Strong non-equilibrium effects in spin torque systems

Abstract

We consider a problem of persistent magnetization precession in a single domain ferromagnetic nano particle under the driving by the spin-transfer torque. We find that the adjustment of the electronic distribution function in the particle renders this state unstable. Instead, abrupt switching of the spin orientation is predicted upon increase of the spin-transfer torque current. On the technical level, we derive an effective action of the type of Ambegaokar-Eckern-Schön action for the coupled dynamics of magnetization (gauge group $SU(2)$) and voltage (gauge group $U(1)$).

14 pages, 3 figures

References in corpus (15)

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• Geometric Quantum Noise of Spin
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Cited by in corpus (12)

• Transient spin dynamics in a single-molecule magnet
• Charge Transport and Entropy Production Rate in Magnetically Active Molecular Dimer
• Mesoscopic Stoner instability in open quantum dots: suppression of Coleman-Weinberg mechanism by electron tunneling
• Spin pumping and torque statistics in the quantum noise limit
• Non-linear spin torque, pumping and cooling in superconductor/ferromagnet systems
• Current noise geometrically generated by a driven magnet
• A thermally driven spin-transfer-torque system far from equilibrium: enhancement of the thermoelectric current via pumping current
• Charge conservation in spin torque oscillators leads to a self-induced torque
• Quantum noise in the spin transfer torque effect
• Spin transfer torques and spin-dependent transport in a metallic F/AF/N tunneling junction
• Coulomb blockade of chiral Majorana and complex fermions far from equilibrium
• Spin transport through a nanojunction with a precessing anisotropic molecular spin: Quantum interference and spin-transfer torque