2009 Asia-Pacific Magnetic Recording Conference

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1 2009 Asia-Pacific Magnetic Recording Conference (APMRC) Singapore January 2009 IEEE Catalog Number: ISBN: CFP09791-PRT

2 TABLE OF CONTENTS SESSION AA: HDI DYNAMICS AND PRECISION MOTION CONTROL Study of Head-Disk Interaction and Spacing Based on Readback Signal...1 Z. Fan, Z. Zhang, H. Tang Dynamic Contact With Friction Of An Ultra-low Flying Head-disk Interface With Thermal Protrusion...3 A. I. Vakis, S.-C. Lee, A. A. Polycarpou SESSION AB: MICRO-ACTUATOR, SERVO AND CONTROL Smoothing Position Error Signal Corrupted By Impulse Disturbance...5 C. Du, Z. Ye, T. Gao, L. Xie, J. Zhang, Y. Wang Active Correction of Mass Imbalance for a Precise Rotor...7 J. K. Lee, Y. S. Ihn, J. C. Koo Control Design for Self-Servo Track Writing Using a State-Space Disturbance Observer...9 H. Kang, C. Lee, C. Chung SESSION BA: MOTOR AND BEARING HDD Spindle Motor System Design For Data Recording With Ultrahigh TPI...11 B. Chao On Review of EM-Induced Noise and Vibro-Acoustic Transmission in HDD Spindle Motors...13 T. Jintanawan, A. Sillapapinij, N. Ajavakom Dynamics of a HDD Spindle System Due to the Change of FDBs...15 G. H. Jang, K. Y. Park A Micromechatronics Analysis of HDD Spindle Motors for the Terabit Era...17 M. Feng, T. Kenjo, W. Lu SESSION BB: AIRFLOW, HEAT TRANSFER AND MECHANICS Whole-HDD Structure Airflow-Simulation by Voxel Mesh Method...19 M. Ikegawa, H. Mukai, M. Watanabe Flow Induced Slider Vibration in a Functional HDD: Influence of Air Shroud...21 K. Sundaravadivelu, Q. D. Zhang, N. Y. Liu, E. H. Ong, T. H. Yip, G. L. Chin POSTER SESSION BP: HDI DYNAMICS AND PRECISION MOTION CONTROL An Experimental Study of Head-Disk Clearance Sensitivity and Instabilities in Magnetic Recoding Heads with Adaptive Flying Height...23 D. Tongsomporn, K. Vongsarath, R. Sivaratana, N. Afzulpurkar

3 In-situ Measurement of Reader Gap Length...25 W. Wang, H. Huo, V. Tan Observation of Head Touch Down Using AE Sensor...27 Z. Deng, L. Su, M. Kubota POSTER SESSION BQ: MICRO-ACTUATOR, SERVO AND CONTROL Servo Performance Analysis and PES Prediction for Patterned Media Technology...29 F. Hong, W. E. Wong, S. Zhang, J. N. Teoh Automated 2D/3D Scanning and Evaluation of Written Data on Spinstand...31 K. K. Teo, K. S. Chan, W. E. Wong Optimal Reset Control for a Hard Disk Drive Dual-Stage Actuator System...33 H. Li, C. Du, Y. Wang, Y. Guo POSTER SESSION BR: MOTOR AND BEARING Dynamic Characteristics of a HDD Spindle System Due to Imperfect Roundness of Shaft...35 G. H. jang, H. W. Kim, K. M. Jung An Evaluation Method for Spindle Motor Runout Measurement...37 J. C. Huang, C. Bi POSTER SESSION BS: AIRFLOW, HEAT TRANSFER AND MECHANICS A Numerical Study of the Operational Shock Response in A Hard Disk Drive Using the Discrete Stiffness Method...39 H. Zheng, H. Li, F. E. Talke Swaging Force Control in Drive Resonance Response...41 A. Jiao, Z. Liu, L. Pan, M. Ying Design Cosiderations for Reducing Shock Responses of a Micro-Drive...43 B. J. Shi, W. Shu, B. Gu Hybrid Continuum-DSMC and Particle-Laden Flow Modeling in the Head-Disk Interface Gap...45 J. Benzi, M. Damodaran Modeling and Prediction of Structure-borne Seek Noise of HDDs...47 H. Zheng, J. Q. Mou, W. Z. Lin, E. H. Ong A Novel Analysis of Emergency Parking Considering a Track-Seeking Motion...49 Y. Lee, K.-H. Kim, S. Kim, N.-C. Park, Y.-P. Park, K.-S. Park Impacts of Windowed Backing Layer on Write-to-Read Coupling on Suspension Interconnection...51 K. Prachumrasee, S. Swatdiponphallop, R. Sivaratana, N. Chankum, L. Ung, A. Siritaratiwat Feasiblitiy of Modeling Air Bearing as Linear Springs in Hard Disk Drive...53 M. J. Liu, W. Z. Lin, F. F. Yap, E. H. Ong

