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No.3(pp.119-150)

Home > Issues > Volume 11 (2006) > No.3(pp.119-150)

A Possible Origin of Ferromagnetism in Epitaxial BiFeO₃thin Films

Journal of Magnetics, Volume 11, Number 3, 30 Sep 2006, Pages 108-110

Jae-wan Chang(School of Materials Science and Engineering, Seoul National University), Jang Hyun M(Department of Materials Science and Engineering, Pohang University of Science and Technology(POSTECH)), Sang-Koog Kim*

(School of Materials Science and Engineering, Seoul National University)

Abstract

We prepared (111) oriented BiFeO₃ (BFO) thin films with the different thicknesses of 30, 70, and 200 nm using pulsed laser deposition. We examined relations between the ferromagnetism and strain of these films from xray diffraction and superconducting quantum interference device data. The saturation magnetization values of the films are independent of strain and rather dependent upon the thickness only. From the results, we suggest that the ferromagnetism in the BFO thin films originate from extrinsic factors such as the coexistence of Fe²⁺ and Fe³⁺.

Keywords: multiferroic; BiFeO3 thin film; ferromagnetism; oxygen vacancies

DOI:

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