Kumar, Ashok and Scott, J. F. and Martinez, R. and Srinivasan, G. (2012) In-plane dielectric and magnetoelectric studies of BiFeO3. physica status solidi (a), 209 (7). pp. 1207-1212. ISSN 1862-6300

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In-plane temperature dependent dielectric behavior of BiFeO3 (BFO) as-grown thin films show diffuse but prominent phase transitions near 450 (+/- 10)?K and 550?K with dielectric loss temperature dependences that suggest skin layer effects. The 450?K anomalies are near the transition first reported by Polomska et al. [Phys. Status Solidi 23, 567 (1974)]. The 550?K anomalies coincide with the surface phase transition recently reported [Marti et al., Phys. Rev. Lett. 106, 236101 (2011)]. In addition, anomalies are found at low temperatures: After several experimental cycles, the dielectric loss shows a clear relaxor-like phase transition near what was previously suggested to be a spin reorientation transition (SRT) temperature (similar to 201?K) for frequencies 1?kHz?<?f?<?1?MHz which follow a nonlinear VogelFulcher (VF) relation; an additional sharp anomaly is observed near similar to 180?K at frequencies below 1?kHz. As emphasized recently by Cowley et al. [Adv. Phys. 60, 229 (2011)], skin effects are expected for all relaxor ferroelectrics. Using the interdigital electrodes, experimental data and a theoretical model for in-plane longitudinal and transverse direct magnetoelectric (ME) coefficient are presented.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Wiley-VCH Verlag.
Subjects: Materials Science
Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 12 Mar 2020 11:43
Last Modified: 12 Mar 2020 11:43
URI: http://npl.csircentral.net/id/eprint/3529

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