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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Zhi-Min Yuan Bo Liu Chun Lian Ong Siang Huei Leong Shiming Ang |
| Copyright Year | 1965 |
| Abstract | In the hard disk drive (HDD), the Wallace based in-situ flying height (FH) test is widely used for FH measurement since the application of thermal FH control (TFC). The Wallace equation shows the spacing loss of signal amplitude at a particular frequency or wavelength. It has a very simple expression for longitudinal recording and becomes more complex in perpendicular recording with soft magnetic underlayer. In the FH measurement, the signal amplitude at testing frequency has to be in good quality in order to achieve high precision FH measurement. In this work, an integration of power spectral density-based version of the Wallace spacing loss equation is developed. The use of the latter equation enables in-situ FH measurement via the monitoring of relaxed quality (multitone) readback signals over a band of frequency. The new method is able to test the FH change at high precision on AC erased track. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 4452 |
| Ending Page | 4454 |
| Page Count | 3 |
| File Size | 777647 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 48 |
| Issue Number | 11 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2012-11-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Heating Frequency measurement Magnetic heads Equations Testing Magnetic recording Wavelength measurement Wallace equation Flying height (FH) in-situ FH test thermal FH control (TFC) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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