Enhancement of Curie temperature in Mn2RuSn by Co substitution

Authors

A Nelson, South Dakota State University
Parashu Kharel, South Dakota State University, University of Nebraska-LincolnFollow
Yung Huh, South Dakota State UniversityFollow
R Fuglsby, South Dakota State University
J Guenther, South Dakota State University
Wenyong Zhang, University of Nebraska-LincolnFollow
B Staten, University of Nothern Iowa
Pavel V. Lukashev, University of Nothern IowaFollow
David J. Sellmyer, University of Nebraska at LincolnFollow

Date of this Version

2015

Citation

JOURNAL OF APPLIED PHYSICS 117, 153906 (2015)

Comments

Copyright 2015 Used by permission

Abstract

The Co-substituted Mn2RuSn nanomaterials, namely, Mn2Ru0.5Co0.5Sn and Mn2Ru0.35Co0.65Sn have been synthesized and investigated. The presence of Co in the Mn2RuSn (a¼6.21A ° ) decreased the lattice parameter, where a¼6.14A ° and 6.12A ° for the as prepared Mn2Ru0.5Co0.5Sn and Mn2Ru0.35Co0.65Sn, 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 (Tc¼448K for Mn2Ru0.5Co0.5Sn and 506K for Mn2Ru0.35Co0.65Sn) of Mn2RuSn (Tc¼272.1 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 Mn2RuSn.