| 双层结构微波纳米振荡器件的振荡特性调控 |
| |
| 作者姓名： | 李斯阳 卢志红 袁晓娟 方旭 王高 樊帅锋 |
| |
| 作者单位： | 1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081;2. 武汉科技大学材料与冶金学院,湖北 武汉,430081,1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081;2. 武汉科技大学材料与冶金学院,湖北 武汉,430081,1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081;2. 武汉科技大学材料与冶金学院,湖北 武汉,430081,1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081;2. 武汉科技大学材料与冶金学院,湖北 武汉,430081,1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081;2. 武汉科技大学材料与冶金学院,湖北 武汉,430081,1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081;2. 武汉科技大学材料与冶金学院,湖北 武汉,430081 |
| |
| 基金项目： | 国家自然科学基金资助项目(51871170). |
| |
| 摘 要： | 针对由垂直磁化和面内磁化的CoPtCr合金组成的双层结构微波纳米振荡器件,本文利用微磁模拟软件OOMMF研究了其在电流驱动下的振荡特性,并提出了不同的纳米柱阵列结构以提高振荡器整体的功率输出。结果表明,纳米柱截面尺寸保持不变,当面内磁化区域的厚度超过20 nm时,其对双层纳米柱产生的振荡频率不再影响,振荡振幅则随厚度的增加而继续增大。本文提出了平行四边形结构排列的双层纳米柱阵列,各纳米柱之间锁相情况较好,在电流密度为3.89×10~(11) A/m~2的驱动下,纳米柱阵列整体产生的振荡振幅为单个纳米柱产生振幅的3.6倍左右。
|
| 关 键 词： | 纳米振荡器 自旋转移力矩 CoPtCr合金 纳米柱阵列 微磁模拟 锁相 振荡特性 |
| 收稿时间： | 2019/12/20 0:00:00 |
Manipulation of oscillation characteristics of bilayer microwave nano-oscillator |
| |
| Authors: | Li Siyang Lu Zhihong Yuan Xiaojuan Fang Xu Wang Gao and Fan Shuaifeng |
| |
| Institution: | 1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China,1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China,1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China,1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China,1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China and 1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China |
| |
| Abstract: | Based on the micromagnetic simulation software OOMMF, the oscillation characteristics of the microwave nano-oscillator composed of bilayer CoPtCr alloy nanopillar with in-plane and perpendicular magnetization under direct current drive were studied, and various nanopillar array arrangement schemes were proposed to enhance the overall power output of the microwave nano-oscillator. The results illustrate that with the constant cross-sectional dimension of nanopillar,when the thickness of in-plane magnetization area exceeds 20 nm, its influence on the oscillation frequency generated by the bilayer nanopillar is no longer significant; however, the amplitude still increases with the increase of thickness. Moreover, in order to improve the overall power output of the microwave nano-oscillator, a parallelogram structure array containing four bilayer nanopillars located at each vertex has been proposed. The four nanopillars exhibit good performance of phase lock, with the driven current density at 3.89×1011 A/m2, and the oscillation amplitude of the nanopillar array as a whole is about 3.6 times that of a single nanopillar. |
| |
| Keywords: | nano-oscillator spin transfer torque CoPtCr alloy nano pillar array micromagnetic simulation phase lock oscillation characteristics |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《》浏览原始摘要信息 |
| 点击此处可从《》下载免费的PDF全文 |
|
