wave function-matching method. At room temperature, the TST in a junction with 3 MgO monolayers amounts to 10^-7J/m^2/K, which is estimated to cause magnetization reversal for temperature differences over the barrier of the order of 10 K. The large TST can be explained by multiple scattering between interface states through ultrathin barriers. The angular dependence of the TST can be very skewed, possibly leading to thermally induced high-frequency generation.

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