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Proceedings Paper

Magneto-optic evaluation of antiferromagnetic α-Fe2O3 nanoparticles coated on a quartz substrate
Author(s): Srinath Balasubramanian; Rajendra Panmand; Ganapathy Kumar; Satish M. Mahajan; Bharat B. Kale
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Paper Abstract

This paper presents a prima facie study of the magneto-optic response of antiferromagnetic α-Fe2O3 nanoparticles coated on a quartz substrate investigated by MOKE. The concentrations of the iron oxide nanoparticles in the films were varied from 8.6% to 21.5% and showed a linear increase in film thicknesses. As the concentration of the iron oxide nanoparticles were increased, the samples changed from a net-like morphology to a crystalline morphology. Magnetization reversals in the lower concentration samples were asymmetric with the reversals for the ascending and descending branch of the hysteresis loop occurring on the same side. The asymmetry in the magnetization reversal was attributed to the angle between the antiferromagnetic easy axis and the external magnetic field. With increase in concentration, an improvement in the magneto-optic response was observed with the magnetization reversal occurring via coherent rotation for both ascending and descending branches of the hysteresis loop. The changes in the magneto-optic behavior for the samples with higher concentrations is attributed to the strong exchange interactions and changes in the shape of the nanoparticles. Sensitivity studies performed on the samples showed an increased magneto-optic sensitivity to changes in magnetic field for samples of higher concentration. The high sensitivity of these samples could be exploited in magneto-optic sensors. Nanoparticles on a quartz substrate could find applications in bio-medicine due to their bio-compatibility.

Paper Details

Date Published: 15 March 2016
PDF: 12 pages
Proc. SPIE 9758, Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIII, 97580O (15 March 2016); doi: 10.1117/12.2209003
Show Author Affiliations
Srinath Balasubramanian, Tennessee Technological Univ. (United States)
Rajendra Panmand, Ctr. for Materials for Electronics Technology (India)
Ganapathy Kumar, Tennessee Technological Univ. (United States)
Satish M. Mahajan, Tennessee Technological Univ. (United States)
Bharat B. Kale, Ctr. for Materials for Electronics Technology (India)


Published in SPIE Proceedings Vol. 9758:
Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIII
Diana L. Huffaker; Holger Eisele; Kimberly A. Dick, Editor(s)

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