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

Journal Article · Tue Apr 21 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4918664· OSTI ID:22402868

Nelson, A.; Huh, Y.; Fuglsby, R.; Guenther, J. ^[1]; Zhang, W.; Sellmyer, D. J. ^[2]; Staten, B.; Lukashev, P. ^[3]; Valloppilly, S. ^[2]

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1. Department of Physics, South Dakota State University, Brookings, South Dakota 57007 (United States)
2. Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588 (United States)
3. Department of Physics, University of Northern Iowa, Cedar Falls, Iowa 50614 (United States)

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.

• OSTI ID: 22402868
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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