Strain imaging of magnetic domain structures in the magnetic head of a hard disk drive

Abstract The aim of this paper is to develop the general methodology for the optimum design of magnetic head slider for improving the spacing characteristics between head slider and disk surfaces under the static and dynamic operation conditions of hard disk drive and to present an application of the methodology to IBM 3380-type slider design. In the optimum design, the objective function is defined as the weighted sum of minimum spacing, maximum difference of spacing due to variation of radial location of head and maximum amplitude ratio of slider motion. Slider rail width, taper length, taper angle, suspension position and preload are selected as the design variables. Before the optimization of magnetic head slider, the effects of these five design variables on the objective function are examined by the parametric study, and then the optimum design variables are determined by applying the hybrid optimization technique combining the direct search method and the successive quadratic programming (SQP). From the results obtained, the effectiveness of optimum design on the spacing characteristics of magnetic head slider is clarified.

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Flow induced vibration of magnetic head suspension in hard disk drive

IEEE Transactions on Magnetics ◽

10.1109/tmag.1986.1064621 ◽

1986 ◽

Vol 22 (5) ◽

pp. 1022-1024 ◽

Cited By ~ 10

Author(s):

Y. Yamaguchi ◽

K. Takahashi ◽

H. Fujita ◽

K. Kuwahara

Keyword(s):

Hard Disk Drive ◽

Hard Disk ◽

Disk Drive ◽

Magnetic Head ◽

Flow Induced Vibration

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A Study on Double Gap Magnetic Head Positioning System for Hard Disk Drive

Journal of the Magnetics Society of Japan ◽

10.3379/jmsjmag.18.s1_41 ◽

1994 ◽

Vol 18 (S_1_PMRC_94_1) ◽

pp. S1_41-44

Author(s):

Satoru SEKO ◽

Toru TAKEDA

Keyword(s):

Hard Disk Drive ◽

Hard Disk ◽

Disk Drive ◽

Positioning System ◽

Magnetic Head ◽

Head Positioning

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Strain imaging of a magnetic layer formed on an air bearing surface of a hard disk drive head for perpendicular recording

Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena ◽

10.1116/1.3043457 ◽

2009 ◽

Vol 27 (2) ◽

pp. 997 ◽

Cited By ~ 3

Author(s):

Keiji Takata

Keyword(s):

Hard Disk Drive ◽

Magnetic Layer ◽

Hard Disk ◽

Disk Drive ◽

Strain Imaging ◽

Air Bearing ◽

Bearing Surface ◽

Perpendicular Recording

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Experimental Study of Dual Heater Slider Touchdown Detectability

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.284-287.468 ◽

2013 ◽

Vol 284-287 ◽

pp. 468-472

Author(s):

Da Peng Zhao ◽

Xiong Fei Wei ◽

Yu Wang ◽

Bin Liu ◽

Sheng Xiang Chen ◽

...

Keyword(s):

Experimental Study ◽

Hard Disk Drive ◽

Hybrid Method ◽

Feasible Solution ◽

Hard Disk ◽

Areal Density ◽

Disk Drive ◽

Detection Methods ◽

Magnetic Head ◽

Single Method

With the increase of areal density in hard disk drive (HDD), the mechanical spacing between magnetic head and disk has decreased to sub~1nm. Under such ultra-low spacing, accurate spacing control becomes more important for lowering down the risk of head-disk interference and getting good bit per inch (BPI) performance. Dual-heater slider technology has been considered as a most useful solution. This paper introduces the advantages of dual heater in reading/writing spacing control. Furthermore, as a key issue in precise spacing control, the touchdown detectability of dual-heater slider was also investigated using three TD detection methods under writing and reading mode. Result shows that a single method is difficult to get the best TD detectability under both writing and reading mode. Instead, hybrid method may be a feasible solution.

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The Simulation of Solder Bridging on TuMR Magnetic Head Connector

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.157-158.144 ◽

2012 ◽

Vol 157-158 ◽

pp. 144-148

Author(s):

Reangroaj Roajanasiri ◽

Nitin Afzulpurkar ◽

Siridech Boonsang

Keyword(s):

Product Design ◽

Hard Disk Drive ◽

Cost Reduction ◽

Hard Disk ◽

Disk Drive ◽

Product Performance ◽

Magnetic Head ◽

High Productivity ◽

Market Needs ◽

Rework Process

The Hard Disk Drive is the important components in the present computer. The Hard Disk Drive manufacturing need high productivity and cost improvement to support the market needs. Many cost reduction are done on product design, material cost and manufacturing operation. This work shows an idea to improve productivity and also reduce the scrap cost by rework process. The product performance will be considered to prevent the reduction of reliability and degradation.

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