Volume 86, Number 1, April 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 April 2009|
Electric-field control of a magnetic phase transition in Ni3V2O8
Department of Physics and Astronomy, Wayne State University - Detroit, MI 48201, USA
2 Department of Physics, University of Pennsylvania - Philadelphia, PA 19104, USA
Corresponding author: firstname.lastname@example.org
Accepted: 17 March 2009
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.
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
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