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.
Citation: Physical Review Letters
Pub Type: Journals
magnetic nano-dots, magneto optics, magnetodynamics