Field- and temperature-modulated spin diode effect in a GMR nanowire with dipolar coupling

Abstract

An analytical model of the spin-diode effect induced by resonant spin-transfer torque in a ferromagnetic bilayer with strong dipolar coupling provides the resonance frequencies and the lineshapes of the magnetic field spectra obtained under field or laser-light modulation. The effect of laser irradiation is accounted for by introducing the temperature dependence of the saturation magnetization and anisotropy, as well as thermal spin-transfer torques. The predictions of the model are compared with experimental data obtained with single Co/Cu/Co spin valves, embedded in nanowires and produced by electrodeposition. Temperature modulation provides excellent signal-to-noise ratio. High temperature-modulation frequency is possible because these nanostructures have a very small heat capacity and are only weakly heat-sunk. The two forms of modulation give rise to qualitative differences in the spectra that are accounted for by the model. 76.50.+g, 75.47.De

Holographic vector field electron tomography of three-dimensional nanomagnets

“…4c), which indicates that the magnetization amplitude and most probably the exchange constant for each layer can be decreased even further. Such low values of magnetic constants due to the Cu impurities in the Co layers were also observed in a recent work [33] on electrodeposited Co/Cu multilayers grown in a single bath, especially when decreasing the thickness of the layer.…”

Structural, magnetostatic, and magnetodynamic studies of Co/Mo-based uncompensated synthetic antiferromagnets

“…The exchange constant for all Co layers was taken as A ex = 3 × 10 −11 J/m. The dynamics simulation scheme is similar to the one used in our previous works [41,43]. It starts from the state of fully relaxed magnetization of Co/Mo superlattice.…”