Issue
EPL
Volume 86, Number 1, April 2009
Article Number 17007
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/86/17007
Published online 22 April 2009
EPL, 86 (2009) 17007
DOI: 10.1209/0295-5075/86/17007

Electric-field control of a magnetic phase transition in Ni3V2O8

P. Kharel1, C. Sudakar1, A. Dixit1, A. B. Harris2, R. Naik1 and G. Lawes1

1   Department of Physics and Astronomy, Wayne State University - Detroit, MI 48201, USA
2   Department of Physics, University of Pennsylvania - Philadelphia, PA 19104, USA

glawes@wayne.edu

received 5 February 2009; accepted in final form 17 March 2009; published April 2009
published online 22 April 2009

Abstract
We report on the electric-field tuning of a magnetic phase transition temperature ($T_{\rm L}$) in multiferroic Ni3V2O8 thin films. The simultaneous magnetic and ferroelectric transition in Ni3V2O8 exhibits a clear dielectric anomaly; we monitored $T_{\rm L}$ under applied electric and magnetic fields using dielectric measurements. The transition temperature increases by 0.2 K $\pm$ 0.05 K when the sample is biased approximately 25 MV/m compared to zero bias. This electric-field control of the magnetic transition can be qualitatively understood using a mean-field model incorporating a tri-linear coupling between the magnetic order parameters and spontaneous polarization. The shape of the electric field-temperature phase boundary is consistent with the proper order parameter for the multiferroic phase in Ni3V2O8 being a linear combination of the magnetic and ferroelectric correlation functions.

PACS
75.70.Ak - Magnetic properties of monolayers and thin films.
77.80.Bh - Phase transitions and Curie point.
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.).

© EPLA 2009