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We report on the electric-field tuning of a magnetic phase transition temperature (TL) in multiferroic Ni3V2O8 thin films. The simultaneous magnetic and ferroelectric transition in Ni3V2O8 exhibits a clear dielectric anomaly; we monitored TL under applied electric and magnetic fields using dielectric measurements. The transition temperature increases by 0.2 K±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.
This is an author-created, un-copyedited version of an article accepted for publication in Europhysics Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at dx.doi.org/10.1209/0295-5075/86/17007.
Kharel, P. R., Sudakar, C., Dixit, A. V., Harris, A., Naik, R., & Lawes, G. J. (2009). Electric-Field Control of a Magnetic Phase Transition in Ni3V2O8. Europhysics Letters, 86 17007-p1-17007-p5. http://dx.doi.org/10.1209/0295-5075/86/17007
Date Posted: 20 August 2015
This document has been peer reviewed.