Spin-orbit torque induced magnetisation dynamics and switching in CoFeB/Ta/CoFeB system with mixed magnetic anisotropy

Abstract

Spin-orbit torque (SOT) induced magnetisation switching in CoFeB/Ta/CoFeB trilayer with two CoFeB layers exhibiting in-plane magnetic anisotropy (IPMA) and perpendicular magnetic anisotropy (PMA) is investigated. Interlayer exchange coupling (IEC), measured using ferromagnetic resonance technique is modified by varying thickness of Ta spacer. The evolution of the IEC leads to different orientation of the magnetic anisotropy axes of two CoFeB layers: for thicker Ta layer where magnetisation prefers antiferromagnetic ordering and for thinner Ta layer where ferromagnetic coupling exists. Magnetisation state of the CoFeB layer exhibiting PMA is controlled by the spin-polarized current originating from SOT in $\mu m$ sized Hall bars. The evolution of the critical SOT current density with Ta thickness is presented, showing an increase with decreasing $t_{\mathrm{Ta}}$, which coincides with the coercive field dependence. In a narrow range of $t_{\mathrm{Ta}}$ corresponding to the ferromagnetic IEC, the field-free SOT-induced switching is achieved.

References in corpus (19)

• Spin torque switching with the giant spin Hall effect of tantalum
• Magnetic switching by spin torque from the spin Hall effect
• Current-driven dynamics of chiral ferromagnetic domain walls
• Switching of perpendicular magnetization by spin-orbit torques in the absence of external magnetic fields
• Magnetization switching by spin-orbit torque in an antiferromagnet/ferromagnet bilayer system
• Observation of spin-transfer switching in deep submicron-sized and low-resistance magnetic tunnel junctions
• Spin-orbit torques induced by interface-generated spin currents
• Room-temperature perpendicular magnetization switching through giant spin-orbit torque from sputtered BixSe(1-x) topological insulator material
• Switching of Perpendicularly Polarized Nanomagnets with Spin Orbit Torque without an External Magnetic Field by Engineering a Tilted Anisotropy
• Single-shot dynamics of spin-orbit torque and spin transfer torque switching in three-terminal magnetic tunnel junctions
• Electrical Detection of Magnetization Dynamics via Spin Rectification Effects
• Shape anisotropy revisited in single-digit nanometer magnetic tunnel junctions
• Strong Spin Hall Effect in the Antiferromagnet PtMn
• Field-free Magnetization Switching by Utilizing the Spin Hall Effect and Interlayer Exchange Coupling of Iridium
• Field-free switching of magnetic tunnel junctions driven by spin-orbit torques at sub-ns timescales
• Anomalous spin Hall magnetoresistance in Pt/Co bilayers
• Field-free spin-orbit torque switching in Co/Pt/Co multilayer with mixed magnetic anisotropies
• Current-induced magnetization switching of exchange-biased NiO heterostructures characterized by spin-orbit torque
• Inductive determination of the optimum tunnel barrier thickness in magnetic tunnelling junction stacks for spin torque memory applications

Cited by in corpus (2)

• Spin Hall Induced Magnetization Dynamics in Multiferroic Tunnel Junction
• Numerical Model Of Harmonic Hall Voltage Detection For Spintronic Devices