Sensors and Materials
ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Cloud-based Optical Characterization of Hard Disk Drive Recording Heads

Weerayuth Khunrattanasiri, Anchyza Yokpradit, Teerawat Tongloy, and Siridech Boonsang

(Received December 18, 2017; Accepted June 5, 2018)

Keywords: micro-ellipsometry, complex refractive index, private cloud, MQTT, flying height

In the hard disk drive (HDD) industry, the measurement of flying height is a crucial process for verification of the design of the recording head air-bearing. The flying performance of recording heads has to be measured and compared with the original design to assure the reliability of HDDs. Optical interferometry is normally used to measure the flying height of recording heads. The key parameter for setting up the measurement is the refractive index, which normally the values of deviate depending on machine conditions during the manufacturing processes. The variation in refractive index values cannot be identified during flying height measurement because these is no on-line technique for doing so. In this paper, we present a novel technique using in-house designed micro-ellipsometry to measure the complex refractive index combined with data transfer to a private cloud network via the internet of things message queuing telemetry transport (IoT MQTT) protocol. Therefore, the measurement of the complex refractive index can be carried out for each recording head and we can improve the precision of the flying height measurement. In addition, the information about refractive index not only can be shared with flying height tester to correct the variation in each recording head but also can be used to assist air-bearing designers in the instantaneous validation of their design.

Corresponding author: Siridech Boonsang




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