Adjustable spin torque in magnetic tunnel junctions with two fixed layers
arXiv:cond-mat/0503376 · doi:10.1063/1.1899764
Abstract
We have fabricated nanoscale magnetic tunnel junctions (MTJs) with an additional fixed magnetic layer added above the magnetic free layer of a standard MTJ structure. This acts as a second source of spin-polarized electrons that, depending on the relative alignment of the two fixed layers, either augments or diminishes the net spin-torque exerted on the free layer. The compound structure allows a quantitative comparison of spin-torque from tunneling electrons and from electrons passing through metallic spacer layers, as well as analysis of Joule selfheating effects. This has significance for current-switched magnetic random access memory (MRAM), where spin torque is exploited, and for magnetic sensing, where spin torque is detrimental.
3 pages, 2 figures, to appear in Appl. Phys. Lett
References in corpus (7)
- Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
- Observation of spin-transfer switching in deep submicron-sized and low-resistance magnetic tunnel junctions
- Currents, Torques, and Polarization Factors in Magnetic Tunnel Junctions
- Thermally assisted magnetization reversal in the presence of a spin-transfer torque
- Spin-Transfer Effects in Nanoscale Magnetic Tunnel Junctions
- Thermally-Activated Magnetic Reversal Induced by a Spin-Polarized Current
- Temperature dependence of spin-transfer-induced switching of nanomagnets
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- Sensitivity of spin-torque diodes for frequency-tunable resonant microwave detection
- Spin torque, tunnel-current spin polarization and magnetoresistance in MgO magnetic tunnel junctions
- Thermal Relaxation Rates of Magnetic Nanoparticles in the Presence of Magnetic Fields and Spin-Transfer Effects
- Spin-Polarized Current Induced Torque in Magnetic Tunnel Junctions
- Enhancement in spin-torque efficiency by nonuniform spin current generated within a tapered nanopillar spin valve
- Ultrafast Spin-Transfer-Torque Switching of Synthetic Ferrimagnets
- Steady State and Dynamics of Joule Heating in Magnetic Tunnel Junctions Observed via the Temperature Dependence of RKKY Coupling
- Analytic expression of the temperature increment in a spin transfer torque nanopillar structure
- Optimal control of magnetization dynamics in ferromagnetic heterostructures by spin--polarized currents
- Diffusive model of current-in-plane-tunneling in double magnetic tunnel junctions
- Spin transfer torque enhancement in dual spin valve in the ballistic regime
- Spin transfer in a ferromagnet-quantum dot and tunnel barrier coupled Aharonov-Bohm ring system with Rashba spin-orbit interactions