磁盤力磁特性和熱力耦合作用下接觸退磁行為研究
發(fā)布時(shí)間：2018-10-09 17:34
【摘要】：隨著大數(shù)據(jù)時(shí)代的到來,硬盤存儲(chǔ)技術(shù)作為信息的重要“載體”,其磁存儲(chǔ)密度和磁記錄速度得到了迅猛發(fā)展,于是磁頭與磁盤的間距會(huì)不斷降低。甚至為了實(shí)現(xiàn)1 Tb/in2以上的超高密度磁存儲(chǔ)目標(biāo),其更是要降至2 nm以下,來保證磁頭讀寫時(shí)高信號分辨率的需求。但是在如此狹小的空間內(nèi),一旦發(fā)生磁盤跳動(dòng)、磁頭隨機(jī)振動(dòng)、空氣污染、潤滑劑轉(zhuǎn)移等情況,就很可能引起磁頭/磁盤接觸、造成磁盤內(nèi)部塑性變形和快速溫升的產(chǎn)生,從而導(dǎo)致接觸界面失效、出現(xiàn)不可估量的數(shù)據(jù)丟失等問題。這樣,磁頭與磁盤的接觸行為已經(jīng)逐漸成為當(dāng)前及未來磁存儲(chǔ)設(shè)備數(shù)據(jù)丟失的重要原因之一。然而目前,與磁頭/磁盤接觸相關(guān)的磁學(xué)變化規(guī)律和磁盤退磁原因尚不明確,難以為避免磁頭/磁盤接觸退磁發(fā)生提供技術(shù)支撐。因此,本文采用微磁仿真方法、有限元方法以及實(shí)驗(yàn)手段,研究了磁頭/磁盤接觸的磁學(xué)行為,涵蓋了以下幾方面研究內(nèi)容:根據(jù)塑性變形對磁疇的影響,本文從位錯(cuò)釘扎和殘余應(yīng)力兩方面出發(fā),利用疇壁釘扎模型與逆磁致伸縮原理分別推導(dǎo)了磁塑性能、磁應(yīng)力能計(jì)算式。并在磁塑性能中,加入了矢量性特征、拉壓性特征以及膜厚變化特征。于是,根據(jù)這兩個(gè)能量計(jì)算式,就建立了基于微磁學(xué)理論的磁塑性模型。另外,還提出了基于微磁學(xué)理論的磁塑性模型的兩種求解方法,由此完善了磁塑性模型的構(gòu)建。本文利用納米劃痕實(shí)驗(yàn)?zāi)M了磁頭/磁盤接觸的力磁行為,并通過磁力顯微鏡的相位成像原理,提出了一種定量探測方法,由此確定了磁盤的臨界退磁條件和磁頭/磁盤接觸作用力、磁盤表面破壞程度及磁頭/磁盤反復(fù)劃刮次數(shù)對磁盤磁性變化的影響規(guī)律。隨后,基于磁頭/磁盤滑動(dòng)接觸有限元模型和磁塑性模型,揭示了實(shí)驗(yàn)研究無法獲得的由磁頭/磁盤接觸的力磁行為導(dǎo)致的磁盤磁化演變過程。而且,采用磁盤介質(zhì)力磁特性的實(shí)驗(yàn)與仿真結(jié)果的對比分析,有效地驗(yàn)證了構(gòu)建的磁塑性模型的正確性。通過把隨機(jī)熱擾動(dòng)項(xiàng)、Voronoi模型特征以及磁塑性模型相結(jié)合,本文建立了涉及熱力耦合作用的Voronoi化微磁仿真模型,得到了溫度影響下塑性應(yīng)變/彈性應(yīng)力的大小、方向性及拉壓性與垂直磁記錄介質(zhì)磁化強(qiáng)度之間的依賴關(guān)系。繼而,建立了磁頭/磁盤高速滑動(dòng)接觸有限元模型,進(jìn)一步揭示了磁頭/磁盤接觸退磁過程中磁矩偏轉(zhuǎn)變化對磁性信息衰減的影響規(guī)律,并且獲得了磁頭/磁盤接觸作用力、劃刮速度對與轉(zhuǎn)變噪聲相關(guān)的介質(zhì)SNR的作用關(guān)系。最終,利用不銹鋼小球與磁盤的碰撞實(shí)驗(yàn),確定了磁頭/磁盤高速滑動(dòng)接觸有限元模型和Voronoi化微磁仿真模型的正確性。在磁頭/磁盤接觸作用下,本文通過改變磁盤介質(zhì)的材料熱力學(xué)屬性、磁盤介質(zhì)結(jié)構(gòu)與材料磁學(xué)屬性以及磁頭/磁盤接觸的界面參數(shù),獲得了磁盤介質(zhì)抗接觸退磁性能的影響規(guī)律,從而實(shí)現(xiàn)了提高磁記錄層抗高溫、抗高應(yīng)力應(yīng)變能力或者保持磁記錄層良好記錄狀態(tài)的目的。特別指出,本文在考慮預(yù)防磁盤介質(zhì)接觸退磁問題的同時(shí),還兼顧了“三難困境”的解決。
[Abstract]:With the advent of big data era, hard disk storage technology is important as information "Carrier" and the magnetic storage density and the magnetic recording speed are fast developed, so that the distance between the magnetic head and the magnetic disk is continuously reduced. Even in order to achieve the ultra-high density magnetic storage target of 1 Tb/ in2 or more, it is necessary to reduce the high signal resolution when reading and writing the magnetic head even below 2 nm. However, in such a narrow space, once disk runout occurs, magnetic head random vibration, air pollution, lubricant transfer, etc., it is likely to cause contact of the head/ disk, causing plastic deformation of the disk and rapid temperature rise resulting in failure of the contact interface, There are problems such as data loss and so on. In this way, the contact behavior of magnetic head and magnetic disk has become one of the most important reasons for data loss of current and future magnetic storage devices. However, it is difficult to provide technical support for magnetic head/ disk contact demagnetization. In this paper, the magnetic behavior of magnetic head/ disk contact is studied by using micro-magnetic simulation method, finite element method and experimental method, which covers the following aspects: based on the influence of plastic deformation on the magnetic domain, this paper starts from the two aspects of dislocation pinning and residual stress. Magnetic plastic energy and magnetic stress energy can be calculated by using domain wall pinning model and inverse magnetic resonance principle. In addition, the characteristics of vector characteristics, tensile properties and film thickness are added into the magnetoplastic energy. Thus, based on these two energy formulas, a magnetic plastic model based on micro-magnetic theory is established. In addition, two methods of solving the magnetic plastic model based on the micro-magnetic theory are also put forward, and the construction of the magnetic plastic model is perfected. In this paper, the magnetic behavior of magnetic head/ disk contact is simulated by