Jain, Komal and Pathak, Saurabh and Kumar, Prashant and Singh, Arjun and Pant, R. P. (2019) Dynamic magneto-optical inversion in magnetic fluid using NanoMOKE. Journal of Magnetism and Magnetic Materials, 475. pp. 782-786. ISSN 0304-8853

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Abstract

Systematic inversion of optical anisotropy with magnetic field sweep (0-5000 Gauss) has been observed at a critical concentration in the monodispersed magnetic fluids using NanoMOKE III. This experimental technique is significantly novel method to investigate the optical anisotropy of magnetic nano-suspensions with the time-varying magnetic field. In this work, we report a detailed experimental investigation on the field dependent magneto-optical behaviour of dilute water dispersed Fe3O4 based magnetic fluid. Magnetic fluid shows tunable magneto-optical properties which primarily depends on parameters such as, particle concentration, composition and carrier medium. We have observed a systematic inversion in optical anisotropy at critical concentration for a Fe3O4 magnetic fluid with strong spatial dependence. The observed tuneable magneto-optical phenomena have been correlated to the net effect of the structuration process, electronic transitions and gravitational force in the presence magnetic field. This phenomenon leads to the development of two particle size distribution, negative optical activity initially and strong spatial dependence respectively. The present results provide a strong correlation with theoretical models presented to expound the dependency of various parameters on magneto-optical inversion behaviour of magnetic fluids.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	02 Mar 2020 11:38
Last Modified:	02 Mar 2020 11:38
URI:	http://npl.csircentral.net/id/eprint/4162

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