Influence of thermal gradients and spin currents on current driven domain wall motion

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We have studied the effect of temperature gradient and/or spin wave application to reduce the threshold current density needed to move a magnetic domain wall, or to increase the wall velocity. Using joule heating to locally heat a conductor, we developed a system that has temperature gradient of 0.2K/5 um. Spin wave excitations and its detection was carried out using high frequency electrical measurements. Incidentally, we find that the domain wall nucleation field was reduced when a localized microwave field, near to the ferromagnetic resonance frequency, was applied. However, the field driven domain wall velocity showed little dependence on the application of the propagating spin waves.