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Laser-Doppler-Vibrometer on Magnetic Spin-Stand (HSA-PTS)

IP.com Disclosure Number: IPCOM000022389D
Original Publication Date: 2004-Mar-12
Included in the Prior Art Database: 2004-Mar-12
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Abstract

A Polytec laser-doppler-vibrometer (LDV) has been successfully attached to the HSA-PTS spin-stand and an explicit relationship is detected between the amplitude modulation of the magnetic readback signal and a motion vibration of the slider in z-direction. The amplitude modulation is also known as the so-called 'Jami'-error, which leads to read failures within the HDD. The Jamis on the HSA-PTS are generated artificially by lube exposure of the disk surface.

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Laser-

-Doppler

Doppler-

-Vibrometer on Magnetic Spin

Vibrometer on Magnetic Spin -

-Stand

Stand

(((HSAHSAHSA---PTSPTSPTS))

A Polytec laser-doppler-vibrometer (LDV) has been successfully attached to the HSA-PTS spin-stand and an explicit relationship is detected between the amplitude modulation of the magnetic readback signal and a motion vibration of the slider in z-direction.

    The amplitude modulation is also known as the so -called 'Jami'-error, which leads to read failures within the HDD. The Jamis on the HSA-PTS are generated artificially by lube exposure of the disk surface.

Advantage:

    Root cause analysis of magnetic error symptoms on a spin-stand, which uses original product components (Actuator in this case) under original HDD-conditions. The flexibility of a spin-stand makes these measurements feasible, which cannot be done at a HDD.

    The combination of a magnetic spin-stand with original product components and a laser-doppler-vibrometer measurement is unique. The magnetic error symptom, called 'Jami', could be precisely correlated to an oscillation of the slider in z-direction. Furthermore the total swing could be calculated from the LDV's velocity signal.

The following picture shows the setup on the tester:

    LDV measurements have been done on sliders or suspensions, but could not be directly correlated to the magnetic behavior of the head . This combination of a magnetic spinstand and the LDV gives the possibility to associate magnetic and motion behavior...