Electric-field control of a magnetic phase transition in Ni3V2O8P. 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
received 5 February 2009; accepted in final form 17 March 2009; published April 2009
published online 22 April 2009
We report on the electric-field tuning of a magnetic phase transition temperature () in multiferroic Ni3V2O8 thin films. The simultaneous magnetic and ferroelectric transition in Ni3V2O8 exhibits a clear dielectric anomaly; we monitored 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.
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