MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Improvement of Magnetic and Dielectric Properties of BaFeO3−δ Thin Films by Sn Substitution
Ryoichi ShinodaAkihiro IwaseToshiyuki Matsui
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2015 Volume 56 Issue 3 Pages 288-291

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Abstract

Magnetic and dielectric properties of Ba(Fe1−xSnx)O3−δ (x = 0.5–0.9) epitaxial thin films on (001) SrTiO3 single crystalline substrates have been significantly improved. All of the Ba(Fe1−xSnx)O3−δ (BFSO) thin films were ferromagnetic in nature, even at room temperature, regardless of the amount of Sn-substitution. For the x = 0.7 samples, the saturation magnetization had a maximum value of 0.224 μB/f.u. at 300 K. The ferromagnetic origin of BFSO was considered to be from 180° super-exchange coupling of Fe4+(d4)-O2−-Fe4+(d4). Electrical conduction of the x = 0.9 samples could be determined to be Poole-Frenkel type. In contrast, it was found that several electrical conduction mechanisms coexist for the x = 0.7 and x = 0.8 samples. The leakage current density of the x = 0.7 samples was about 1.04 × 10−4 A/cm2 at the positive bias electric field at 400 kV/cm. The dielectric constant and dielectric loss were 120 and 0.06 even at 1 MHz, respectively.

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© 2015 The Japan Institute of Metals and Materials
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