Investigation of the Interface of Y₃Fe₅O₁₂/Gd₃Ga₅O₁₂ Structure Obtained by the Liquid Phase Epitaxy

Abstract

The changes in the optical, structural, mechanical properties, and chemical composition of Y 3 Fe 5 O 12 /Gd 3 Ga 5 O 12 (YIG/GGG) single crystal structures grown by liquid phase epitaxy, particularly at the interface between the film (Y 3 Fe 5 O 12 ) and the substrate (Gd 3 Ga 5 O 12 ), are studied. Different complementary techniques, including optical microscopy, local spectrophotometry, electron probe microanalysis, micro-Raman spectroscopy, and nanohardness analysis are used. The main finding of the study is an experimental approach, in which the probe of the measuring device (light beam, electron beam, nanoindenter) is directed to the surface of the studied sample in a direction perpendicular to the direction of structure growth, and the surface is scanned along this direction. It allows to obtain the profiles of changes in refractive properties, nanohardness, optical absorption, chemical composition, and intensity of phonon spectrum bands at the transition from the GGG to YIG. It is established that the lengths of the scanning intervals, at which the changes of various properties of a specimen occur, differ significantly. The obtained results are affected by the size of the probes and by the sensitivities of both the particular measuring method and the particular physical property of the material to changes in the chemical composition and crystalline structure of the sample.

Patterning Magnonic Structures via Laser Induced Crystallization of Yittrium Iron Garnet

“…in conditions leading to a clear transition towards a light-purple color in the optical images, a YIG T2g feature (C) at about 187.5 cm -1 appears, which is a fingerprint of crystalline YIG. [32] The prominent T2g peaks (A,B) at 168.5 and 178.5 cm -1 are instead arising from the GGG substrate. The intensity of the YIG T2g peak (C), normalized to that of the adjacent GGG T2g peak (B), is shown in the inset of Figure 1d.…”

Tuning of Magnetic Damping in Y3Fe5O12/Metal Bilayers for Spin-Wave Conduit Termination

“…A material of choice for complex SW conduits is yttrium iron garnet (YIG) in the single-crystal phase [8]. The growth of ultra-low damping YIG films has been optimized in the last decade [9][10][11][12] and the development of garnet layers is ongoing [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Hitherto, state-of-art YIG films provide high relaxation times of hundreds of nanoseconds corresponding to millimeterscale SW decay length [27][28][29].…”