Grain size effect on the magnetic properties of Sm0.08Ca0.92MnO3 manganite

Goveas, LR and Anuradha, KN and Bhat, SV (2018) Grain size effect on the magnetic properties of Sm0.08Ca0.92MnO3 manganite. In: 2nd International Conference on Large Area Flexible Microelectronics, ILAFM 2016, 20 - 22 December 2016, Bengaluru, pp. 10747-10754.

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Abstract

Here we present a comparative study of the temperature dependent magnetic properties of nanosized and bulk samples of Sm0.08Ca0.92MnO3 (SCMO) manganite. Nanoparticles of SCMO (mean diameter ∼ 27, 22 and 16 nm) were synthesized by sol-gel technique and the bulk samples were obtained by sintering the nanoparticles at high temperatures. The samples were characterized by X-ray powder diffraction, energy dispersive X-ray analysis and transmission electron microscopy. The magnetic properties were studied by SQUID magnetometer and Electron magnetic resonance (EMR) spectroscopy. Temperature dependence of dc-magnetization showed that the nanoparticles underwent ferromagnetic transition at 103 K where as the bulk sample showed the same at 105 K. The field cooled curve shows that the magnetization decreases with the size reduction. The EMR studies substantiate the presence of ferromagnetism in the bulk sample as well as in nanosamples but with a weakened strength in nanosamples. In manganites linewidth shows a characteristic minimum near 1.1 TC where TC is the FM transition temperature. We observe this minimum becomes less shallow as the size decreases. The behaviour of the nanoparticles is ascribed to core shell model; reduction of magnetization in the nanoparticles is due to uncompensated surface spin.

Item Type:	Conference Paper
Publication:	Materials Today: Proceedings
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Electron magnetic resonance; Manganites; Nanoparticles
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	19 Aug 2022 06:02
Last Modified:	19 Aug 2022 06:02
URI:	https://eprints.iisc.ac.in/id/eprint/76007

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