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Effect of Mn substitution on the magnetic and magneto-transport properties of Fe3-xMnxSi (0 <= x <= 1.25) alloys

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Title Effect of Mn substitution on the magnetic and magneto-transport properties of Fe3-xMnxSi (0
 
Creator PAL, L
SURESH, KG
NIGAM, AK
 
Subject TRANSITION-METAL SOLUTES
HEUSLER ALLOYS
SITE PREFERENCE
ELECTRICAL-RESISTIVITY
ELECTRONIC-STRUCTURE
HYPERFINE FIELDS
BAND-STRUCTURE
FE3SI
MOMENTS
 
Description Effect of partial Mn substitution for Fe in Fe3Si on the structural, magnetic, transport, and magnetotransport properties has been studied. Mn substitution is found to induce a re-entrant antiferromagnetic phase at low temperatures. The increase in the antiferromagnetic exchange causes a gradual decrease in the Curie temperature and the saturation magnetization. Temperature dependence of the electrical resistivity data shows that the high temperature resistivity is dominated by electron-phonon scattering, while below the re-entry temperature (T-R), electron-magnon scattering is dominant. These results are in agreement with the reported spin polarization studies and indicate that the reentrant behavior is detrimental to half metallicity. Application of a field causes negative magnetoresistance (MR) above TR. However, at 5K, the magnetoresistance is found to be positive, with the magnitude increasing with x. For x>0.8, field induced irreversibility has been found in MR vs. field isotherms at 5 K, which indicates that the re-entrant phase has competing magnetic interactions. Canted magnetic structure known to exist in this system is assumed to be responsible for this anomalous behaviour. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4794126]
 
Publisher AMER INST PHYSICS
 
Date 2014-10-15T13:50:59Z
2014-10-15T13:50:59Z
2013
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 113(9)
http://dx.doi.org/10.1063/1.4794126
http://dspace.library.iitb.ac.in/jspui/handle/100/15030
 
Language en