Unshielded capacitor probe technique for determining disk memory ceramic slider flying characteristics

Briggs, George R.; Herkart, P.

doi:10.1109/tmag.1971.1067129

Cited by 13 publications

(4 citation statements)

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“…In an application involving air-lubricated bearings, Ma [4] and Licht [5] studied the dynamics ofse1f-acting foil bearings on a rotating circular drum using aluminized Mylar tape. Dynamic spacing variations were likewise investigated with the capacitance technique by Lin and Beye [6] and by Briggs and Herkart [7] in the study of the magnetic head-disk interface of magnetic recording disk files,…”

Section: Introductionmentioning

confidence: 99%

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Capacitance Probe Study of Rotating-Head/Tape Interface

Feliss¹,

Talke²

1977

IBM J. Res. & Dev.

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A modified version of the capacitance probe technique is used to investigate the head-tape interface in a rotating head configuration. The relationship between air-bearing spacing and contour design is studied as a function oftape tension, head protrusion, and velocity; in addition, the effect of wave dynamics on flying height is examined. IntroductionThe measure of capacitance between adjacent surfaces has been used extensively to study the spacing of bearing surfaces separated by thin lubricant films. Crook [ 1,2] used the technique to measure the spacing in the contact zone between oil-lubricated disks. Archard and Kirk [3] applied the method to study elastohydrodynamic lubrication of crossed cylinders and derived a simple empirical expression for the oil film thickness of the contact zone. In an application involving air-lubricated bearings, Ma [4] and Licht [5] studied the dynamics ofse1f-acting foil bearings on a rotating circular drum using aluminized Mylar tape. Dynamic spacing variations were likewise investigated with the capacitance technique by Lin and Beye [6] and by Briggs and Herkart [7] in the study of the magnetic head-disk interface of magnetic recording disk files,In the work reported in [4] through [7] the capacitance method was found especially useful because it furnished dynamic spacing information. This latter information is desirable in the design of magnetic recording devices, since a recording head has to maintain a stable and uniform transducer/medium spacing.In this communication we use the capacitance probe technique to investigate the behavior of the magnetic head-medium interface in a rotating head configuration [8]. In particular, we have incorporated the capacitance probe in the magnetic head and have studied the headtape flying behavior as a function of contour design, tape tension, and head velocity.

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Section: Introductionmentioning

confidence: 99%

“…In the work reported in [4] through [7] the capacitance method was found especially useful because it furnished dynamic spacing information. This latter information is desirable in the design of magnetic recording devices, since a recording head has to maintain a stable and uniform transducer/medium spacing.…”

Section: Introductionmentioning

confidence: 99%

Capacitance Probe Study of Rotating-Head/Tape Interface

Feliss¹,

Talke²

1977

IBM J. Res. & Dev.

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“…Normally, flying height is measured by optical interferometry [ 1-31, or by capacitance methods [4,5]. These techniques have been used to investigate the flying height loss of a head slider at lower ambient pressure in previous works [6,7].…”

Section: Introductionmentioning

confidence: 99%

Drive-level flying height measurements and altitude effects

1994

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Abstraci -An electrical method was developed to measure the flying height in a sealed drive. In this method, componentlevel measurements were first performed on a PPL interferometer and a Guzik tester. Good correlation was found between the flying height and the pulse width (PW50). Within the range of interest, the PW50 was a linear function of the flying height. Thus, the flying height in the drive was obtained by measuring the PW50. This method was used to study the variation in the flying height due to the reduction in air pressure. Changes in recording properties such as signal amplitude, SNR and O W with the altitude change were also studied.

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“…There are several methods that can be used to accurately measure the separation distances between two flat surfaces with submicrometer resolution, such as capacitive displacement sensors, − thin-film interferometry, − and laser Doppler vibrometry, − all of which require additional components on the detection platform. However, to realize ever smaller separation distances, the hard disk industry has developed techniques to accurately determine nanometer-sized separation distances between the read head and magnetic media by simply measuring the “read back” signal of the MR sensor as it is scanned across the magnetic storage medium at a constant velocity.…”

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confidence: 99%

Frequency-Domain Approach To Determine Magnetic Address-Sensor Separation Distance Using the Harmonic Ratio Method

et al. 2016

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In this work, we describe an approach to determine the distance separating a magnetic address from a scanning magnetoresistive sensor – a critical adjustable parameter for certain bioassay analyses where magnetic nanoparticles are used as labels. Our approach is leveraged from the harmonic ratio method (HRM), a method used in the hard drive industry to control the distance separating a magnetoresistive read head from its data platter with nanometer resolution. At the heart of the HRM is an amplitude comparison of a signal’s fundamental frequency to that of its harmonics. When the signal is derived from the magnetic field pattern of a periodic array of magnetic addresses, the harmonic ratio contains the information necessary to determine the separation between the address array and the read head. The elegance of the HRM is that there is no need of additional components to the detection platform to determine a separation distance; the streaming “bit signal” contains all the information needed. In this work we demonstrate that the tenets governing HRM used in the hard drive industry can be applied to the bioanalytical arena where submicron to 100 μm separations are required.

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Unshielded capacitor probe technique for determining disk memory ceramic slider flying characteristics

Cited by 13 publications

References 1 publication

Capacitance Probe Study of Rotating-Head/Tape Interface

Capacitance Probe Study of Rotating-Head/Tape Interface

Drive-level flying height measurements and altitude effects

Frequency-Domain Approach To Determine Magnetic Address-Sensor Separation Distance Using the Harmonic Ratio Method

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