Influence of spin transfer torque on noise in magnetic tunnel junctions

S. Petit, N. de Mestier, C. Baraduc, C. Thirion, B. Diény

We showed for the first time that the widely studied “spin transfer torque” phenomenon presents a measurable effect below the critical threshold. In the sub-critical regime, the transfer of momentum from the conduction electrons to the magnetisation fluctuations results in a surprising dependence of the magnetic noise upon the sign of the bias current. Remarkably, the spin transfer can be used to quench the thermally activated magnetization fluctuations. A precise de- scription of this effect was achieved by developing an analytical model to analyse our experimental data.

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