Magnetoelectric Coupling in epsilon-Fe2O3

Details Magnetoelectric Coupling in epsilon-Fe2O3 Magnetoelectric Coupling in epsilon-Fe2O3

2005-09-05

arxiv.org/abs/cond-mat/0509104v1

Nanotechnology 17 (2006) 687-691

Physics

Condensed Matter

Materials Science

17 pages, 4 figures, submitted to Nanotechnology

Scientific paper

10.1088/0957-4484/17/3/012

Nanoparticles of the ferrimagnetic epsilon-Fe2O3 oxide have been synthesized by sol-gel method. Here, we report on the measurements of the dielectric permittivity as a function of temperature, frequency and magnetic field. It is found that, coinciding with the transition from collinear ferrimagnetic ordering to an incommensurate magnetic state occurring at about 100 K, there is an abrupt change (about 30 %) of permittivity suggesting the existence of a magnetoelectric coupling in this material. Indeed, magnetic field dependent measurements at 100 K have revealed an increase of the permittivity by about 0.3 % in 6 T. Prospective advantages of epsilon-Fe2O3 as multiferroic material are discussed.

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