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Effect of Gd-substitution at Y-site on the structural, magnetic and dielectric properties of Y1-xGdxMnO3 (x=0, 0.05) nanoparticles

Published online by Cambridge University Press:  15 September 2014

Samta Chauhan ,
Saurabh Kumar Srivastava ,
Amit Singh Rajput  and
Ramesh Chandra
Samta Chauhan
Affiliation:
Nanoscience Laboratory, Institute Instrumentation Centre, Indian Institute of Technology Roorkee, Roorkee-247667, India
Saurabh Kumar Srivastava
Affiliation:
Nanoscience Laboratory, Institute Instrumentation Centre, Indian Institute of Technology Roorkee, Roorkee-247667, India
Amit Singh Rajput
Affiliation:
Nanoscience Laboratory, Institute Instrumentation Centre, Indian Institute of Technology Roorkee, Roorkee-247667, India Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee-247667, India
Ramesh Chandra*
Affiliation:
Nanoscience Laboratory, Institute Instrumentation Centre, Indian Institute of Technology Roorkee, Roorkee-247667, India
*
*Corresponding author Email: ramesfic@iitr.ernet.in
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Abstract

Effect of Gd substitution at Y-site on the structural and magnetic properties of Y1-xGdxMnO3 (x=0, 0.05) nanoparticles prepared by conventional solid state reaction method has been studied. The structural study using X-ray diffraction pattern indicates the hexagonal structure with P63cm space group for all the samples. The average particle size for all the samples lies in the range of 30-40 nm as confirmed by X-ray diffraction and transmission electron microscopy analysis. The change in a and c lattice parameters confirm the substitution of Gd at Y-site. Magnetization versus temperature measurements show enhanced magnetic moment and an increase in Neel temperature with Gd-doping. Spin glass behavior is observed at low temperature in all the samples. Exchange bias effect has been observed at 5 K after field cooling the samples which is ascribed to the formation of antiferromagnetic-ferromagnetic (AFM-FM) core-shell structure of the nanoparticles. A significant improvement in the dielectric properties of Gd-doped samples has also been observed.

Keywords

magneticdielectric propertiesnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1675: Symposium K/RR – Synthesis, Characterization and Applications of Functional Materials—Thin Films and Nanostructures , 2014 , pp. 121 - 128
Copyright
Copyright © Materials Research Society 2014 

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