  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.
