项目名称： 时间分辨的扫描磁光克尔显微镜结合VNA-FMR研究磁性异质薄膜阻尼变化

项目编号： No.11504413

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 于威

作者单位： 中国科学院物理研究所

项目金额： 23万元

中文摘要： 今天的磁记录设备中，在写入和读出数据时，总是伴随着磁有序体系平衡态的打破和改变，因此，为了进一步的对磁记录器件进行优化设计，我们需要更好的了解磁性体系的阻尼变化行为。由于今天的磁性记录设备基本全部是基于磁性异质结构的器件，因此，更好的了解磁多层薄膜结构中的阻尼的变化是至关重要的。.在本项目中，我们将使用时间分辨的扫描磁光克尔显微镜（TRSKM）以及VNA-FMR技术来研究磁性多层薄膜的自旋动力学和阻尼变化行为。TRSKM是在时域内研究磁性样品微区自旋动力学的有力工具，同时VNA-FMR能够在频域内直接获得样品的自旋动力学信息，二者结合可以有效全面的为磁性薄膜样品的自旋动力学进行表征。在项目实施过程中，我们将重点研究FM/NM/FM以及FM/NM结构，弄清制备工艺，各层厚度以及相对于基底的顺序对阻尼的影响机制。

中文关键词： 磁性薄膜；阻尼；磁光克尔效应；自旋波；自旋动力学

英文摘要： Understanding the damping behavior within magnetic system is a prerequisite to optimize the designing of magnetic data storage devices, since both the reading and writing processes are accompanied by changing of the equilibrium state of the magnetic ordered system within the device. As the current magnetic storage devices are mainly formed by hetrostructures with both magnetic and nonmagnetic layers, it is very important to understand how the nonmagnetic layer(s) affect(s) the damping of the entire hetrostructure. .In this proposed project, the magnetic damping behavior within such hetrostructure would be investigated by time resolved scanning Kerr microscopy(TRSKM) as well as VNA-FMR technique. TRSKM is a powerful tool for studying the local magnetic dynamics within time domain while VNA-FMR is a convenient method for studying the spin dynamics within the frequency domain. By combining both techniques, a full picture of the magnetic dynamics and damping behavior of the sample could be acquired. We will mainly focus on the FM/NM/FM and FM/NM heterostructures, and investigate how the fabrication process, thickness of different layers as well as their relative order to the substrate affect the damping of the structure.

英文关键词： magnetic thin film;damping;MOKE;spin waves;spin dynamics