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. Author manuscript; available in PMC: 2009 Jul 14.
Published in final edited form as: J Magn Magn Mater. 2009;321(10):1548–1551. doi: 10.1016/j.jmmm.2009.02.083

Fig. 3.

Fig. 3

Magnetization and harmonic response for magnetite nanoparticles subject to an applied field of 10 mT, at 50 kHz. The effective relaxation time is calculated for each size using K = 25 kJ/m3 and a surfactant layer thickness of 23 nm. (a) M(t) vs. particle size, (b) Fourier spectrum of M(t) vs. particle size, (c) M(t) for increasingly broad particle size-distributions, where the median diameter is 14 nm, and (d) Fourier transform of M(t) including size-distribution.