Understanding Nanoscale Temperature Gradients in Magnetic Nanocontacts

摘要: We have determined the temperature profile in magnetic nanocontacts under applied current densities typical of spin-torque oscillators (∼10^8 A/cm^2). The study combines experimental measurements electrical and properties full three-dimensional simulations heat flow these systems. It is found that quadratic current-induced increase resistance due to Joule heating independent from 6 300 K. In terms magnetization dynamics, measured vortex nucleation, a thermally activated process, be consistent with local temperatures increases between 147 225 Simulations reproduce findings show significant thermal gradients exist out 450 nm nanocontact.