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Room Temperature Ferromagnetism and Lack of Ferroelectricity in Thin Films of ‘Biferroic’ YbCrO3

Published online by Cambridge University Press:  31 January 2011

Sandeep Nagar ,
K. V. Rao ,
Lyubov M. Belova ,
G. Catalan ,
J. Hong ,
James Scott ,
A. K. Tyagi ,
O. D. Jayakumar ,
R. Shukla  and
Yi Sheng
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Sandeep Nagar
Affiliation:
[email protected], KTH, Dept. of Materials Science, Royal Institute of Technology, Stockholm, Stockholm lan, Sweden, Stockholm, Stockholm, Sweden
K. V. Rao
Affiliation:
[email protected], KTH, Dept. of Materials Science, Royal Institute of Technology, Stockholm, Stockholm lan, Sweden, Stockholm, Sweden
Lyubov M. Belova
Affiliation:
[email protected], KTH, Dept. of Materials Science, Royal Institute of Technology, Stockholm, Stockholm lan, Sweden, Stockholm, Stockholm, Sweden
G. Catalan
Affiliation:
[email protected], University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
J. Hong
Affiliation:
[email protected], University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
James Scott
Affiliation:
[email protected], United States
A. K. Tyagi
Affiliation:
[email protected], Bhabha Atomic Research Centre, Chemistry Division, Mumbai, Maharashtra, India
O. D. Jayakumar
Affiliation:
[email protected], Bhabha Atomic Research Centre, Chemistry Division, Mumbai, Maharashtra, India
R. Shukla
Affiliation:
[email protected], Bhabha Atomic Research Centre, Chemistry Division, Mumbai, Maharashtra, India
Yi Sheng
Affiliation:
[email protected], Lawrence Berkeley National Laboratory, Advanced Light Source, Berkeley, California, United States
Jinghua Guo
Affiliation:
[email protected], Lawrence Berkeley National Laboratory, Advanced Light Source, Berkeley, California, United States
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Abstract

Search for novel multi-functional materials, especially multiferroics, which are ferromagnetic above room temperature and at the same time exhibit a ferroelectric behavior much above room temperature, is an active topic of extensive studies today. Ability to address an entity with an external field, laser beam, and also electric potential is a welcome challenge to develop multifunctional devices enabled by nanoscience. While most of the studies to date have been on various forms of Bi- and Ba based Ferrites, rare earth chromites are a new class of materials which appear to show some promise. However in the powder and bulk form these materials are at best canted antiferromagnetics with the magnetic transition temperatures much below room temperature. In this presentation we show that thin films of YbCrO3 deposited by Pulsed Laser Deposition exhibit robust ferromagnetic properties above room temperature. It is indeed a welcome surprise and a challenge to understand the evolution of above room temperature ferromagnetism in such a thin film. The thin films are amorphous in contrast to the powder and bulk forms which are crystalline. The magnetic properties are those of a soft magnet with low coercivity. We present extensive investigations of the magnetic and ferroelectric properties, and spectroscopic studies using XAS techniques to understand the electronic states of the constituent atoms in this novel Chromite. While the amorphous films are ferromagnetic much above room temperature, we show that any observation of ferroelectric property in these films is an artifact of a leaky highly resistive material.

Keywords

ferroelectricferromagneticelectronic material
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1161: Symposium I – Engineered Multiferroics–Magnetoelectric Interactions, Sensors and Devices , 2009 , 1161-I07-04
Copyright
Copyright © Materials Research Society 2009

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