Spin Dynamics in a Tunnel Junction between Ferromagnets

Abstract

The dynamics of a single spin embedded in the tunnel junction (quantum point contact) between ferromagnets is addressed. Using the Keldysh technique, we derive a quantum Langevin equation. As a consequence of the spin-polarization in the leads, the spin displays a rich and unusual dynamics. Parallel configured and equally strong magnetic moments in the leads yield an ordinary spin precession with a Larmor frequency given by the effective magnetic field. Unequal and/or non-parallel configured magnetization, however, causes nutation of the spin in addition to the precession. Our predictions may be directly tested for macroscopic spin clusters.

5 pages, 1 figure, accepted in the New Journal of Physics

References in corpus (11)

• Single Spin Dynamics and Decoherence in a Quantum Dot via Charge Transport
• Novel Spin Dynamics in a Josephson Junction
• Frequency-Dependent Current Noise through Quantum-Dot Spin Valves
• Interference effects in resonant magneto-transport
• Coherent effects in magneto-transport through Zeeman split levels
• Quantum Electronic Transport through a Precessing Spin
• Tunneling measurement of quantum spin oscillations
• Angular Conductance Resonances of Quantum Dots Non-Collinearly Coupled to Ferromagnetic Leads
• Nondemolition measurements of a single quantum spin using Josephson oscillations
• Quantum Dynamics in Non-equilibrium Strongly Correlated Environments
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Cited by in corpus (23)

• Atomistic spin dynamic method with both damping and moment of inertia effects included from first principles
• Spin Dynamics with Inertia in Metallic Ferromagnets
• Non-equilibrium magnetic interactions in strongly correlated systems
• Microscopic Theory for Coupled Atomistic Magnetization and Lattice Dynamics
• Electrical and Thermal Control of Magnetic Exchange Interactions
• Effective temperature and Gilbert damping of a current-driven localized spin
• Spintronics meets nonadiabatic molecular dynamics: Geometric spin torque and damping on noncollinear classical magnetism due to electronic open quantum system
• Time-dependent spin and transport properties of a single-molecule magnet in a tunnel junction
• Magnetization nutation induced by surface effects in nanomagnets
• Detection of spin reversal and nutations through current measurements
• Dynamical exchange interaction between localized spins out of equilibrium
• Electron Paramagnetic Resonance of Single Magnetic Moment on a Surface
• Transient spin dynamics in a single-molecule magnet
• Subnanosecond switching of local spin-exchange coupled to ferromagnets
• Annihilation of topological solitons in magnetism with spin wave burst finale: The role of nonequilibrium electrons causing nonlocal damping and spin pumping over ultrabroadband frequency range
• When can localized spins interacting with conduction electrons in ferro- or antiferromagnets be described classically via the Landau-Lifshitz equation: Transition from quantum many-body entangled to quantum-classical nonequilibrium states
• Charge Transport and Entropy Production Rate in Magnetically Active Molecular Dimer
• Theory of spin inelastic tunneling spectroscopy for superconductor-superconductor and superconductor-metal junctions
• Non-linear spin torque, pumping and cooling in superconductor/ferromagnet systems
• Spin pumping and torque statistics in the quantum noise limit
• Dynamical exchange and phase induced switching of a localized molecular spin
• Effect of uniaxial magnetic anisotropy on charge transport in a junction with a precessing anisotropic molecular spin
• Spin transport through a nanojunction with a precessing anisotropic molecular spin: Quantum interference and spin-transfer torque