4 SESSION CA: AIRFLOW, HEAT TRANSFER AND MECHANICS Numerical HDD Seek Acoustic Transfer Analysis and Experimental Validation...55 F. Gao, W. Z. Lin, C. W. Lee, J. Q. Mou, E. H. Ong Analysis of Built-in Speaker Induced Structural-Acoustic Vibration of Hard Disk Drives in Notebook PC...57 Y. Y. Hu, S. Yoshida, S. Nakamura, K. Watanabe, W. Z. Lin, E. T. Ong, J. Q. Mou Fluid Structure Interaction Analysis in a Disk Drive...59 M. Kazemi Minimization of Flexible Cable Settling PES in High TPI HDD via Mechatronic Integration...61 J.-Y. Chang SESSION CB: LUBE, OVERCOAT, AND TRIBOLOGY Lubricant Behavior Simulation with Particle Method...63 E. Ishii, H. Kohira Conformation of Ultra-thin PEPE Lubricant with Different Structure on Magnetic Disks - Direct Observation and MD Simulation H. Tani, K. Sakamoto, N. Tagawa Spreading Properties of Monolayer Lubricant Films: Effect of Bonded Molecules...67 S. Itoh, K. Takahashi, K. Fukuzawa, H. Zhang SESSION DA: HDI DYNAMICS AND PRECISION MOTION CONTROL Nano-Motion Stage for High Speed and Precision Positioning on an X-Y Plane...69 S. Mori, Y. Sato, A. Sakurada, A. Naganawa, Y. Shibuya, G. Obinata Head Disk Interface Dynamic Stability Analysis for Surfing Recording...71 S. K. Yu, B. Liu, W. D. Zhou, W. Hua, L. Gonzaga Numerical Simulation of the Head/Disk Interface for Bit Patterned Media...73 H. Li, F. E. Talke SESSION DB: INTEGRATION, TESING AND FUTURE HDD TECHNOLOGIES Mitigation of Tack Following RRO in High TPI Hard Disk Drives Through Servo and Mechanical Designs...75 J.-Y. Chang Integration of Light Delivery For Heat Assisted Magnetic Recording...77 M. Hirata, M. Oumi, M. Park, S. Tanabe, N. Chiba, L. Gonzaga, S. Yu, M. Zhang, F. Tjiptoharsono POSTER SESSION DP: AIRFLOW, HEAT TRANSFER AND MECHANICS Investigation of Flow Disturbance by Disk-shroud Configuration of Servo Track Writer...79 D.-W. Kong S.-J. Kim, W. Kim, C. Lee

5 Optimal Magnet Shape Design for Wideband Magnetic Bias Torque in a Hard Disk Drive...81 W. Kim, B.-S. Kim, W. Kim, C. Lee Optimal Arm Configuration to Reduce Arm Bending Resonance-Induced Off-Track in a Hard Disk Drive...83 W. Kim, Y.-H. Song, W. Kim, C. Lee Vibration Characteristics of Hard Disk Drives with Different Internal Air Pressures...85 Z. He, V. Venkataramanan, C. Y. Ng, E. H. Ong Numerical Investigation of Thermal Problems in HAMR System...87 Q. D. Zhang, B. X. Xu, J. Zhang, N. Y. Liu, G. L. Chin, K. Sundaravadivelu, E. H. Ong, D. Y. Li Three Dimensional Finite Element Model for Transient Temperature Prediction in Hard Disk Drive...89 C. P. H. Tan, J. P. Yang, J. Q. Mou, E. H. Ong POSTER SESSION DQ: LUBE, OVERHEAT AND TRIBOLOGY Nano/Micro-Reological Characteristics of Polymeric Lubricant for Hard Disk Drive...91 P. S. Chung, Q. Guo, M. S. Jhon, H. J. Choi Large Magnetic Moment Obtained in Cu-doped ZnO Nanoclusters...93 J. Y. Cheong, T. Chen, B. K. Tay, B. Liu, B. C. Lim Effect of Deposition Conditions on Roughness and Corrosion Behavior of Stacked CoCrPt:Si0 2 PMR Media...95 J. M. Zhao, S. N. Piramanayagam, J. F. Hu Nitrogen Doping in Tetrahedral Carbon and its Effect on Lubricant Bonding...97 Y. Mingchu, Z. Mingsheng, Z. Jinmin, L. Bo POSTER SESSION DR: HDI DYNAMICS AND PRECISION MOTION CONTROL Characteristics of Slider Flying Considering Track-Seeking Performance Over Discrete Track Media...99 K.-H. Kim, Y. Lee, S. Kim, N.-C. Park. Y.-P. Park, K.-S. Park New ABS Trailing Pad Structure With Improved Thermal Protrusion Efficiency L. Gonzaga, B. Liu Stabilities of Sub-5 nm Air Bearing Slider W. Hua, B. Liu, S. Yu, W. Zhou Mechanical Performance Study of Pattern Media Based Head-Disk System S. Shen, B. Liu, S. Yu, H. Du Further Study of the Effect of Water Vapor on Slider Air-Bearing Y. S. Ma, B. Liu POSTER SESSION DS: INTEGRATION, TESTING AND FUTURE HDD TECHNOLOGIES Probabilistic Analysis of Off-Track Capability for Higher Density Disk Drives K. Aruga

