Optical and magneto-optical properties of Bi substituted yttrium iron garnets prepared by metal organic decomposition

• Published in: Optical materials express Vol. 6; no. 6; pp. 1986 - 1997
• Main Authors: Jesenska, Eva, Yoshida, Tomohiko, Shinozaki, Kenji, Ishibashi, Takayuki, Beran, Lukas, Zahradnik, Martin, Antos, Roman, Kučera, Miroslav, Veis, Martin
• Format: Journal Article
• Language: English
• Published: 01.06.2016
• Subjects: Decomposition; Ellipsometry; Liquid phase epitaxy; Magnetic properties; Optical properties; Spectra; Spectroscopy; Tensors
• ISSN: 2159-3930; 2159-3930
• DOI: 10.1364/OME.6.001986

In this work, we present a systematic study of optical and magneto-optical properties of Y sub(3-x) Bi sub(x) Fe sub(5) O sub(12) thin films with various Bi concentrations (x = 1.5, 2, 2.5, 3) prepared by Metal Organic Decomposition on Gd sub(3) Ga sub(5) O sub(12)(100) substrates. We used magneto-optical spectroscopy and spectroscopic ellipsometry. Spectral dependence of complex refraction indexes obtained from ellipsometric measurements revealed increasing optical absorption with increasing Bi concentrations. Faraday and Kerr magneto-optical spectra measured in the photon energy range from 1.5 to 5.5 eV clearly demonstrated that the increasing Bi concentration enhances the spin-orbit coupling and influences the magneto-optical effect. Using the magneto-optical and ellipsometric experimental data we deduced a spectral dependence of complete permittivity tensor in a wide spectral range. Comparison of obtained results with the results reported on Liquid Phase Epitaxy bulk-like garnets with small Bi concentrations showed agreement and confirmed a high optical and magneto-optical quality of investigated films.