Spin transport and tunable Gilbert damping in a single-molecule magnet junction

Abstract

We study time-dependent electronic and spin transport through an electronic level connected to two leads and coupled with a single-molecule magnet via exchange interaction. The molecular spin is treated as a classical variable and precesses around an external magnetic field. We derive expressions for charge and spin currents by means of the Keldysh non-equilibrium Green's functions technique in linear order with respect to the time-dependent magnetic field created by this precession. The coupling between the electronic spins and the magnetization dynamics of the molecule creates inelastic tunneling processes which contribute to the spin currents. The inelastic spin currents, in turn, generate a spin-transfer torque acting on the molecular spin. This back-action includes a contribution to the Gilbert damping and a modification of the precession frequency. The Gilbert damping coefficient can be controlled by the bias and gate voltages or via the external magnetic field and has a non-monotonic dependence on the tunneling rates.

11 pages, 9 figures, final version including corrections to published article

References in corpus (18)

• Spin Transfer Torques
• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Electric Field Controlled Magnetic Anisotropy in a Single Molecule
• Berry Phase Oscillations of the Kondo Effect in Single-Molecule Magnets
• Spin-transfer torque in magnetic tunnel junctions: Scattering theory
• Spin dynamics in a superconductor / ferromagnet proximity system
• Kondo-transport spectroscopy of single molecule magnets
• Current-induced switching in transport through anisotropic magnetic molecules
• Spin-torque shot noise in magnetic tunnel junctions
• Tunneling through magnetic molecules with arbitrary angle between easy axis and magnetic field
• Manipulation with Andreev states in spin active mesoscopic Josephson junctions
• Memristive properties of single-molecule magnets
• Transport and magnetization dynamics in a superconductor/single-molecule magnet/superconductor junction
• Subnanosecond switching of local spin-exchange coupled to ferromagnets
• Spin-precession-assisted supercurrent in a superconducting quantum point contact coupled to a single-molecule magnet
• Transport and semiclassical dynamics of coupled quantum dots interacting with a local magnetic moment

Cited by in corpus (10)

• Time-dependent spin and transport properties of a single-molecule magnet in a tunnel junction
• Transient spin dynamics in a single-molecule magnet
• Unified framework of the microscopic Landau-Lifshitz-Gilbert equation and its application to Skyrmion dynamics
• Photon-assisted electronic and spin transport in a junction containing precessing molecular spin
• Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions
• Dynamical exchange and phase induced switching of a localized molecular spin
• Nonequilibrium dynamics in a spin valve with noncollinear magnetization
• Shot noise of charge and spin transport in a junction with a precessing 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