HAMR磁头磁盘界面薄膜动力学特性研究
发布时间：2018-08-05 13:03
【摘要】：由于人们对大容量磁盘的需求越来越迫切,而目前的磁记录技术逐渐不能满足日益增长的需求,新的磁盘技术亟待开发,热辅助磁记录技术(Heat Assisted Magnetic Recording,HAMR)是目前最有希望大幅提升磁存储密度的技术之一。但由于热源的引入,该技术会对磁头磁盘间的润滑提出了更苛刻的要求,因此保证HAMR磁盘中润滑的持续有效性对磁盘的稳定工作有重要意义。在上述背景下,本文利用更接近实际工作状态的物理模型研究了磁盘中气膜、润滑膜和热源三者间的相互作用关系,为磁盘新技术的发展提供了一定的理论基础。本文考虑了气体稀薄效应推导了修正的雷诺方程。基于流体的连续性理论和Navier-Stokes方程,建立了润滑膜的流动方程并推导了该方程在柱坐标系下的表达形式,为磁盘旋转模型的提出奠定理论基础。在磁盘旋转模型基础上,引入激光热源,得到润滑膜损耗方程。分别用磁盘的旋转模型和直线模型求解了两种类型磁头引起的空气动压力和润滑膜流动情况,证明了新建立的旋转模型的正确性和进步性。利用新的模型研究了磁头姿态、磁头在磁盘上的位置等参数对空气动压力和润滑膜变化的影响,并证明了合理的磁头表面形貌的重要性。文中还利用定量的方法表征了磁头受力分布的问题,为预测润滑膜流动提供了一定的理论依据。此外,本文还提出了一些关于选择磁盘工作参数的合理建议。研究了热源对润滑膜的蒸发作用。分析了近场激光和空气动压力对润滑膜的叠加作用与近场激光、空气动压力单独作用的区别,讨论了特定工作条件下引起HAMR磁盘中润滑膜变化的主要因素。探究了激光功率、激光光斑半径、润滑剂分子质量和润滑膜初始膜厚等磁盘参数对润滑膜膜厚变化产生的影响,并分析了产生这些现象的原因。提出了一些指导HAMR技术磁盘设计的建议。根据润滑膜变化后的表面形貌,建立了新的气膜厚度函数以求解润滑膜变化对磁头受力的影响。探究了磁头姿态和飞行高度对膜厚变化和空气动压力之间的相互作用关系的影响,给出了将膜厚变化和空气动压力视为强耦合的条件。此外,本文提出了一种近似表达变化后的润滑膜表面的方法并进行了论证。
[Abstract]:Since the demand for mass disk is becoming more and more urgent, and the current magnetic recording technology can not meet the increasing demand, new disk technology needs to be developed. Thermal assisted magnetic recording (Heat Assisted Magnetic recording) is one of the most promising techniques to increase magnetic storage density. However, due to the introduction of heat source, the technology will put forward more stringent requirements for lubrication between magnetic head disks, so it is important to ensure the continuous effectiveness of lubrication in HAMR disks for the stability of the disk. Under the above background, the interaction between the film, the lubricating film and the heat source in the disk is studied by using the physical model which is closer to the actual working state, which provides a theoretical basis for the development of the new disk technology. In this paper, the modified Reynolds equation is derived considering the gas rarefaction effect. Based on the continuity theory of fluid and Navier-Stokes equation, the flow equation of lubricating film is established and the expression of the equation in cylindrical coordinate system is derived, which lays a theoretical foundation for the presentation of disk rotation model. Based on the disk rotation model, the lubrication film loss equation is obtained by introducing the laser heat source. The dynamic air pressure and the lubricating film flow caused by two types of magnetic head are solved by using the disk rotation model and the linear model respectively. The correctness and progressiveness of the new rotating model are proved. The effects of magnetic head attitude and magnetic head position on the dynamic air pressure and lubricating film are studied by using the new model, and the importance of reasonable surface morphology of the magnetic head is proved. The distribution of magnetic head force is also characterized by quantitative method, which provides a theoretical basis for predicting the flow of lubricating film. In addition, this paper also puts forward some reasonable suggestions on the selection of disk working parameters. The effect of heat source on evaporation of lubricating film was studied. The difference between the superposition of near field laser and air dynamic pressure on lubricating film and the single action of near field laser and air dynamic pressure is analyzed. The main factors that cause the change of lubricating film in HAMR disk are discussed. The effects of laser power, laser spot radius, molecular mass of lubricant and initial film thickness of lubricating film on the change of film thickness are investigated, and the causes of these phenomena are analyzed. Some suggestions to guide the disk design of HAMR technology are put forward. According to the surface morphology of the lubricating film, a new film thickness function is established to solve the influence of the lubricating film change on the magnetic head force. The influence of magnetic head attitude and flying altitude on the interaction between film thickness variation and air dynamic pressure is investigated. The conditions for considering the film thickness variation and the air dynamic pressure as strong coupling conditions are given. In addition, a method to approximate the surface of the lubricating film is proposed and demonstrated.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP333.35
本文编号：2165878
[Abstract]:Since the demand for mass disk is becoming more and more urgent, and the current magnetic recording technology can not meet the increasing demand, new disk technology needs to be developed. Thermal assisted magnetic recording (Heat Assisted Magnetic recording) is one of the most promising techniques to increase magnetic storage density. However, due to the introduction of heat source, the technology will put forward more stringent requirements for lubrication between magnetic head disks, so it is important to ensure the continuous effectiveness of lubrication in HAMR disks for the stability of the disk. Under the above background, the interaction between the film, the lubricating film and the heat source in the disk is studied by using the physical model which is closer to the actual working state, which provides a theoretical basis for the development of the new disk technology. In this paper, the modified Reynolds equation is derived considering the gas rarefaction effect. Based on the continuity theory of fluid and Navier-Stokes equation, the flow equation of lubricating film is established and the expression of the equation in cylindrical coordinate system is derived, which lays a theoretical foundation for the presentation of disk rotation model. Based on the disk rotation model, the lubrication film loss equation is obtained by introducing the laser heat source. The dynamic air pressure and the lubricating film flow caused by two types of magnetic head are solved by using the disk rotation model and the linear model respectively. The correctness and progressiveness of the new rotating model are proved. The effects of magnetic head attitude and magnetic head position on the dynamic air pressure and lubricating film are studied by using the new model, and the importance of reasonable surface morphology of the magnetic head is proved. The distribution of magnetic head force is also characterized by quantitative method, which provides a theoretical basis for predicting the flow of lubricating film. In addition, this paper also puts forward some reasonable suggestions on the selection of disk working parameters. The effect of heat source on evaporation of lubricating film was studied. The difference between the superposition of near field laser and air dynamic pressure on lubricating film and the single action of near field laser and air dynamic pressure is analyzed. The main factors that cause the change of lubricating film in HAMR disk are discussed. The effects of laser power, laser spot radius, molecular mass of lubricant and initial film thickness of lubricating film on the change of film thickness are investigated, and the causes of these phenomena are analyzed. Some suggestions to guide the disk design of HAMR technology are put forward. According to the surface morphology of the lubricating film, a new film thickness function is established to solve the influence of the lubricating film change on the magnetic head force. The influence of magnetic head attitude and flying altitude on the interaction between film thickness variation and air dynamic pressure is investigated. The conditions for considering the film thickness variation and the air dynamic pressure as strong coupling conditions are given. In addition, a method to approximate the surface of the lubricating film is proposed and demonstrated.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP333.35
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