nano scratch test, and a quantitative detection method is proposed by using the principle of phase imaging of magnetic microscope, thus defining the critical demagnetization condition of magnetic disk and the contact force of magnetic head/ disk. The damage degree of the disk surface and the influence of the number of repeated strokes of the head/ disk on the magnetic change of the magnetic disk. Subsequently, based on the magnetic head/ magnetic disk sliding contact finite element model and the magnetic plastic model, the process of magnetic disk magnetization due to the magnetic behavior of the magnetic head/ disk can not be obtained. Moreover, the correctness of the constructed magnetic plasticity model is verified by the comparison and analysis of magnetic characteristics of magnetic disk media and simulation results. By combining the random thermal perturbation term, Voronoi model characteristic and the magnetic plastic model, a Voronoi micro-magnetic simulation model involving thermal coupling is established, and the plastic strain/ elastic stress under the influence of temperature is obtained. the dependence of the directivity and the tensile force and the magnetization of the perpendicular magnetic recording medium. in turn, a finite element model of high speed sliding contact of a magnetic head/ disk is established, and the influence of magnetic moment deflection change on the attenuation of the magnetic information during the magnetic head/ disk contact demagnetization process is further disclosed, and the contact force of the magnetic head/ disk is obtained, The effect of scratch speed on the SNR of the medium associated with the transition noise. Finally, using the collision experiment of stainless steel ball and magnetic disk, the correctness of the finite element model of high speed sliding contact of magnetic head/ disk and Voronoi micro-magnetic simulation model is determined. Under the action of magnetic head/ disk contact, this paper obtains the influence law of anti-contact demagnetization performance of magnetic disk media by changing the material thermodynamics properties of magnetic disk media, the magnetic properties of magnetic disk media and the magnetic properties of materials and the interface parameters of magnetic head/ disk contact. thereby realizing the purpose of improving the high temperature resistance, the high stress response ability of the magnetic recording layer or keeping the good recording state of the magnetic recording layer. It is pointed out that this paper also gives consideration to the problem of preventing the contact demagnetization of magnetic disk media. "Three Difficult Position" a solution to the problem.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TP333.3
本文編號：2260175
[Abstract]:With the advent of big data era, hard disk storage technology is important as information "Carrier" and the magnetic storage density and the magnetic recording speed are fast developed, so that the distance between the magnetic head and the magnetic disk is continuously reduced. Even in order to achieve the ultra-high density magnetic storage target of 1 Tb/ in2 or more, it is necessary to reduce the high signal resolution when reading and writing the magnetic head even below 2 nm. However, in such a narrow space, once disk runout occurs, magnetic head random vibration, air pollution, lubricant transfer, etc., it is likely to cause contact of the head/ disk, causing plastic deformation of the disk and rapid temperature rise resulting in failure of the contact interface, There are problems such as data loss and so on. In this way, the contact behavior of magnetic head and magnetic disk has become one of the most important reasons for data loss of current and future magnetic storage devices. However, it is difficult to provide technical support for magnetic head/ disk contact demagnetization. In this paper, the magnetic behavior of magnetic