Authors: Sarangi, S.; Tan, I.C.; Brazdeikis, A.

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 5, May 2011 , pp. 4136-4141(6)

Publisher: American Scientific Publishers

Abstract:

We have investigated and modeled the effect of interaction among magnetic particles and the magnitude and duration of external applied magnetic field on Brownian relaxation in a colloidal suspension. In the case of interacting magnetic particles, Brownian relaxation depends on the interparticle dipole-dipole interaction, which slows down the overall Brownian relaxation process of magnetic particles in the colloidal suspension. The individual magnetic particle experiences torque when a pulsatile magnetic field is applied. The torque due to the external field randomizes the particle rotation similar to that of the thermal energy. A faster Brownian relaxation is observed when individual magnetic particles are magnetized for a short duration. Magnetizing the magnetic particle for a longer duration suppress the rotational motion hence the effect of torque on Brownian relaxation.

Keywords: MAGNETIC NANOPARTICLE COLLOIDS; MAGNETIC RELAXOMETRY; BROWNIAN RELAXATION; SQUID

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2011.4112

Publication date: 2011-05-01

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