Perween, Sonam and Rathi, A. and Babu, P. D. and Gupta, Govind and Sivaiah, B. and Pant, R. P. and Gahtori, - and Basheed, G. A. (2019) Enhanced hard magnetic properties in partially-doped Mn3-xGdxGa (x <= 0.03). Journal of Magnetism and Magnetic Materials, 473. pp. 278-283. ISSN 0304-8853

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Abstract

The effect of partial (1-3%) rare-earth Gadolinium doping in D0(22 )Mn(3)Ga hard magnet has been investigated in this work. The Mn 3 Ga undergoes magnetic transition at T-c similar to 745 K, which decreases down to T-c similar to 715 K upon 1% Gd-doping with introduction of mixed Mn valence states, as revealed from XPS study. The hard magnetic behavior of Mn3Ga has been observed in a wide temperature range (up to T-c ). More importantly, the partial Gd-doping significantly enhances the room temperature hard magnetic properties i.e. squareness ratio (m(r)/m(s)), coercivity (H-c) and energy product (BHmax ) from 0.43, 2.73 kOe and 0.39 MGOe (Mn3Ga) to 0.57, 4.25 kOe and 0.5 MGOe (Mn2.97Gd0.03Ga), respectively. The modified Stoner-Wohlfarth model and low-field minor loop analysis reveal the nucleation hardening mechanism for the magnetization reversal. The study proposes the partial rare-earth doping as a new approach to enhance the hard magnetic properties of rare-earth free hard magnets.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier. .
Subjects:	Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	02 Mar 2020 11:31
Last Modified:	02 Mar 2020 11:31
URI:	http://npl.csircentral.net/id/eprint/4178

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