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2009 Asia-Pacific Magnetic Recording Conference最新文献

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Production of magnetic nanocomposite by partial reduction of barium hexaferrite via mechanical ball milling 机械球磨法部分还原六铁氧体钡制备磁性纳米复合材料
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925379
M. Molaei, A. Ataie, S. Raygan
{"title":"Production of magnetic nanocomposite by partial reduction of barium hexaferrite via mechanical ball milling","authors":"M. Molaei, A. Ataie, S. Raygan","doi":"10.1109/APMRC.2009.4925379","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925379","url":null,"abstract":"Barium hexaferrite is a hard magnetic ceramic with superior magnetic properties and also low cost of production. Magnetic nanocomposites are a new grade of magnetic materials which exchange coupling may occur between their constituent phases due to their small particle sizes. In this work, barium hexaferrite nanocomposites were produced by partial reduction during ball milling with carbon and subsequent heat treating. Mechano-chemical process of barium hexaferrite powder with carbon can result in magnetic nanocomposites of this material. The effect of milling parameters on crystallite size and magnetic phases were investigated by XRD. Magnetic properties were measured using VSM.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124953997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Observation of scratch on magnetic media by, using thermal infrared camera 热红外热像仪对磁性介质划痕的观察
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925369
Y. Todtong, N. Suwannafa, P. Rakpongsiri, D. Sompongse, A. Siritaratiwat
{"title":"Observation of scratch on magnetic media by, using thermal infrared camera","authors":"Y. Todtong, N. Suwannafa, P. Rakpongsiri, D. Sompongse, A. Siritaratiwat","doi":"10.1109/APMRC.2009.4925369","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925369","url":null,"abstract":"Decreasing of distance between head and magnetic disk, due to higher data storage density requirement, often causes scratches on the magnetic media. In order to scratch failure improvement, a practical technique for measuring or monitoring scratch on media in manufacturing is in demand. In this paper, a technique of media scratched detection by using thermal infrared camera is proposed. It is found that, in order to visibly detect a micrometer-size of scratch, the thermal infrared camera must be taken at right angle to the media and a shorter time of current biasing shows a better result on scratch detection.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116774612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
New ABS trailing pad structure with improved thermal protrusion efficiency 新型ABS拖尾垫结构，提高热伸效率
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925364
L. Gonzaga, B. Liu
{"title":"New ABS trailing pad structure with improved thermal protrusion efficiency","authors":"L. Gonzaga, B. Liu","doi":"10.1109/APMRC.2009.4925364","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925364","url":null,"abstract":"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.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114864760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Observation of head touch down using AE sensor 用声发射传感器观察头部着地
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925402
Z. Deng, L. Su, E. Lam, M. Kubota
{"title":"Observation of head touch down using AE sensor","authors":"Z. Deng, L. Su, E. Lam, M. Kubota","doi":"10.1109/APMRC.2009.4925402","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925402","url":null,"abstract":"In this study, an AE sensor system with a high sampling frequency was used to observe the AE signal when a magnetic head touch down by DFH power in a spin-stand tester. The AE signal was analyzed by FFT via band filter to get ingredient in various frequencies. It was found that the happening time of AE signal with different frequency was different due to the contact situation. The measured information about the presented frequency and happening time were used to analyze and estimate the contact situation. It was attempted to understand how head touch down gives impact on the slider and suspension. The design concept will be also discussed according to head touch down behaviors.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132700897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
On a review of EM-induced noise and vibro-acoustic transmission in HDD spindle motors 硬盘主轴电机电磁噪声及振动声传输研究进展
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925395
T. Jintanawan, A. Sillapapinij, N. Ajavakom
{"title":"On a review of EM-induced noise and vibro-acoustic transmission in HDD spindle motors","authors":"T. Jintanawan, A. Sillapapinij, N. Ajavakom","doi":"10.1109/APMRC.2009.4925395","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925395","url":null,"abstract":"This research presents a mechanism of noise generation in HDD spindle motors. The EM-induced vibration and its transmission through the motor structure are revealed. The flexural vibration energy that is capable of transforming to sound is then analyzed through the EM-excited modal testing.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133066108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of deposition conditions on roughness and corrosion behavior of stacked CoCrPt:SiO2PMR media 沉积条件对CoCrPt:SiO2PMR堆积介质粗糙度和腐蚀行为的影响
