Spin dynamics and damping in nanomagnets measured directly by frequency-resolved magneto-optic Kerr effect
Michael L. Schneider, Justin M. Shaw, Anthony B. Kos, Thomas Gerrits, Thomas J. Silva, Robert D. McMichael
The spin dynamics of sub-100 nm Ni80Fe20 nanomagnets are directly measured using the magneto-optic Kerr effect and a broadband detection scheme. Elliptical dots approximately 68nm in diameter and 10 nm thick were fabricated in 20x20υm^2^ arrays. There is approximately a factor of 2 increase in the effective linewidth when compared to a 20 υm^2^ diameter continuous disk of the same material. Using micromagnetic simulations, we model the effect of dot-to-dot size variation on the effective linewidth and find that 2 nm size variations are more than sufficient to account for the effective increase in linewidth.