Layered perovskite (LP) titanates, Ln 2Ti 2O 7 (Ln lanthanoids), are ferroelectric materials containing magnetic Ln 3 ions at A-site. Metastable LP-Gd 2Ti 2O 7 was fabricated in epitaxial thin film form on lattice-matched perovskite substrates and its dielectric and magnetic properties were investigated. The (100)-oriented LP-Gd 2Ti 2O 7 films were epitaxially grown on (110) plane of (LaAlO 3) 0.3-(SrAl 0.5Ta 0.5O 3) 0.7 (LSAT) and Nb-doped SrTiO 3 by using a pulsed laser deposition method. Piezoresponse force microscope measurements revealed that LP-Gd 2Ti 2O 7 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 (/ ∼ 10 -5 order) was also confirmed at 10 K.
ASJC Scopus subject areas
- Physics and Astronomy(all)