head/ disk contact is studied by using micro-magnetic simulation method, finite element method and experimental method, which covers the following aspects: based on the influence of plastic deformation on the magnetic domain, this paper starts from the two aspects of dislocation pinning and residual stress. Magnetic plastic energy and magnetic stress energy can be calculated by using domain wall pinning model and inverse magnetic resonance principle. In addition, the characteristics of vector characteristics, tensile properties and film thickness are added into the magnetoplastic energy. Thus, based on these two energy formulas, a magnetic plastic model based on micro-magnetic theory is established. In addition, two methods of solving the magnetic plastic model based on the micro-magnetic theory are also put forward, and the construction of the magnetic plastic model is perfected. In this paper, the magnetic behavior of magnetic head/ disk contact is simulated by nano scratch test, and a quantitative detection method is proposed by using the principle of phase imaging of magnetic microscope, thus defining the critical demagnetization condition of magnetic disk and the contact force of magnetic head/ disk. The damage degree of the disk surface and the influence of the number of repeated strokes of the head/ disk on the magnetic change of the magnetic disk. Subsequently, based on the magnetic head/ magnetic disk sliding contact finite element model and the magnetic plastic model, the process of magnetic disk magnetization due to the magnetic behavior of the magnetic head/ disk can not be obtained. Moreover, the correctness of the constructed magnetic plasticity model is verified by the comparison and analysis of magnetic characteristics of magnetic disk media and simulation results. By combining the random thermal perturbation term, Voronoi model characteristic and the magnetic plastic model, a Voronoi micro-magnetic simulation model involving thermal coupling is established, and the plastic strain/ elastic stress under the influence of temperature is obtained. the dependence of the directivity and the tensile force and the magnetization of the perpendicular magnetic recording medium. in turn, a finite element model of high speed sliding contact of a magnetic head/ disk is established, and the influence of magnetic moment deflection change on the attenuation of the magnetic information during the magnetic head/ disk contact demagnetization process is further disclosed, and the contact force of the magnetic head/ disk is obtained, The effect of scratch speed on the SNR of the medium associated with the transition noise. Finally, using the collision experiment of stainless steel ball and magnetic disk, the correctness of the finite element model of high speed sliding contact of magnetic head/ disk and Voronoi micro-magnetic simulation model is determined. Under the action of magnetic head/ disk contact, this paper obtains the influence law of anti-contact demagnetization performance of magnetic disk media by changing the material thermodynamics properties of magnetic disk media, the magnetic properties of magnetic disk media and the magnetic properties of materials and the interface parameters of magnetic head/ disk contact. thereby realizing the purpose of improving the high temperature resistance, the high stress response ability of the magnetic recording layer or keeping the good recording state of the magnetic recording layer. It is pointed out that this paper also gives consideration to the problem of preventing the contact demagnetization of magnetic disk media. "Three Difficult Position" a solution to the problem.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TP333.3
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相關(guān)博士學(xué)位論文 前1條
1 劉育良;磁盤力磁特性和熱力耦合作用下接觸退磁行為研究[D];哈爾濱工業(yè)大學(xué);2016年
，本文編號：2260175
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