6 Observation of Scratch on Magnetic Media by Using Thermal Infrared Camera Y. Todtong, N. Suwannata, P. Rakpongsiri, D. Sompongse, A. Siritaratiwat Slider-disk Contact Characterization Using MR Sensor as Transducer L. Ng, M. S. Zhang, Y. S. Ma, B. Liu Media Testing Technology for Magnetic Defects Detection and Measurement S. H. Leong, B. Santoso, C. L. Ong, J. B. Lim, S. B. Hu, Z. Yuan SESSION EA: MOTOR AND BEARING Position Error Predictions of a Hard Disk Drive Undergoing a Large Seeking Motion with Shock Excitations T.-L. Wu, I. Y. Shen Simulation of PES Degradation Due to Operational Vibration for Hard Disk Drives in Storage Server Box T. Eguchi SESSION EB: MICRO-ACTUATOR, SERVO AND CONTROL Flexible Support Mechanism for Hard Disk Drives Y. Matsuda, S. Nakamura, M. Sega, Y. Katou RRO/NRRO Characteristics in Mobile HDDs K. Akagi POSTER SESSION EP: MOTOR AND BEARING Contactless Measurement Method for HDD Spindle Motor Parameters C. S. Soh, C. Bi, Z. H. Yong, C. P. Lim POSTER SESSION EQ: MICRO-ACTUATOR, SERVO AND CONTROL Enhanced Vibration Suppression In HDDs Using Instrumented Suspensions S. Felix, R. Horowitz Robust Friction Compensation in HDDs Z. Wang, C. Du POSTER SESSION ER: INTEGRATION, TESTING AND FUTURE HDD TECHNOLOGIES Production of Magnetic Nanocomposite by Partial Reduction of Barium Hexaferrite via Mechanical Ball Milling M. J. Molaei, A. Ataie, Sh. Raygan Dynamic Force Measurement of Head Arm Assembly of a Hard Disk Drive by Numerical Analysis and Experiments B. Gu, D. W. Shu, Y. Fujii, B. J. Shi

7 POSTER SESSION ES: LUBE, OVERCOAT AND TRIBOLOGY Lubricant Deformation Analyses Caused by Gas Stresses and Surface Tension F. Saeki, S. Fukui, H. Matsuoka The Corrosion Resistant Property of Media Lubricant R. Ji, J. Zhang, B. Xu, T. K. L. Dao, J. Xu, T. Liew Tribocurrent and Its Application in Study of Slider-Lubricant Interaction Y. Man, B. Liu, Y. Ma, S. K. Sinha, S. C. Lim Study of Contact Velocity and Tribo Charge Intensity S. Hu, Z. Yuan, S. H. Leong, B. Santoso, C. L. Ong, B. Liu SESSION FA: LUBE, OVERCOAT AND TRIBOLOGY Fundamental Understanding of Vapor Lubrication in Hard Disk Drive Y. S. Ma, B. Liu Advanced Head Disk Interface System Assisted by Gas PFPE Lubrication H. Matsumoto, H. Tani SESSION FB: INTEGRATION, TESTING AND FUTURE HDD TECHNOLOGIES Perspectives of Magnetic Recording System at 10 Tb/in² Z. Yuan, B. Liu, T. Zhou, C. K. Goh, C. L. Ong, L. Wang The Road to HAMR W. A. Challener, C. Peng, A. V. Itagi, D. Karns, Y. Peng, X. Yang, X. Zhu, N. J. Gokemeijer, Y.-T. Hsia, G. Ju, R. E. Rottmayer, M. A. Seigler, E. C. Gage Author Index

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