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Magneto-optic crystal with rectangular hysteresis loop and high coercive field and preparation method

A technology of magneto-optical crystals and hysteresis loops, applied in the field of artificial body materials, can solve the problems of miniaturization, unfavorable design of integrated new structure devices, etc.

Inactive Publication Date: 2011-12-07
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the Faraday rotor made of magneto-optical crystals is about 1 mm thick, and a relatively large permanent magnet is required to make it in a saturated magnetization state. The external magnetic field is essential for the miniaturization and integration of optical communication devices such as optical isolators and beam splitters. and new structure device design are unfavorable

Method used

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  • Magneto-optic crystal with rectangular hysteresis loop and high coercive field and preparation method
  • Magneto-optic crystal with rectangular hysteresis loop and high coercive field and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: The growth formula is Y 2.28 Eu 0.36 Bi 0.36 Fe 4.85 Ga 0.15 o 12 magneto-optic crystal

[0023] In this example, Eu 3+ The doping concentration is 12at%, Bi 3+ The doping concentration is 12at%, Ga 3+ The doping concentration of ions is 3at%, that is, x=0.12, y=0.12, z=0.03. Molecular formula is Y 2.28 Eu 0.36 Bi 0.36 Fe 4.85 Ga 0.15 o 12 , Mix the weighed oxide raw materials evenly, pre-calcine at 1200°C for 12 hours, and form a cylindrical rod under isostatic pressure at a pressure of 250Mpa. The raw material rod is sintered at 1500°C for 24 hours to fully react to obtain a diameter of about 8mm. Polycrystalline material rod with a length of about 100mm. Put the polycrystalline raw material rod and seed crystal rod into the optical floating zone furnace. The infrared light generated by the halogen quartz lamp is reflected and focused on the bottom of the raw material rod to form a narrow melting zone. The seed crystals are connected, the raw...

Embodiment 2

[0024] Example 2: The growth formula is Y 2.28 Eu 0.36 Bi 0.36 Fe 4.85 Ga 0.15 o 12 magneto-optic crystal

[0025] In this example, Eu 3+ The doping concentration is 12at%, Bi 3+ The doping concentration is 12at%, Ga 3+ The doping concentration of ions is 3at%, that is, x=0.12, y=0.12, z=0.03. Molecular formula is Y 2.28 Eu 0.36 Bi 0.36 Fe 4.85 Ga 0.15 o 12 , add 6 times Bi 2 o 3 (weight) and a total amount of 3wt% of B 2 o 3 As a co-solvent, weigh in proportion and mix evenly. In a well-type molten salt furnace with a pulling and rotating device, heat up to 1300°C to melt the raw materials. After overheating for 8 hours, Y 3 Fe 5 o 12 The (YIG) seed crystal extends into the melt, rotates the seed crystal (10-30 rpm) and slowly cools down. When the temperature drops to 1240°C, pull the crystal out of the liquid surface and cool down at 50°C per hour. Finally got Y 2.28 Eu 0.36 Bi 0.36 Fe 4.85 Ga 0.15 o 12 Magneto-optic single crystal. The crystal ha...

Embodiment 3

[0026] Example 3: Growing Y 2.1 Eu 0.45 Bi 0.45 Fe 4.8 Ga 0.2 o 12 Magneto-optic single crystal thin film

[0027] In this example, Eu 3+ The doping concentration is 15at%, Bi 3+ The doping concentration is 15at%, Ga 3+ The doping concentration of ions is 4at%, that is, x=0.15, y=0.15, z=0.04. The molecular formula of magneto-optical thin film is Y 2.1 Eu 0.45 Bi 0.45 Fe 4.8 Ga 0.2 o 12 , add 6 times Bi 2 o 3 (weight) and a total amount of 3wt% of B 2 o 3 As a co-solvent, weigh and mix evenly in proportion, melt the raw materials in a liquid phase epitaxy furnace, overheat for 8 hours, immerse the GGG substrate in the solution, and the seed rod drives the substrate to rotate (speed 20-40 rpm) , after slowly cooling down to 1240°C, lift the GGG substrate to obtain Y 2.1 Eu 0.45 Bi 0.45 Fe 4.8 Ga 0.2 o 12 Magneto-optic single crystal thin films. The single crystal thin film has a nearly rectangular hysteresis loop, a coercive field of about 1000Oe, and a...

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Abstract

Magneto-optical crystal with rectangular hysteresis loop and high coercive magnetic field and its preparation method, the chemical expression of the crystal is (Y3(1-x-y)Eu3xBi3y)(Fe5(1-z)Ga5z)O12. The crystal has a high coercive field and a nearly rectangular hysteresis loop, and has a high remanence ratio after saturation magnetization. In the application of magneto-optical devices, such as optical isolators, it can realize self-locking without additional magnetic field. , which is very conducive to the miniaturization and integration of devices. High-quality single crystal can be grown by optical floating zone method or top seed crystal method, single crystal and amorphous thin film can be grown on the substrate by liquid phase epitaxy method and magnetron sputtering method respectively.

Description

technical field [0001] The invention belongs to the field of artificial body materials, in particular to a magneto-optic crystal with a rectangular hysteresis loop and a high coercive magnetic field. Background technique [0002] Yttrium iron garnet (YIG) magneto-optic crystals and thin films can be used in magneto-optic devices such as optical isolators, fiber optic current sensors, laser gyroscopes, microwave devices, circulators, and magneto-optical displays. Among them, the optical isolator is one of the indispensable key devices in the field of modern optical communication technology. As a one-way device, the optical isolator is a passive device for optical non-reciprocal propagation fiber. As the core component of the magneto-optic isolator, the quality of the magneto-optic crystal material used is directly related to the isolation of the device and the quality of information transmission. After the 1990s, the development of optical isolators is characterized by the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/28
Inventor 孙敦陆张庆礼罗建乔刘文鹏谷长江秦清海李为民韩松江海河殷绍唐
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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