Narrow Results

The dependence of spin relaxation on the direction of the quantum wire under Rashba and Dresselhaus (linear and cubic) spin-orbit coupling is studied. Comprising the dimensional reduction of the wire in the diffusive regime, the lowest spin relaxation and dephasing rates for (001) and (110) systems are found.

Effects of spin–orbit coupling (SOC) on magnetocrystalline anisotropy, magneto-optical Kerr effect (MOKE), magnetic damping parameter and anomalous Hall effect (AHE) have been studied in theory extensively. In contrast, few experimental reports have appeared on these issues. In this review paper, we introduce our recent experimental investigation on the SOC tuning effects on the perpendicular magnetic anisotropy, polar MOKE, intrinsic magnetic damping parameter and AHE in L1₀ ordered ${\mathrm{Fe}}_{0.5}{\left({\mathrm{Pd}}_{1-x}{\mathrm{Pt}}_x\right)}_{0.5}$ ternary alloys. We also outline the SOC effects in polycrystalline disordered ${\mathrm{Fe}}_{0.5}{\left({\mathrm{Pd}}_{1-x}{\mathrm{Pt}}_x\right)}_{0.5}$ films for comparison.

The spin–orbit coupling spin torque consists of the field-like [S. G. Tan et al., arXiv:0705.3502 (2007).] and the damping-like terms [H. Kurebayashi et al., Nat. Nanotechnol.9, 211 (2014).] that have been widely studied for applications in magnetic memory. We focus, in this paper, not on the spin–orbit effect producing the above spin torques, but on its magnifying the damping constant of all field-like spin torques. As first-order precession leads to second-order damping, the Rashba constant is naturally co-opted, producing a magnified field-like damping effect. The Landau–Liftshitz–Gilbert equations are written separately for the local magnetization and the itinerant spin, allowing the progression of magnetization to be self-consistently locked to the spin.

The dependence of spin relaxation on the direction of the quantum wire under Rashba and Dresselhaus (linear and cubic) spin-orbit coupling is studied. Comprising the dimensional reduction of the wire in the diffusive regime, the lowest spin relaxation and dephasing rates for (001) and (110) systems are found.