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925361
J. Zhao, S. Piramanayagam, J. Hu
{"title":"Effect of deposition conditions on roughness and corrosion behavior of stacked CoCrPt:SiO2PMR media","authors":"J. Zhao, S. Piramanayagam, J. Hu","doi":"10.1109/APMRC.2009.4925361","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925361","url":null,"abstract":"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.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123255063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic contact with friction of an ultra-low flying head-disk interface with thermal protrusion 具有热突的超低飞行头盘界面的动态摩擦接触
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925390
A. Vakis, Sung-Chang Lee, A. Polycarpou
{"title":"Dynamic contact with friction of an ultra-low flying head-disk interface with thermal protrusion","authors":"A. Vakis, Sung-Chang Lee, A. Polycarpou","doi":"10.1109/APMRC.2009.4925390","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925390","url":null,"abstract":"A dynamic two-degree-of-freedom contact with friction model of the head-disk interface (HDI) is presented accounting for slider thermal protrusion and its influence on the HDI dynamics. Using this model, which includes roughness, the applied power to the thermal protrusion is calculated that leads to minimum flying-height modulations. The model predictions are verified by drive-level experimental results.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123052675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A micromechatronics analysis of HDD spindle motors for the terabit era 太比特时代HDD主轴电机的微机电分析
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925397
M. Feng, T. Kenjo, W. Lu
{"title":"A micromechatronics analysis of HDD spindle motors for the terabit era","authors":"M. Feng, T. Kenjo, W. Lu","doi":"10.1109/APMRC.2009.4925397","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925397","url":null,"abstract":"In order to bridge the relational gap existing between control algorithm, driving circuit, rotor and bearing, a numerical algorithm for micro mechatronics simulation is developed for HDD spindle motors. The influences of PWM modes and driving circuit parameters on startup characteristics are investigated to demonstrate the importance of the proposed method.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131438701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel analysis of emergency parking considering a track-seeking motion 考虑寻迹运动的紧急停车分析
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925413
Yonghyun Lee, Ki-Hoon Kim, Seokhwan Kim, N. Park, Young-Pil Park, Kyoung-Su Park
{"title":"A novel analysis of emergency parking considering a track-seeking motion","authors":"Yonghyun Lee, Ki-Hoon Kim, Seokhwan Kim, N. Park, Young-Pil Park, Kyoung-Su Park","doi":"10.1109/APMRC.2009.4925413","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925413","url":null,"abstract":"Most hard disk drives use a ramp load/unload (L/UL) technology because of its many advantages. Despite of these advantages, it was too difficult for engineers to design the mechanism using only experiments, and then there has been numerical simulation of L/UL process. However, the unloading process actually progresses in a dynamic state moving a slider from the disk to the ramp. In particular, an emergency parking unloading with very fast velocity should be considered an effect of a dynamic slider motion. In this paper, we propose a novel analysis of emergency parking which includes the dynamic slider motion considering a skew and velocity effect by a track-seeking motion.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114868630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of contact velocity and tribo charge intensity 接触速度和摩擦电荷强度的研究
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 2009-05-15 DOI: 10.1109/APMRC.2009.4925384
Sheng-bin Hu, Zhi-Min Yuan, S. Leong, B. Santoso, C. Ong, Bo Liu
{"title":"Study of contact velocity and tribo charge intensity","authors":"Sheng-bin Hu, Zhi-Min Yuan, S. Leong, B. Santoso, C. Ong, Bo Liu","doi":"10.1109/APMRC.2009.4925384","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925384","url":null,"abstract":"This paper reports authors experimental investigation on head-disk contact velocity and tribo charge intensity. Measurements of trobo currents divide into three parts, deceleration, constant velocity and acceleration at various initial velocities (vi). It is observed that tribo current appears at different linear velocity for different disk initial velocity vi. A ripple of tribo current at large initial velocity during disk constant speed is observed while the slider is dragging on the disk surface. A calculation of tribo charge current at different initial velocity vi is similar with the observations.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125455704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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