Heat-assisted magnetic recording device capable of detecting degradation of nft by measuring back-heat from medium

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	Heat-assisted magnetic recording device capable of detecting degradation of nft by measuring back-heat from medium
其他题名	Heat-assisted magnetic recording device capable of detecting degradation of nft by measuring back-heat from medium
	MENDONSA, RIYAN; TRANTHAM, JON D.; KIELY, JAMES DILLON; LI, PENG; CHRISTENSEN, JOSHUA WARD
	2018-11-15
专利权人	SEAGATE TECHNOLOGY LLC
公开日期	2018-11-15
授权国家	美国
专利类型	发明申请
摘要	An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.
其他摘要	一种装置包括激光二极管，被配置为在写入操作期间产生光。滑块包括近场换能器（NFT）和光波导。滑块被配置用于热辅助磁记录并且经由波导将光传送到NFT。滑块的写入加热器被配置为在写入操作期间接收电力。热传感器位于滑块的空气支承表面处或附近。热传感器被配置为响应于感测来自介质的反热而产生传感器信号，同时NFT在写入操作期间产生热量。耦合到热传感器的电路被配置为将传感器信号与阈值进行比较，并且响应于传感器信号超过阈值，生成指示NFT性能退化的输出信号。
主权项	A method, comprising: moving a slider configured for heat-assisted magnetic recording relative to and spaced apart from a magnetic recording medium, the slider comprising a writer, a writer heater, a thermal sensor situated at or near an air bearing surface of the slider, and a near-field transducer (NFT); repeatedly measuring, with the slider at a fly height of less than about 10 nm and while the NFT generates heat when writing to the medium, back-heating from the medium using the thermal sensor; comparing back-heating measurements made by the thermal sensor to a threshold; and generating an output signal indicative of NFT performance degradation in response to a back-heating measurement exceeding the threshold.
申请日期	2017-05-15
专利号	US20180330754A1
专利状态	授权
申请号	US15/594812
公开（公告）号	US20180330754A1
IPC 分类号	G11B13/04 \| G11B13/08 \| G11B20/18
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/59148
专题	半导体激光器专利数据库
作者单位	SEAGATE TECHNOLOGY LLC
推荐引用方式 GB/T 7714	MENDONSA, RIYAN,TRANTHAM, JON D.,KIELY, JAMES DILLON,et al. Heat-assisted magnetic recording device capable of detecting degradation of nft by measuring back-heat from medium. US20180330754A1[P]. 2018-11-15.