Current-driven destabilization of both collinear configurations in asymmetric spin-valves

Abstract

Spin transfer torque in spin valves usually destabilizes one of the collinear configurations (either parallel or antiparallel) and stabilizes the second one. Apart from this, balance of the spin-transfer and damping torques can lead to steady precessional modes. In this letter we show that in some asymmetric nanopillars spin current can destabilize both parallel and antiparallel configurations. As a result, stationary precessional modes can occur at zero magnetic field. The corresponding phase diagram as well as frequencies of the precessional modes have been calculated in the framework of macrospin model. The relevant spin transfer torque has been calculated in terms of the macroscopic model based on spin diffusion equations.

4 pages, 4 figures

References in corpus (12)

• Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
• Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
• Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts
• Anatomy of Spin-Transfer Torque
• Mechanisms of spin-polarized current-driven magnetization switching
• Modification of the Landau-Lifshitz Equation in the Presence of a Spin-Polarized Current in CMR and GMR Materials
• Magnetization dynamics with a spin-transfer torque
• The Role of Spin-Dependent Interface Scattering in Generating Current-Induced Torques in Magnetic Multilayers
• Spin-transport in multi-terminal normal metal - ferromagnet systems with non-collinear magnetizations
• Macrospin Models of Spin Transfer Dynamics
• A self-consistent treatment of non-equilibrium spin torques in magnetic multilayers
• Controlled normal and inverse magnetoresistance and current-driven magnetization switching in magnetic nanopillars

Cited by in corpus (17)

• Shaped angular dependence of the spin transfer torque and microwave generation without magnetic field
• Time-Domain Studies of Very-Large-Angle Magnetization Dynamics Excited by Spin Transfer Torques
• Spin torque and waviness in magnetic multilayers: a bridge between Valet-Fert theory and quantum approaches
• Field- and damping-like spin-transfer torque in magnetic multilayers
• Compensation temperature of 3d mixed ferro-ferrimagnetic ternary alloy
• Generation of microwave radiation in planar spin-transfer devices
• Current-induced dynamics in non-collinear dual spin-valves
• Microwave excitations associated with a wavy angular dependence of the spin transfer torque : model and experiments
• Multiscale approach to spin transport in magnetic multilayers
• Thermally Assisted Current-Driven Bistable Precessional Regimes in Asymmetric Spin Valves
• Interplay between non equilibrium and equilibrium spin torque using synthetic ferrimagnets
• Correlation of the angular dependence of spin-transfer torque and giant magnetoresistance in the limit of diffusive transport in spin valves
• Invariant form of spin-transfer switching condition
• Current-pulse-induced magnetic switching in standard and nonstandard spin-valves
• Current-induced dynamics of composite free layer with antiferromagnetic interlayer exchange coupling
• Optimal time-dependent polarized current pattern for fast domain wall propagation in nanowires: Exact solutions for biaxial and uniaxial anisotropies
• Spin-transfer torque in magnetic multilayer nanopillars