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Abstract
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.
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