Temperature-Induced Near-Field Transducer Failure in Heat-Assisted Magnetic Recording

We have studied the reliability of a near-field transducer (NFT) embedded in a magnetic recording slider used for heat-assisted magnetic recording (HAMR) in hard disk drives with a linear velocity of 20 m/s. The NFT head structure and the disk are separated by an air film of 2 nm thickness. In this...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2020-06, Vol.56 (6), p.1-4
Main Authors: Trinh, Tan D., Rajauria, Sukumar, Smith, Robert, Schreck, Erhard, Dai, Qing, Talke, Frank E.
Format: Article
Language:English
Subjects:
Disk drives
Heat-assisted magnetic recording
Heat-assisted magnetic recording (HAMR)
laser optical power
Magnetic heads
Magnetic recording
Magnetic separation
Magnetic signals
Magnetism
Media
near-field transducer (NFT) life-time
signal-to-noise ratio (SNR)
Temperature measurement
Temperature sensors
Thickness
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Summary:We have studied the reliability of a near-field transducer (NFT) embedded in a magnetic recording slider used for heat-assisted magnetic recording (HAMR) in hard disk drives with a linear velocity of 20 m/s. The NFT head structure and the disk are separated by an air film of 2 nm thickness. In this article, the magnetic write width and amplitude of the written magnetic signal on the disk are used as a "health monitor" for the reliability of the NFT under long-term thermal exposure. The results show that the reliability of the NFT head structure sharply decreases with increasing temperature of the NFT but depends only slightly on the media temperature.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2020.2986987