Polar properties of Eu0.6Y0.4MnO3 ceramics and their magnetic field dependence

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Agostinho A Moreira (Author) FCUP; Almeida, A (Author) FCUP; Ferreira, WS (Author) Other; Chaves, MR (Author) Other; Kundys, B (Author) Other; Ranjith, R (Author) Other; Prellier, W (Author) Other; Vilela, SMF (Author) Other; Tavares, PB (Author) Other

Journal

Title: Journal of Physics Condensed Matter

Vol. 21

Final page: 446002

ISSN: 0953-8984

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 7 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-003-EDH

DOI: 10.1088/0953-8984/21/44/446002

Abstract (EN): Eu1-xYxMnO3, compared against other magnetoelectric systems, exhibits very distinctive features. Its magnetoelectric properties are driven by the magnetic spin of the Mn3+ ion, but they can be drastically changed by varying the content of Y3+, which does not carry any magnetic moment. Although the x = 0.40 composition has been studied extensively, some basic areas still remain to be thoroughly understood. Thus, this work is aimed at studying some of its polar properties and their magnetic field dependence as well. The experimental results reported here show that this material is very easily polarizable under external electric fields, and so, whenever the polarization is obtained from time integration of the displacement currents, an induced polarization is superposed on the spontaneous one, eventually masking the occurrence of ferroelectricity. We have found clear evidence for the influence of a magnetic field in the polar properties of Eu0.6Y0.4MnO3. The study of electric polarization of Eu0.6Y0.4MnO3 under an external magnetic field yields a value with the same order of magnitude of the remanent polarization as was determined from polarization reversal experiments. The comparison of the magnetically induced changes in the polarization obtained for polycrystalline samples and single crystals confirms the threshold magnetic field value for the polarization rotation from the a-direction to the c-direction, and provides evidence of the importance of the granular nature of the samples in the polar response to the magnetic field.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10