可重构自旋波晶体管电场调控机理与实现研究

基于自旋波的新一代信息器件，因其功耗低、工作频率高、兼具波动性和粒子性，成为后摩尔时代重要技术方案。传统自旋波器件功能上不可重构，采用电流方式调控自旋波，电流密度大，热效应显著，限制了其低功耗化和集成发展。近年来，电场调控磁性成为低功耗操纵电子自旋的必然选择，磁绝缘体YIG单晶作为自旋波的理想传输介质，其电场调控机理尚不明确，可重构器件亟待突破。本项目基于此，首先，研究离子取代和对称性优化，液相外延生长兼具铁电性和低磁阻尼的新型YIG单晶薄膜；其次，探索电荷转移、磁电耦合、微观电磁场控制自旋波传输新机理，构建“重金属/YIG/重金属”异质结，获得电场调控自旋波传输幅度、相位和频率的有效方法；最后，通过微磁学仿真、微纳加工，实现具有可重构功能的自旋波晶体管，研究电场强度、方向性对传导自旋波幅度、相位和频率的调控规律，实现自旋波传输的关断、开启和放大功能，推动低功耗自旋波逻辑器的变革发展。

Information devices based on spin-waves has become an important technical route in the post-Moore era due to its low power consumption, high operating frequency, and both wave and particle properties. However, traditional spin-wave devices are not functionally reconfigurable. We used current or external magnetic fields to control spin waves. The current density was large and the thermal effect was significant, which limited its low power-consumption and integration development. In recent years, electric-field control of magnetism has become an inevitable choice for low power consumption to manipulate electron spin. Magnetic insulator YIG single crystal is an ideal transmission medium for spin-waves. Its electric-field control mechanism is still unclear, and reconfigurable spin-waves devices are in urgent need of breakthrough. Therefore, firstly, this project will study the ion substitution and crystal symmetry design. Grow new type of YIG single crystal film with both ferroelectricity and low magnetic damping using liquid phase epitaxy. Secondly, we will explore the mechanisms of charge transfer, magnetoelectric coupling, and electromagnetic fields modulated spin-wave transmission. With fabricating "heavy metal/YIG/heavy metal" heterojunctions, we will develop effective methods for the electric-field controlled amplitude, phase and frequency of the propagating spin-waves. Finally, we will carry out micromagnetic simulations and micro/nano fabrications to fabricate the reconfigurable spin-wave transistors. The regulation principle of electric-field strength and directionality on the amplitude, phase and frequency of the propagating spin-waves will be studied. The functions of turning off, turning on and amplifying spin-wave transmission will be measured. The project will promote the revolution of low power-consumption spin-wave logic devices.