Field- and damping-like spin-transfer torque in magnetic multilayers

Abstract

We investigate the spin-transfer torque in a magnetic multilayer structure by means of a spin-diffusion model. The torque in the considered system, consisting of two magnetic layers separated by a conducting layer, is caused by a perpendicular-to-plane current. We compute the strength of the field-like and the damping-like torque for different material parameters and geometries. Our studies suggest that the field-like torque highly depends on the exchange coupling strength of the itinerant electrons with the magnetization both in the pinned and the free layer. While a low coupling leads to very high field-like torques, a high coupling leads to low or even negative field-like torques. The dependence of the different torque terms on system parameters is considered very important for the development of applications such as STT MRAM and spin-torque oscillators.

References in corpus (7)

• Spin Transfer Torques
• Spin torque building blocks
• CPP Magnetoresistance of Magnetic Multilayers: A critical review
• Current-driven destabilization of both collinear configurations in asymmetric spin-valves
• Implementation of a non-equilibrium Green's function method to calculate spin transfer torque
• Thermally Assisted Current-Driven Bistable Precessional Regimes in Asymmetric Spin Valves
• Current-induced switching of magnetic tunnel junctions: Effects of field-like spin-transfer torque, pinned-layer magnetization orientation and temperature

Cited by in corpus (6)

• Spin-transfer and spin-orbit torques in the Landau-Lifshitz-Gilbert equation
• Sign reversal of field like spin-orbit torque in ultrathin Chromium/Nickel bilayer
• Back hopping in spin-transfer-torque devices, possible origin and counter measures
• Micromagnetic view on ultrafast magnon generation by femtosecond spin current pulses
• Electrical generation and detection of terahertz signal based on spin-wave emission from ferrimagnets
• Single device offset-free magnetic field sensing principle with tunable sensitivity and linear range based on spin-orbit-torques