Abstract
We report modulated switching current density and spin-orbit torques (SOT) in MnGa/Ta films with inserting very thin Co2FeAl and Co layers. Ferromagnetic coupling has been found in MnGa/Co2FeAl/Ta, resulting in a decreased effective anisotropy field. On the contrary, in MnGa/Co/Ta, antiferromagnetic coupling plays a dominant role. The switching current density Jc in MnGa/Ta is 8.5 × 107 A/cm2. After inserting 0.8-nm-thick Co2FeAl and Co, theJc becomes 5 × 107 A/cm2 and 9 × 107 A/cm2, respectively. By performing adiabatic harmonic Hall voltage measurements, it is demonstrated that the inserted Co2FeAl layer has mainly enhanced the field-like torques, while in MnGa/Co/Ta the damping-like torques have been enhanced. Finally, the enhanced spin Hall effect (SHE) has also been studied using the spin Hall magnetoresistance measurement. The modulated Jc and SOT are ascribed to the combination of magnetic coupling, Rashba effect and SHE at the interfaces.
Highlights
We report modulated switching current density and spin-orbit torques (SOT) in MnGa/Ta films with inserting very thin Co2FeAl and Co layers
We measure the Spin-orbit torques (SOT) induced magnetization switching by applying a pulsed current with the width 50 μs, and the resistance is measured after a 16 μs delay under an external magnetic field HX along either positive or negative X directions
We apply a sinusoidal alternating current (AC) with the amplitude of 2.1 mA and the frequency of 158.89 Hz to exert periodic SOT on the magnetization, and the first Vω and the second V2ω harmonic anomalous Hall voltages are measured as functions of magnetic field H at the same time using two lock-in amplifier systems
Summary
We report modulated switching current density and spin-orbit torques (SOT) in MnGa/Ta films with inserting very thin Co2FeAl and Co layers. The modulated Jc and SOT are ascribed to the combination of magnetic coupling, Rashba effect and SHE at the interfaces. Spin-orbit torques (SOT) effect has been demonstrated as a promising technique to control the magnetization in heavy metal (HM)/ferromagnetic metal (FM) heterostructures[1,2,3,4,5,6,7,8]. The torques acting on the magnetization can be represented by so-called effective magnetic fields generated by the spin Hall effect (SHE) and the Rashba effect[9,10,11,12,13,14,15,16,17,18,19,20]. To evaluate the size and direction of such torques or effective fields, a number of methods have been employed
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