【摘要】：由于人們對大容量磁盤的需求越來越迫切,而目前的磁記錄技術(shù)逐漸不能滿足日益增長的需求,新的磁盤技術(shù)亟待開發(fā),熱輔助磁記錄技術(shù)(Heat Assisted Magnetic Recording,HAMR)是目前最有希望大幅提升磁存儲密度的技術(shù)之一。但由于熱源的引入,該技術(shù)會對磁頭磁盤間的潤滑提出了更苛刻的要求,因此保證HAMR磁盤中潤滑的持續(xù)有效性對磁盤的穩(wěn)定工作有重要意義。在上述背景下,本文利用更接近實際工作狀態(tài)的物理模型研究了磁盤中氣膜、潤滑膜和熱源三者間的相互作用關(guān)系,為磁盤新技術(shù)的發(fā)展提供了一定的理論基礎(chǔ)。本文考慮了氣體稀薄效應(yīng)推導(dǎo)了修正的雷諾方程�；诹黧w的連續(xù)性理論和Navier-Stokes方程,建立了潤滑膜的流動方程并推導(dǎo)了該方程在柱坐標(biāo)系下的表達形式,為磁盤旋轉(zhuǎn)模型的提出奠定理論基礎(chǔ)。在磁盤旋轉(zhuǎn)模型基礎(chǔ)上,引入激光熱源,得到潤滑膜損耗方程。分別用磁盤的旋轉(zhuǎn)模型和直線模型求解了兩種類型磁頭引起的空氣動壓力和潤滑膜流動情況,證明了新建立的旋轉(zhuǎn)模型的正確性和進步性。利用新的模型研究了磁頭姿態(tài)、磁頭在磁盤上的位置等參數(shù)對空氣動壓力和潤滑膜變化的影響,并證明了合理的磁頭表面形貌的重要性。文中還利用定量的方法表征了磁頭受力分布的問題,為預(yù)測潤滑膜流動提供了一定的理論依據(jù)。此外,本文還提出了一些關(guān)于選擇磁盤工作參數(shù)的合理建議。研究了熱源對潤滑膜的蒸發(fā)作用。分析了近場激光和空氣動壓力對潤滑膜的疊加作用與近場激光、空氣動壓力單獨作用的區(qū)別,討論了特定工作條件下引起HAMR磁盤中潤滑膜變化的主要因素。探究了激光功率、激光光斑半徑、潤滑劑分子質(zhì)量和潤滑膜初始膜厚等磁盤參數(shù)對潤滑膜膜厚變化產(chǎn)生的影響,并分析了產(chǎn)生這些現(xiàn)象的原因。提出了一些指導(dǎo)HAMR技術(shù)磁盤設(shè)計的建議。根據(jù)潤滑膜變化后的表面形貌,建立了新的氣膜厚度函數(shù)以求解潤滑膜變化對磁頭受力的影響。探究了磁頭姿態(tài)和飛行高度對膜厚變化和空氣動壓力之間的相互作用關(guān)系的影響,給出了將膜厚變化和空氣動壓力視為強耦合的條件。此外,本文提出了一種近似表達變化后的潤滑膜表面的方法并進行了論證。
[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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP333.35

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