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

Spin Hall Induced Magnetization Dynamics in Multiferroic Tunnel Junction

“…Energy dispersive X‐ray spectroscopy (EDX) (Figure 1d) shows profiles characteristic for each element, with sharp interfaces between LSMO, BTO, and Co and some degree of intermixing between Co and Pt, which was also reported previously. [ 24 ]…”

“…As expected, the effective magnetization of Co decreases with the layer thickness from around M eff = 0.55 T for t Co = 2.8 nm down to M eff = 0.15 T for t Co = 1 nm. Unlike with the sample covered with MgO, [ 24 ] effective perpendicular magnetic anisotropy in Co is absent (see for the detailed analysis). The example of a second harmonic Hall voltage measurement ($$V_{\mathrm{2\omega }}$$) [ 25 ] as a function of the in‐plane magnetic field angle (ϕ) in the Co(3)/Pt(5) bilayer presented in Figure 2c exhibits a characteristic dependence that was fitted with Equation: $$$$\begin{equation} V_{\mathrm{2\omega }} = -V_B\cos \varphi \cos 2\varphi - V_A\cos \varphi \end{equation}$$$$where V B and V A are the amplitudes of the terms proportional to the planar and anomalous Hall effects (AHE).…”

“…The spin Hall efficiency of the Co/Pt bilayer was determined in the Hall‐cross geometry, with a current flowing in the Co/Pt plane using the angular dependent harmonic Hall voltage measurement [ 21 ] in the rotating probe‐station co‐developed with Measline Ltd. The spin‐orbit torque ferromagnetic resonance (SOT‐FMR) [ 22 ] was determined also in the current in‐plane configuration, both using the two‐ [ 15 ] and four‐point (transverse) [ 23 ] geometry. The RF power applied to the device was fixed to 20 dBm.…”

“…As expected, the effective magnetization of Co decreases with the layer thickness from around M eff = 0.55 T for t Co = 2.8 nm down to M eff = 0.15 T for t Co = 1 nm. Unlike with the sample covered with MgO, [24] effective perpendicular magnetic anisotropy in Co is absent (see Supporting Information for the detailed analysis). The example of a second harmonic Hall voltage measurement (V 2𝜔 ) [25] as a function of the in-plane magnetic field angle (𝜙) in the Co(3)/Pt(5) bilayer presented in Figure 2c exhibits a characteristic dependence that was fitted with Equation:…”

L1$_0$ FePt thin films with tilted and in-plane magnetic anisotropy: first-principles study

“…At the same time, it was confirmed that tilting the magnetization direction to 45 • minimizes the value of the switching field [36]. Since then, several other ways of achieving a film with tilted magnetization have been considered, such as ferromagnetic coupling of a tilted top Co layer with an in-plane magnetized bottom Co layer [38]. Much attention has been paid in particular to L1 0 FePt and CoPt films [32,39], which can be deposited on the substrate in such a way that the unique tetragonal axis is strongly deviated from the plane of the film, as in the case of the growth of the FePt films with a (111) surface [33,34,40,41].…”