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Title: Enhancement of Curie temperature in Mn{sub 2}RuSn by Co substitution

The Co-substituted Mn{sub 2}RuSn nanomaterials, namely, Mn{sub 2}Ru{sub 0.5}Co{sub 0.5}Sn and Mn{sub 2}Ru{sub 0.35}Co{sub 0.65}Sn have been synthesized and investigated. The presence of Co in the Mn{sub 2}RuSn (a = 6.21 Å) decreased the lattice parameter, where a = 6.14 Å and 6.12 Å for the as prepared Mn{sub 2}Ru{sub 0.5}Co{sub 0.5}Sn and Mn{sub 2}Ru{sub 0.35}Co{sub 0.65}Sn, respectively. The samples show a ferrimagnetic spin order with relatively small coercivities, similar to those of soft magnetic materials. There is a substantial increase in the Curie temperature (T{sub c} = 448 K for Mn{sub 2}Ru{sub 0.5}Co{sub 0.5}Sn and 506 K for Mn{sub 2}Ru{sub 0.35}Co{sub 0.65}Sn) of Mn{sub 2}RuSn (T{sub c} = 272.1 K) due to Co substitution, which is a result of strengthening of the positive exchange interaction in this material. These materials are highly stable against heat treatment of up to 450 °C. The first-principles calculations are consistent with our experimentally observed structural and magnetic properties. They also provide insight on how the magnetic and electronic structures change when Ru is replaced with Co in Mn{sub 2}RuSn.
Authors:
; ; ;  [1] ;  [1] ;  [2] ; ;  [3] ;  [2] ; ;  [4] ;  [3]
  1. Department of Physics, South Dakota State University, Brookings, South Dakota 57007 (United States)
  2. (United States)
  3. Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588 (United States)
  4. Department of Physics, University of Northern Iowa, Cedar Falls, Iowa 50614 (United States)
Publication Date:
OSTI Identifier:
22402868
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 15; Other Information: (c) 2015 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; COBALT COMPOUNDS; COERCIVE FORCE; CURIE POINT; ELECTRONIC STRUCTURE; EXCHANGE INTERACTIONS; FERRIMAGNETISM; HEAT TREATMENTS; LATTICE PARAMETERS; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; MANGANESE COMPOUNDS; NANOMATERIALS; RUTHENIUM COMPOUNDS; SPIN; TIN COMPOUNDS