Controlled exchange bias behavior of manganese nanoparticles

Tiwari, G and Vinod, CP and Jagirdar, BR (2022) Controlled exchange bias behavior of manganese nanoparticles. In: Journal of Magnetism and Magnetic Materials, 559 .

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Abstract

Mn(0) colloids were synthesized by solvated metal atom dispersion approach utilizing hexadecylamine, toluene, and THF as coordinating ligands. Mn-toluene and Mn-THF nanoparticles were found to be highly pyrophoric in nature and demand careful handling whereas, Mn-HDA nanoparticles undergo slow oxidation. TEM micrographs revealed formation of nanoparticles between 3 and 6 nm. Magnetic studies of these three samples displayed shift in the field-cooled M−H hysteresis loop which has been attributed to exchange bias behavior. The exchange bias field, HE measured at 5 K varies with change in coordinating ligands around the Mn center which are 1217 Oe, 4408 Oe and, 6350 Oe for Mn-HDA, Mn-toluene and Mn-THF nanoparticles, respectively. The large exchange bias field has been attributed to the presence of uncompensated antiferromagnetic surface spins and the exchange interactions at the nanoparticle surface due to surface oxidation.

Item Type:	Journal Article
Publication:	Journal of Magnetism and Magnetic Materials
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to the Elsevier B.V.
Keywords:	Antiferromagnetism; Ferromagnetism; Ligands; Magnetic materials; Nanomagnetics; Nanoparticles; Toluene; Transmission electron microscopy, Coordinating ligands; Exchange bias; Exchange bias behaviors; Exchange-bias fields; Hexadecylamine; Manganese nanoparticle; Slow oxidation; Solvated metal atom dispersions; Synthesised; Uncompensated spin, Manganese
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	29 Jun 2022 07:19
Last Modified:	29 Jun 2022 07:19
URI:	https://eprints.iisc.ac.in/id/eprint/73958

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