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Novel Ultra-Sensitive Air Bearing Excitation Based Resonance Contact Detection in Heat Assisted Magnetic Recording (HAMR)

[+] Author Affiliations
Sukumar Rajauria, Erhard Schreck, Robert Smith

Western Digital Company, San Jose, CA

Paper No. ISPS2017-5443, pp. V001T01A010; 3 pages
doi:10.1115/ISPS2017-5443
From:
  • ASME 2017 Conference on Information Storage and Processing Systems collocated with the ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems
  • ASME 2017 Conference on Information Storage and Processing Systems
  • San Francisco, California, USA, August 29–30, 2017
  • Conference Sponsors: Information Storage and Processing Systems Division
  • ISBN: 978-0-7918-5810-3
  • Copyright © 2017 by ASME

abstract

Resonance based enhanced contact detection is investigated at high sliding head-disk interface of hard disk drives. Acoustic signal arising from the contact in between the head and the disk is dominated by the resonance of the head air bearing frequencies. We show that modulation the head at resonance during the contact enhances greatly the acoustic signal generated during the contact between the head and the disk. As an application for HAMR HDDs, we used this scheme to detect the contact in between the near field transducer (NFT) and the disk which so far has been elusive.

Copyright © 2017 by ASME

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