| 纳米级自旋分离的铁磁共振成像研究 |
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| 引用本文： | 李圣昆,;马宗敏,;张欢,;薛慧,;唐军,;石云波,;薛晨阳,;刘俊,;李艳君. 纳米级自旋分离的铁磁共振成像研究[J]. 中国科学:物理学 力学 天文学, 2014, 0(8): 821-827 |
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| 作者姓名： | 李圣昆, 马宗敏, 张欢, 薛慧, 唐军, 石云波, 薛晨阳, 刘俊, 李艳君 |
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| 作者单位： | [1]中北大学电子测试技术重点实验室,太原030051; [2]中北大学仪器科学与动态测试教育部重点实验室,太原030051; [3]中北大学仪器与电子学院,太原030051; [4]日本大阪大学工学研究科 精密科学应用物理学专攻,大阪565—0871,日本 |
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| 基金项目： | 国家自然科学基金资助项目（批准号：61274103,91336110,51225504） |
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| 摘 要： | 自旋间的相互作用力对原子级别纳米构造体磁性质的理解是极为重要的.磁交换力显微镜(MExFM)是测量原子磁矩相互作用力的一种创新手段,但是这种手段不能分离表面形貌和自旋信息.我们提出的铁磁共振磁交换力显微镜(FMR-MExFM)实现了磁性材料表面的磁交换力信息和表面形貌信息的分离.为了充分利用铁磁共振效应,高效率的微波照射机构是极为重要的一项.在本研究中,通过照射机构的仿真和优化设计得到了微波在同轴电缆间的衰减、照射机构直径以及同轴电缆-探针距离之间的关系,同时得到了最优化的实验条件,在此基础上提高了铁磁共振检测的灵敏度.运用改进后的FMR-MExFM,成功地完全分离了磁性信息和表面结构信息,实现了磁性信息N极和S极的180°的相位差.本研究对FMR-MExFM的开发、磁信息检测具有重要的作用.
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| 关 键 词： | 自旋 磁交换力显微镜 铁磁共振(FMR) 微波照射 |
Spin observation with ferromagnetic resonance imaging at nano-scale |
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| Affiliation: | LI ShengKun, MA ZongMin, ZHANG Huan, XUE Hui, TANG Jun, SHI YunBo, XUE ChenYang, LIU Jun, LI YanJun ( 1. National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China; 2. Key Laboratory of Instrumentation Science ＆ Dynamic Measurement, North University of China, Ministry of Education, Taiyuan 030051, China; 3. School oflnstrument and Electronics, North University of China, Taiyuan 030051, China; 4 Department of Applied Physics, Osaka University, Osaka 565-0871, Japan) |
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| Abstract: | Spins play an important role in investigating magnetic properties of nano-structure at atomic scale, and Magnetic Exchange Force Microscope （MExFM） as a useful method has been introduced to measure exchange force between spins. However, the external magnetic field is necessary for the MExFM, which will damage the structure of the sample surface; further, cross-talk between topography and spin information becomes serious for separating the two signals in MExFM measurement. These shortcomings limit the application of MExFM. In order to solve these, we developed a new method called FMR-MExFM using ferromagnetic resonance by microwave radiation combined MExFM and atomic force microscopy （AFM） to separate the topography and spin of sample surface. Here, in order to obtain the high sensitivity in detecting the ferromagnetic resonance, we focus on designing the microwave irradiation device to optimizing the position between the device and the cantilever. We experimentally observed the ferromagnetic resonance between the microwave irradiation device and the cantilever at room temperature. Further, we succeed in separating the magnetic and topographic signal completely, and difference of magnetic phase is 180~. This research is very important for developing the FMR-MExFM, novel magnetic sensor, and the detecting of the magnetic information, etc. |
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| Keywords: | spin MExFM FMR microwave irradiation |
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