Abstract
In this work, we present a systematic study of optical and magneto-optical properties of Y3-xBixFe5O12 thin films with various Bi concentrations (x = 1.5, 2, 2.5, 3) prepared by Metal Organic Decomposition on Gd3Ga5O12 (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.
Highlights
Magnetic garnets have attracted a considerable attention due to spintronic phenomena such as the spin Seebeck effect [1] and spin Hall magneto-resistance [2], or applications in integrated magneto-optical (MO) [3, 4] and non-reciprocal photonic devices [5, 6]
Obtained results allowed us to compare the properties of investigated Bi:YIGs thin films prepared by metal organic decomposition (MOD) to properties of bulk-like Bi:YIGs with small Bi concentrations prepared by epitaxial growth [7, 9]
Since substrates were transparent and both-side polished, we considered back reflections in the Spectroscopic Ellipsometry (SE) analysis
Summary
Magnetic garnets have attracted a considerable attention due to spintronic phenomena such as the spin Seebeck effect [1] and spin Hall magneto-resistance [2], or applications in integrated magneto-optical (MO) [3, 4] and non-reciprocal photonic devices [5, 6]. Yttrium iron garnets with high bismuth ion concentrations, Y3-xBixFe5O12 (Bi:YIGs) exhibit very strong spin-orbit coupling caused by the presence of Bi resulting into a high MO figure of merit [7,8,9,10,11,12,13,14] Several techniques such as liquid phase epitaxy, pulse laser deposition, sol-gel method or metalorganic chemical vapor deposition have been used to grow Bi:YIGs films of high optical and MO quality [15,16,17,18,19,20,21,22,23,24,25,26,27,28]. Using a combination of the SE results with MO measurements we determined the spectral dependence of off-diagonal permittivity tensor elements
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
