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Magnetic Recording Conference, 2009. APMRC '09. Asia-Pacific

Date 14-16 Jan. 2009

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  • [Front cover]

    Publication Year: 2009 , Page(s): 1
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  • [Blank page]

    Publication Year: 2009 , Page(s): 1
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  • [Title page]

    Publication Year: 2009 , Page(s): 1
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  • Copyright ©

    Publication Year: 2009 , Page(s): 1
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  • Conference committee

    Publication Year: 2009 , Page(s): 1
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  • [Conference location layout]

    Publication Year: 2009 , Page(s): 1
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  • Conference program at a glance

    Publication Year: 2009 , Page(s): 1
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  • [Blank page]

    Publication Year: 2009 , Page(s): 1
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  • Conference program

    Publication Year: 2009 , Page(s): 1 - 21
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  • Author index

    Publication Year: 2009 , Page(s): 1 - 4
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  • Sponsors

    Publication Year: 2009 , Page(s): 1 - 3
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  • [Blank page]

    Publication Year: 2009 , Page(s): 1
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  • Optimal magnet shape design for wideband magnetic bias torque in a hard disk drive

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1143 KB) |  | HTML iconHTML  

    In order to prevent the swing arm parked on the ramp from rotating due to a rotary shock, a wideband magnetic bias torque is generated on a retract pin. This paper presents the optimal magnet shape to generate a wideband magnetic bias torque. To find the optimal magnet shape, the standard shape optimization is employed. The physics behind why the optimized shape of the magnet yielded better performance is briefly explained using numerical simulation. To verify the effectiveness of the optimized magnet, the actual experiment was conducted. Experimental result shows that the optimized magnet shape generates a wideband magnetic bias torque while maintaining the maximum magnetic bias torque compared to a nominal magnet shape. View full abstract»

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  • Optimal arm configuration to reduce arm bending resonance-induced off-track in a hard disk drive

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1116 KB) |  | HTML iconHTML  

    In order to reduce the off-track due to the arm bending mode, whose effect is considerable in a high capacity drive, an arm configuration with maximum arm bending stiffness should be considered. The objective of this work is to find the optimal arm configuration that maximizes the arm bending stiffness subject to the constraint imposed on the moment of inertia of the arm. Herein, the problem of finding the optimal arm configuration maximizing the arm bending stiffness is formulated as a topology optimization for eigenvalue maximization problem. By applying this method, an arm configuration having two balance holes instead of a single balance hole was obtained. Finally, the efficacy of the optimized arm is verified by measuring the position error signal (PES) of actual sample drives; when the optimized arm was used, the PES was reduced by 25%. View full abstract»

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  • Vibration characteristics of hard disk drives with different internal air pressures

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1029 KB) |  | HTML iconHTML  

    Hard disk drive (HDD) performance and reliability at different environments are the interests and concerns of HDD researchers, engineers and consumers. This paper reports the experimental investigation of HDD vibration characteristics with different internal air pressures. Experiments are done by placing the HDD samples inside an altitude chamber and the vibrations are measured using a Laser Doppler vibrometer (LDV) and all-in-one (AIO) motor tester. The disk drive read/write test, vibration spectrum of actuator & suspension tip and disk flutter measurements reveal that the air pressure significantly affects the vibration behaviors of hard disk drive components and the system performances. View full abstract»

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  • Numerical investigation of thermal problems in HAMR system

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (908 KB) |  | HTML iconHTML  

    The paper numerically investigated two thermal related problems in heat assisted magnetic recording: the dependence of the recorded mark width on the laser power and the temperature distribution and changes with time in lubricant layer at the condition without or with the heat sink layer. The results show that the mark width increases as the laser power increases and heat sink layer helps to reduce temperature in lubricant layer. View full abstract»

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  • Three dimensional finite element model for transient temperature prediction in hard disk drive

    Publication Year: 2009 , Page(s): 1 - 2
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1179 KB) |  | HTML iconHTML  

    Hard disk drive (HDD) is often subjected to transient temperature during frequent seeking or due to the change of environmental conditions that causes HDD reliability problems. This paper presents a three dimensional (3D) finite element modelling technique that can be used to predict the transient temperatures of the HDD when it subjected to transient temperature during frequent seeking or due to the change of environmental conditions. View full abstract»

