Magnetic Field Dependence of Brownian Motion in Iron-oxide Nanoparticles Jung, Eun Kyung; Yoon, Seok Soo; Kim, Dong Young;
The ac magnetic susceptibility was measured in iron-oxide nanoparticles with average size of 26 nm, which were uniformly dispersed in organic solvent. The ac magnetic susceptibility measured under zero magnetic fields was well fitted with Debye relaxation model and the relaxation frequency was 370 Hz. The relaxation frequency of the nanoparticles coincided with relaxation time of the Brownian motion, which is due to the viscosity of the liquid medium in which magnetic nanoparticles dwell. The Brown relaxation frequencies were linearly increased with magnetic field.
nanoparticles;Ac magnetic susceptibility;brownian motion;relaxation frequency;
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