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Non-reciprocal spin-wave waveguide material and its preparation method and application
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A spin-wave and non-reciprocal technology, applied in the field of non-reciprocal spin-wave waveguide materials and its preparation, can solve problems such as difficult to change, non-reciprocity of spin-wave transmission is not obvious, and achieve wide application prospects Effect
Active Publication Date: 2021-03-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, it is difficult to change the "environment" of spin wave transmission on the upper and lower surfaces of a single-layer YIG film. The non-reciprocity of the spin wave transmission is not obvious, only the difference in amplitude, and the peak position of the spin wave mode does not change.
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Embodiment 1
[0030] A non-reciprocal spin-wave waveguide material, including a GGG (gadolinium gallium garnet) single crystal substrate, and a yttrium iron garnet (YIG) single crystal thin film and a Dy (dysprosium) rare earth thin film sequentially formed on the substrate (YIG / Dy heterojunction).
[0031] The preparation method of above-mentioned material specifically comprises the following steps:
[0032] Step 1, with high purity (higher than 99.99wt%) Fe 2 o 3 and Y 2 o 3 As a raw material, yttrium iron garnet (YIG) single crystal thin film is grown on GGG (gadolinium gallium garnet) single crystal substrate by liquid phase epitaxy method to obtain yttrium iron garnet (YIG) single crystal substrate;
[0033] 1.1 will high-purity Fe 2 o 3 , Y 2 o 3 and Bi 2 o 3 Melting at 1000°C, Bi 2 o 3 As a flux, fully stirred to obtain a liquid phase growth melt;
[0034] 1.2 Select the GGG (gadolinium gallium garnet) single crystal substrate as the substrate, and clean the substrate: soa...
Embodiment 2
[0039] A non-reciprocal spin-wave waveguide material, including a GGG (gadolinium gallium garnet) single crystal substrate, and a yttrium iron garnet (YIG) single crystal thin film and a Tm (thulium) rare earth thin film sequentially formed on the substrate (YIG / Tm heterojunction).
[0040] The preparation method of above-mentioned material specifically comprises the following steps:
[0041] Step 1. Using a laser pulse deposition method to grow a yttrium iron garnet (YIG) single crystal thin film on a GGG (gadolinium gallium garnet) single crystal substrate to obtain a yttrium iron garnet (YIG) single crystal substrate; specifically: Y obtained by solid state reaction method 3 Fe 5 o 12 As a target, under the conditions of pulse frequency of 10Hz, oxygen partial pressure of 0.1Pa, and substrate temperature of 550°C, high-quality YIG film was grown by laser pulse deposition method;
[0042] Step 2, using the magnetron sputtering method to grow a Tm (thulium) film on the yt...
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Abstract
A non-reciprocal spin wave waveguide material and its preparation method and application belong to the technical field of new materials. The non-reciprocal spin wave waveguide material includes a GGG single crystal substrate, and a yttrium iron garnet single crystal thin film and a rare earth thin film sequentially formed on the substrate, wherein the rare earth thin film is Dy, Tm, Lu, Nd et al. Compared with a single YIG film, the YIG / rare earth heterojunction film of the present invention has significant non-reciprocity in the spin waves transmitted on the upper and lower surfaces, that is, the amplitude and peak position of the spin waves propagated on the upper and lower surfaces have changed significantly. On the other hand, compared with the single-layer YIG film, the thickness of the spin-wave waveguide material of the present invention has not changed significantly, and only a layer of nano-thick rare earth film is covered on the YIG surface, which is a non-reciprocal spin-wave waveguide material The research and preparation provide a new solution, which has broad application prospects in spintronics, spin wave waveguides, spin wave logic devices, quantum computing and many other fields.
Description
technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a non-reciprocal spin wave waveguide material and its preparation method and application. Background technique [0002] With the rapid development of information technology, the miniaturization and low power consumption of traditional electronic devices are facing severe bottlenecks due to the existence of current Joule heat. Spin Waves (Spin Waves) is the collective propagation process of electron spin precession in magnetically ordered materials, with no heat dissipation, non-ohmic contact, extremely high operating frequency range, room temperature Bose-Einstein condensation, Macroscopic quantum effects such as magnon superfluidity, etc. Information transmission and logic calculation based on spin waves may become one of the important ways of information transmission and processing in the post-Moore era. The waveguide material of the spin wave requires low l...
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