Dynamics of glide head in the proximity contact regime

Author

Yao, Wei ; Kuo, David ; Sundaram, Ramesh

Author_Institution

Seagate Technol., Fremont, CA, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2469

Lastpage

2471

Abstract

The intrinsic glide capability of a magnetic disk is typically assessed by the glide avalanche test with an acoustic emission (AE) or a piezoelectric transducer (PZT) sensor and is found to be a function of asperity height distribution. In this work, the dynamics of a glide head in the near contact regime is investigated. Both the laser Doppler vibrometer (LDV) and PZT techniques are used to monitor the head dynamics during the touchdown process on disks with different roughness. It is shown that the glide avalanche readings can be affected by the collapse of the air bearing. The comparison of the PZT and LDV responses during the glide avalanche process indicates a general agreement between these two methods

Keywords

hard discs; magnetic heads; measurement by laser beam; piezoelectric transducers; surface topography; vibration measurement; PZT sensor techniques; air bearing; asperity height distribution; disk roughness; glide head; head dynamics; laser Doppler vibrometer; magnetic disk; near contact regime; proximity contact regime; touchdown process; Acoustic testing; Disk recording; Magnetic heads; Magnetic recording; Magnetic sensors; Monitoring; Signal analysis; Spectrogram; Surface topography; Vibrometers;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800861

Filename

800861