Preparation of Bi-Doped Re3Fe5O12 Magneto-Optical Films by Lead-Free Liquid-Phase Epitaxy Method

doi:10.16553/j.cnki.issn1000-985x.2025.0045

Abstract

Abstract: Bi-doped Re₃Fe₅O₁₂ （RIG） single crystal films with a thickness of 1 140 μm were successfully prepared by a lead-free liquid-phase epitaxy （LPE） method using bismuth oxide as solvent， iron oxide and rare-earth oxides as solute， and gadolinium-gallium-doped garnet （SGGG） wafers as epitaxial substrate. The structure and related properties of the films were studied. The result of single crystal X-ray diffraction analysis shows that the prepared film is of a single crystal garnet-phase structure with high crystallization quality. Scanning electron microscopy observation reveals that the surface of film is smooth and uniform， without any obvious cracks or defects， and it is tightly bonded to the substrate. Infrared spectroscopy tests demonstrate that the transmittance of film is close to 70% in the application bands from 1 310 nm to 1 550 nm. Magnetic measurement results indicate that the film exhibits a typical soft-magnetic material hysteresis loop characteristics and has a relatively small saturation magnetization. Magneto-optical tests in the home-made platform show that the Verdet constants of film are 16 841 and 11 993 rad/（T·m） at wavelengths of 1 310 and 1 550 nm， respectively. This study results indicate that the films prepared by LPE method possess excellent properties， expected to be used in Faraday optical isolator in optical communication.

Key words: garnet single crystal; Bi doping; lead-free liquid-phase epitaxy method; magneto-optical film; Faraday optical isolator

CLC Number:

O734

LI Xiang, PANG Jun, WANG Ming, LUO Yi, GONG Rui, ZHAO Jianhua, YU Jie. Preparation of Bi-Doped Re₃Fe₅O₁₂ Magneto-Optical Films by Lead-Free Liquid-Phase Epitaxy Method[J]. Journal of Synthetic Crystals, 2025, 54(9): 1600-1606.

Figures/Tables 8

Fig.1 Preparation process flowchart of Bi:RIG film

Fig.2 Bi:RIG single crystal film before （a） and after （b） pickling

Fig.3 XRD patterns of single crystal （a） and powder （b） of Bi:RIG

Fig.4 SEM images of the surface （a） and cross section （b） of Bi:RIG single crystal film

Fig.5 Transmission curve of Bi:RIG

Fig.6 Hysteresis loops of Bi:RIG

Fig.7 Schematic diagram of the principle of Faraday rotation angle

Table 1 Test parameters and results of magneto-optical properties

Wavelength/nm	1 310	1 550
Rotation angle/（°）	66	47
Faraday rotation angle/（（°）·μm^-1）	0.057	0.041
Thickness for 45°/μm	777.3	1 091.4
Verdet constant/（rad·T^-1·m^-1）	16 841	11 993

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Preparation of Bi-Doped Re₃Fe₅O₁₂ Magneto-Optical Films by Lead-Free Liquid-Phase Epitaxy Method

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