Magneto-optic evaluation of antiferromagnetic [alpha]-Fe2O3 nanoparticles coated on a quartz substrate

Srinath Balasubramanian; Rajendra Panmand; Ganapathy Kumar; Satish M. Mahajan; Bharat B. Kale

doi:10.1117/12.2209003

15 March 2016 Magneto-optic evaluation of antiferromagnetic α-Fe₂O₃ nanoparticles coated on a quartz substrate

Srinath Balasubramanian, Rajendra Panmand, Ganapathy Kumar, Satish M. Mahajan, Bharat B. Kale

Proceedings Volume 9758, Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIII; 97580O (2016) https://doi.org/10.1117/12.2209003
Event: SPIE OPTO, 2016, San Francisco, California, United States

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.

Citation Download Citation

Srinath Balasubramanian, Rajendra Panmand, Ganapathy Kumar, Satish M. Mahajan, and Bharat B. Kale "Magneto-optic evaluation of antiferromagnetic α-Fe₂O₃ nanoparticles coated on a quartz substrate", Proc. SPIE 9758, Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIII, 97580O (15 March 2016); https://doi.org/10.1117/12.2209003

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