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Title: Structural properties and large coercivity of bulk Mn{sub 3−x}Ga (0 ≤ x ≤ 1.15)

The tetragonal DO{sub 22} phase of the Mn{sub 3−x}Ga compounds, with x varying from 0 to 1.15, has been successfully synthesized by annealing the ingots with the cubic γ-phase. It is found that the lattice parameter a of the tetragonal cell remains almost constant, while the lattice parameter c increases significantly as x varies from 0 to 1.15. In the meantime, the magnetization of Mn{sub 3−x}Ga (at 7 T) increases dramatically with increasing x. A substitution model, which is different to the model with manganese vacancies, is proposed to explain these changes. According to this model, the increase of the lattice parameter c and the magnetization with x can be explained by an assumption that Mn atoms at 2b sites are preferentially substituted by larger and nonmagnetic Ga atoms. A coercivity which is higher than that of other bulk Mn{sub 3−x}Ga alloys ever reported is achieved. Coercivities as large as iHc = 21.4 kOe and 18.2 kOe are obtained for Mn{sub 3.0}Ga at 5 K and 300 K, respectively.
Authors:
; ; ; ; ; ;  [1] ;  [1] ;  [2]
  1. School of Physics, Peking University, Beijing 100871 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22273781
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; ATOMS; COERCIVE FORCE; CONCENTRATION RATIO; EV RANGE; GALLIUM; INTERMETALLIC COMPOUNDS; LATTICE PARAMETERS; MAGNETIZATION; MANGANESE; TETRAGONAL LATTICES; VACANCIES