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Magneto acoustical emission in nanocrystalline Mn-Zn ferrites

Praveena, K and Murthty, SR (2013) Magneto acoustical emission in nanocrystalline Mn-Zn ferrites. In: MATERIALS RESEARCH BULLETIN, 48 (11). pp. 4826-4833.

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Official URL: http://dx.doi.org/10.1016/j.materresbull.2013.08.0...


Mn0.4Zn0.6Fe2O4 powders were prepared by microwave hydrothermal method. The powders were characterized by X-ray diffraction, transmission electron microscope. The powders were sintered at different temperatures 400, 500, 600, 700, 800 and 900 degrees C/30 min using microwave sintering method. The grain size was estimated by scanning electron microscope. The room temperature dielectric and magnetic properties were studied in the frequency range (100 kHz-1.8 GHz). The magnetization properties were measured upto 1.5 T. The acoustic emission has been measured along the hysteresis loops from 80 K to Curie temperature. It is found that the magneto-acoustic emission (MAE) activity along hysteresis loop is proportional to the hysteresis losses during the same loop. This law has been verified on series of polycrystalline ferrites and found that the law is valid whatever the composition, the grain size and temperature. It is also found that the domain wall creation/or annihilation processes are the origin of the MAE. (C) 2013 Published by Elsevier Ltd.

Item Type: Journal Article
Additional Information: copyright for this article belongs to PERGAMON-ELSEVIER SCIENCE LTD ENGLAND
Keywords: Ceramics; Chemical synthesis; Electron microscopy; Dielectric properties; Magnetic properties
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 23 Dec 2013 05:22
Last Modified: 23 Dec 2013 05:22
URI: http://eprints.iisc.ac.in/id/eprint/47960

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