Magnetic printing technology-application to HDD

Ishida, T.; Miyata, K.; Hamada, Tomoko; Hashi, H.; Ban, Yasuaki; Taniguchi, Koji; Saitô, Akira

doi:10.1109/tmag.2003.808983

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…A more recent approach to patterning servo information and mass replication of content onto magnetic disk media is the use of magnetic lithography [9,[182][183][184][185][186]. In this process, a magnetic pattern on one substrate, the master or mask, is transferred using an applied magnetic field to a magnetic film on a second substrate, sometimes referred to as a slave.…”

Section: Patterned Servomentioning

confidence: 99%

“…The magnetic mask selectively shields the slave disk from the external field, thus transferring the mask pattern into a magnetic pattern on the disk. This process requires intimate contact between the mask and slave disk, which has been demonstrated using flexible PET magnetic masks [9,182], rigid Si masks with flexible disks such as metal tape [187], and rigid masks with air channels and vacuum [185]. Magnetic patterns have also been transferred when the master is fabricated by etching a substrate and subsequently coating the entire surface with a soft magnetic film, so that the grooves as well as the lands are coated.…”

Section: Patterned Servomentioning

confidence: 99%

“…The potential lifetime of a master is a critical issue when considering the economic viability of magnetic lithography. Ishida et al [185] have shown that over one million disks may be printed from a single master. The magnetic performance of such patterned media have been investigated by Bandic et al [182] and Ishida et al [185].…”

Section: Patterned Servomentioning

confidence: 99%

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Nanofabricated and self-assembled magnetic structures as data storage media

Terris

Thomson

2005

J. Phys. D: Appl. Phys.

794

525

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Nanofabrication of magnetic storage media, where servo marks, discrete tracks or individual islands are defined, offer the prospect for improved performance and increased areal density. However, this increase in performance will require that new and additional processes be introduced into disk manufacturing. We review here the fundamental patterning and fabrication processes that have been proposed, along with their respective strengths and weaknesses and the potential advantages they may offer for magnetic recording. The increase in data density afforded by nanofabrication may have added significance as more conventional approaches to ever increasing density will encounter physical limitations set by the thermal stability of the recorded bits.

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Section: Patterned Servomentioning

confidence: 99%

Section: Patterned Servomentioning

confidence: 99%

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Nanofabricated and self-assembled magnetic structures as data storage media

Terris

Thomson

2005

J. Phys. D: Appl. Phys.

794

525

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“…graphically patterned master disk proposed in [36]. A magnetic film patterned according to the information signal to be printed on slave disks is processed by a lithography technique on the master disk.…”

Section: Fig 18 Shows a New Magnetic Contact Duplication Technologymentioning

confidence: 99%

“…leaks and correspondingly reverses the initial magnetization on the slave disk at the portion between the neighboring patterned films, and magnetic signal information according to the magnetic film pattern on the master is printed on the slave disk. Figure 1.8: Magnetic printing method by using a lithographically patterned master disk [36].…”

Section: Fig 18 Shows a New Magnetic Contact Duplication Technologymentioning

confidence: 99%

High precision motion control for hard disk drive systems

Teoh¹

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The demand for better servo control technology for hard disk drives (HDDs) never ceases. One important element for HDDs servo control is better precision for future drives with ultrahigh densities. As the track density increases, the amount of time required for the process of writing servo information onto the disks will also increase accordingly. However, the cost of production must be kept low. Since HDDs are manufactured in mass production, the servo control design for the voice coil motor (VCM) actuator has to be robust towards uncertainty. At the same time, the track misregistration (TMR) during track following has to be minimized. These two requirements can be formulated into a mixed H 2 /H ∞ control problem. Therefore, a new mixed H 2 /H ∞ control design via a linear matrix inequality (LMI) based approach is proposed. By an equivalent transformation of Lyapunov matrix inequality, additional slack variables are introduced to characterize both the H 2 and H ∞ performances. This offers additional degree of freedom in optimizing the mixed H 2 /H ∞ performance, and thus, resulting in equal or better performance than existing LMI based methods. It is generally difficult to attenuate high frequency disturbances of a system due to waterbed effect of the sensitivity function. However, attenuation of dominant narrow-band disturbances is possible. Therefore, a technique that combines a disturbance observer with a phase stabilized controller is proposed for rejection of narrow-band disturbances at two different frequencies, which are higher than the servo bandwidth. The phase stabilized controller is designed first to attenuate a high frequency disturbance. Then, the disturbance observer is added into the loop in order to reject another high frequency disturbance, without affecting the stability of the feedback control loop. Previous research has shown that the sensitivity function can be shaped such

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Trends in Magnetic Recording Media

2008

From Bulk to Nano

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Magnetic printing technology-application to HDD

Cited by 12 publications

References 10 publications

Nanofabricated and self-assembled magnetic structures as data storage media

Nanofabricated and self-assembled magnetic structures as data storage media

High precision motion control for hard disk drive systems

Trends in Magnetic Recording Media

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