Magnetic Nanoparticles: A Subject for Both Fundamental Research and Applications

Figure 15

(a) Experimental time-resolved Kerr rotations and (b) the corresponding FFT spectra are shown for arrays of permalloy dots with width=50 nm, thickness=20 nm, and with varying interdot separation 𝑆 at 𝐻=2.5 kOe. (c) The FFT spectra of the simulated time-resolved magnetization are shown. The peak numbers are assigned to the FFT spectra. The dotted line in (c) shows the simulated precession frequency of a single permalloy dot with width=50 nm and thickness=20 nm. Reproduced with permission from Rana et al. [163] © 2011, American Chemical Society.

(a)

(b)

(c)