Title: Magnetic and dielectric properties of layered perovskite Gd2Ti2O7 thin film epitaxially stabilized on a perovskite single crystal
Abstract: Layered perovskite (LP) titanates, Ln2Ti2O7 (Ln = lanthanoids), are ferroelectric materials containing magnetic Ln3+ ions at A-site. Metastable LP-Gd2Ti2O7 was fabricated in epitaxial thin film form on lattice-matched perovskite substrates and its dielectric and magnetic properties were investigated. The (100)-oriented LP-Gd2Ti2O7 films were epitaxially grown on (110) plane of (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 (LSAT) and Nb-doped SrTiO3 by using a pulsed laser deposition method. Piezoresponse force microscope measurements revealed that LP-Gd2Ti2O7 has spontaneous polarization along the b-axis at room temperature, strongly suggesting room temperature ferroelectricity. Magnetization measurements showed paramagnetic behavior with weak antiferromagnetic interaction around 2 K. Small positive magneto-dielectric effect (Δɛ/ɛ ∼ 10−5 order) was also confirmed at 10 K.
Publication Year: 2012
Publication Date: 2012-02-28
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 6
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