磁记录介质晶粒磁相互作用参数ΔM及其测量方法  

Parameter ΔM for Characterizing the Intergranular Magnetic Interaction in Magnetic Recording Media and Its Measurement

作　　者：李震[1] 鄢俊兵[1] 程伟明[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《磁性材料及器件》2008年第4期18-21,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(60490290);国家自然科学基金资助项目(60571010)

摘　　要：对于磁记录介质,记录噪声与晶粒间磁相互作用相关。ΔM是表征磁记录介质晶粒间磁相互作用的重要参数。首先介绍了它的理论依据和意义,接着阐述了通过振动样品磁强计测量样品的等温剩磁(IRM)和直流退磁剩磁(DCD)曲线,经过对测量数据的处理和计算获得ΔM曲线的方法和步骤,讨论了影响ΔM测量的相关问题。最后应用该方法测量了两种TbFeCo薄膜样品的ΔM曲线,定性比较分析了薄膜晶粒间磁相互作用的大小和类型。It is well known that recording media noise is strongly dependent on intergranular exchange coupling. △M is an important parameter for the characterization of intergranular magnetic interaction in magnetic recording thin films. First, this paper introduced the theoretic background and significance of △M. Secondly a measuring method for △M, in which △M curves were obtained through IRM and DCD curves measured by using VSM and simple computation, and furtherly, the issues on some factors affecting △M measurement were discussed. Thirdly, we measured the AM curves of two types of amorphous TbFeCo thin films and analyze qualitatively the intensity and the type of intergranular magnetic interaction.

关 键 词：磁记录介质 晶粒交换耦合作用 磁偶极作用 介质噪声 剩磁曲线 

分 类 号：TQ58[化学工程—精细化工]