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  • Nano/micro-reological characteristics of polymeric lubricant for hard disk drive

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (724 KB) |  | HTML iconHTML  

    Rheological properties of shear viscosity and dynamic moduli of perfluoropolyether (PFPE) with different molecular weights and end group functionalities were measured. Molecular simulation of non-equilibrium molecular dynamics (NEMD) was also performed to provide a molecular visualization tool to predict shear viscosity, which reveals a strong dependence on temperature and PFPE molecular architecture. View full abstract»

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  • Large magnetic moment obtained in Cu-doped ZnO nanoclusters

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1192 KB) |  | HTML iconHTML  

    Cu-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. Zn0.985Cu0.014O nanoclusters remained in wurtzite structure with size of 8 nm. Room-temperature ferromagnetism was observed in the Cu doped ZnO nanocluster-assembled film. Moreover, it exhibited a large saturated magnetization of 1.37muB/Cu and increased to 3.68muB/Co after the deposition time was increased. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moments are discussed here. View full abstract»

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  • Effect of deposition conditions on roughness and corrosion behavior of stacked CoCrPt:SiO2PMR media

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (816 KB) |  | HTML iconHTML  

    The columnar grain structure of modern perpendicular recording media (PMR) introduces a nanoscaled rougher topography, making the media be susceptible to contact damage, the poorer coverage of carbon overcoat and severer wear-induced corrosion. In order to understand the details how the deposition conditions affect the PMR tribological performance, a stacked CoCrPt:SiO2 PMR media is proposed and the dependence of its roughness and corrosion behavior on magnetic layer deposition conditions were investigated. The results reveal that the proposed media deposited under the appropriately chosen conditions can improve the surface roughness and corrosion behavior without more compromising the magnetic recording performance. View full abstract»

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  • Nitrogen doping in tetrahedral carbon and its effect on lubricant bonding

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (749 KB) |  | HTML iconHTML  

    Tetrahedral carbon (ta-C) overcoat is deposited on disk. Nitrogen is doped in ta-C and its effect on lubricant bonding is studied. The research shows that nitrogen doping content and sp3/sp2 ratio in carbon are the two key factors to affect the bonding of lubricant with carbon overcoat, the study reveals that lubricant bonding on ta-C is much different with lubricant bonding on sputtered a-C. View full abstract»

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  • Characteristics of slider flying considering track-seeking performance over discrete track media

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (968 KB) |  | HTML iconHTML  

    In this paper, we considered the effect of track-seeking performance over discrete track media. The effects of discrete track media design parameter and radial position are investigated. View full abstract»

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  • New ABS trailing pad structure with improved thermal protrusion efficiency

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1006 KB) |  | HTML iconHTML  

    A new trailing pad structure with partially-etched pad is proposed. The effect of the pad shape, trench depth and width was numerically investigated and presented. The thermal protrusion efficiency of the new ABS design which has adopted the new trailing pad structure is also presented. View full abstract»

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  • Stabilities of sub-5 nm air bearing slider

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1476 KB) |  | HTML iconHTML  

    The work done by various forces acting on the air bearing slider are analyzed and calculated, and their contributions to the flying stabilities of a sub-5 nm air bearing slider are evaluated quantitatively. It is found that the air bearing force plays an important role on the slider's flying stabilities, while the intermolecular force and the friction force tend to excite the slider bouncing. View full abstract»

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  • Mechanical performance study of pattern media based head-disk systems

    Publication Year: 2009 , Page(s): 1 - 2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (884 KB) |  | HTML iconHTML  

    In the pursuit of areal recording densities towards 10 Tb/in2, patterned media technology as well as the technology to reduce magnetic spacing between the slider and disk have attracted great attention. As a result, contact stresses can be encountered at the head-disk interface (HDI). Detailed knowledge of the stress distribution due to inelastic deformation at asperity microcontacts is therefore of great importance. An elastic-plastic contact analysis for the HDI that is based on a finite element model and two typical pattern media cases is presented in this work. Simulation results for the contact pressure at asperity microcontacts and subsurface von Mises equivalent stress are interpreted in terms of two typical pattern media cases. View full abstract»

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