Electrical rectification effect in single domain magnetic microstrips: A micromagnetics-based analysis

Abstract

Upon passing an a.c. electrical current along magnetic micro-or nanostrips, the measurement of a d.c. voltage that depends sensitively on current frequency and applied field has been recently reported by A. Yamaguchi and coworkers. It was attributed to the excitation of spin waves by the spin transfer torque, leading to a time-varying anisotropic magnetoresistance and, by mixing of a.c. current and resistance, to a d.c. voltage. We have performed a quantitative analysis by micromagnetics, including the spin transfer torque terms considered usually, of this situation.The signals found from the spin transfer torque effect are several orders of magnitude below the experimental values, even if a static inhomogeneity of magnetization (the so-called ripple) is taken into account. On the other hand, the presence of a small non-zero average OErsted field is shown to be consistent with the full set of experimental results, both qualitatively and quantitatively.We examine, quantitatively, several sources for this average field and point to the contacts to the sample as a likely origin.

Evaluation of Spin Hall Angle and Spin Diffusion Length by Using Spin Current-Induced Ferromagnetic Resonance

“…For better quantitative evaluation of SH , it is necessary to further clarify the film thickness dependence of SH to account for the effects of an RF current in the FM layer 19,20) and l s in the NM layer.…”

Anomalous Hall voltage rectification and quantized spin-wave excitation induced by simultaneous application of dc and rf currents in a single-layeredNi81Fe19nanoscale wire

“…(35) Eqs. (19)- (21), respectively, which correspond to the terms described in our previous paper 29 .…”

“…Here, the previous approaches have been developed based on the LLG equation, while the 11/42 present treatment includes one additional important aspect; the spin-transfer torque in the SW excitation state gives the precession of the precessional axis of the magnetization itself 29 .…”

Electric-field tunable spin diode FMR in patterned PMN-PT/NiFe structures

“…27 We have omitted here the nonadiabatic term in STT, as its amplitude is usually much smaller than that of the adiabatic term. 28 The averaged magnetic energy U ¼ hUðrÞi includes the shape anisotropy, Zeeman-like terms due to static and dynamic (Oersted) magnetic fields, as well as terms related to the stress due to the deformation of the PMN-PT substrate under external electric field. Bias voltage applied to the PMN-PT (011) oriented substrate generates a tensile and compressive stress along the [01-1] and [100] directions, respectively.…”