Magnetic recording-head positioning at very high track densities using a microactuator-based, two-stage servo system

Fan, Long-Sheng; Ottesen, H.H.; Reiley, T.C.; Wood, Roger

doi:10.1109/41.382132

Cited by 145 publications

(8 citation statements)

References 15 publications

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“…Due to the rapid growth of information technology, small and high capacities are the requirements of state-of-the-art data storage system. Recently, several approaches to obtain high-density data storage have been widely investigated on the basis of MEMS technologies such as magnetic hard disk drives [1][2][3], magnetic-optical recording [4] and AFM tip recording [5,6]. To increase the data storage density of the optical data storage system is also another design consideration.…”

Section: Introductionmentioning

confidence: 99%

Integrated bi-directional focusing and tracking actuators in a monolithic device for a MEMS optical pick-up head

Wu¹,

Fang²

2006

J. Micromech. Microeng.

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This work presents a miniaturized two-degree-of-freedom (2-DOF) optical pick-up head implemented using MEMS technology. This device contains novel bi-directional vertical comb-drive actuators to act as the focusing positioner, and V-beam thermal actuators to serve as the tracking positioner. In addition, a UV-cured polymer droplet is used for an objective lens. Particularly, the focusing and tracking actuators are monolithically fabricated and integrated in a single device. Electrical routing and isolation is also available by poly-Si and Si3N4 multi-layers for 2-DOF operation. In applications, the proposed device has been successfully fabricated and characterized. The upward and downward displacements of the focusing optical pick-up head are 4.6 µm and 4.1 µm, respectively, at a 30 V driving voltage. And the in-plane displacement of the tracking optical pick-up head is ±16.3 µm, at a 5 V driving voltage. The resonant frequencies of the focusing and tacking systems are 1.9 kHz and 4.1 kHz, respectively.

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Section: Introductionmentioning

confidence: 99%

Integrated bi-directional focusing and tracking actuators in a monolithic device for a MEMS optical pick-up head

Wu¹,

Fang²

2006

J. Micromech. Microeng.

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“…HDDs commonly utilize a voice coil motor (VCM) for track seeking and track following to satisfy these characteristics. In the future, however, the specifications for HDDs will be a recording density of 10 Gb in −2 , a track density of 25 kTPI and the servo bandwidth of 2 kHz, which requires a 1 µm track width, ±0.1 µm tracking accuracy and a greater than 2 kHz servo bandwidth [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Since conventional servo actuators cannot provide this level of track accuracy, a new microactuator to realize a system with the recording density of 10 Gb in −2 is needed. Several types of microactuator are being developed based on electrostatic [2,3,5], electromagnetic [6,7], piezoelectric [8], thermal and shape memory principles. Among these, the electrostatic, electromagnetic and piezoelectric types are frequently used as microactuators for HDDs.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of an electrostatic track-following micro actuator for hard disk drives using SOI wafer

Kim¹,

Chun²

2000

J. Micromech. Microeng.

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This paper presents track-following control using an electrostatic microactuator for super-high density hard disk drives (HDDs). The electrostatic microactuator, a high aspect ratio track-following microactuator (TFMA) which is capable of driving 0.3 µg magnetic head for HDDs, is designed and fabricated by a microelectromechanical systems process. It was fabricated on a silicon on insulator wafer with a 20 µm thick active silicon layer and a 2 µm thick thermally grown silicon dioxide layer; a piggyback electrostatic principle was used for driving the TFMA. The first vibration mode frequency of the TFMA was 18.5 kHz, which is enough for a recording density of higher than 10 Gb in −2 . Its displacement was 1.4 µm when a 15 V dc bias plus a 15 V ac sinusoidal driving input was applied and its electrostatic force was 50.4 µN when the input voltage was 30.7 V. A track-following feedback controller is designed using a feedback nonlinear compensator, which is derived from the feedforward nonlinear compensator. The fabricated actuator shows 7.51 dB of gain margin and 50.98 • of phase margin for a 2.21 kHz servo bandwidth.

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“…While most dual stage designs are PZT-based, some researchers have attempted to manufacture electrostatic micro-actuators. Fan et al (1995) implemented a milli-actuator, which is a micro-actuator that operates at the slider level instead of at the suspension level. A more in-depth analysis of the milli-actuator proposed by Fan et al, was presented by Hirano et al (1998).…”

Section: Dual Stage Actuator Headmentioning

confidence: 99%

Design of a dual stage actuator tape head with high-bandwidth track following capability

et al. 2009

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As tape recording density increases, high-frequency track following capability of the tape head actuator becomes more important. This paper details the mechanical design and experimental analysis of a dual state actuator tape head. The dual stage actuator design combines a traditional voice coil motor for low frequency track following with a piezoelectric actuator for high-frequency track following. Non-parametric and parametric modeling techniques are used in the analysis of the dual stage actuator. The performance of the dual stage actuator head shows good correlation with the model and will enable improved track following capability for future high-performance tape drives.

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Magnetic recording-head positioning at very high track densities using a microactuator-based, two-stage servo system

Cited by 145 publications

References 15 publications

Integrated bi-directional focusing and tracking actuators in a monolithic device for a MEMS optical pick-up head

Integrated bi-directional focusing and tracking actuators in a monolithic device for a MEMS optical pick-up head

Fabrication of an electrostatic track-following micro actuator for hard disk drives using SOI wafer

Design of a dual stage actuator tape head with high-bandwidth track following capability

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