TY - GEN
T1 - Study of the head disk interface using touchdown sensors and electro-magnetic signals in hard disk drives
AU - Ma, Y.
AU - Xue, S.
AU - Peng, J.
AU - Hellman, D.
AU - Bogy, D. B.
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/7/14
Y1 - 2015/7/14
N2 - The current trend of increasing the areal density in hard disk drives (HDDs) required the fly height of the air bearing slider to decrease from tens of nanometers to only a few nanometers. With the thermal fly-height control (TFC) slider, the fly height can vary from nominal fly height to contact. Controlling the fly height of the slider can also provide insight into the characteristics of the HDI. In drive-level testing, however, the means to evaluate the HDI has been limited to head-media spacing (HMS) signals and servo control signals. With the recently introduced touchdown sensor (TDS, also known as embedded contact sensor), HDI properties can be determined by comparing TDS signal and HMS signal. The TDS has been proven able to identify different HDI characteristics including asperity, pit, lube moguls and surface microwaviness in component level [1]. However, there have been limited reports regarding the relationship between TDS and HMS. In this paper, a correlation between TDS and HMS is established and discussed and the patterns of TDS and HMS are then used to identify different stages of TD.
AB - The current trend of increasing the areal density in hard disk drives (HDDs) required the fly height of the air bearing slider to decrease from tens of nanometers to only a few nanometers. With the thermal fly-height control (TFC) slider, the fly height can vary from nominal fly height to contact. Controlling the fly height of the slider can also provide insight into the characteristics of the HDI. In drive-level testing, however, the means to evaluate the HDI has been limited to head-media spacing (HMS) signals and servo control signals. With the recently introduced touchdown sensor (TDS, also known as embedded contact sensor), HDI properties can be determined by comparing TDS signal and HMS signal. The TDS has been proven able to identify different HDI characteristics including asperity, pit, lube moguls and surface microwaviness in component level [1]. However, there have been limited reports regarding the relationship between TDS and HMS. In this paper, a correlation between TDS and HMS is established and discussed and the patterns of TDS and HMS are then used to identify different stages of TD.
UR - http://www.scopus.com/inward/record.url?scp=84942446901&partnerID=8YFLogxK
U2 - 10.1109/INTMAG.2015.7157669
DO - 10.1109/INTMAG.2015.7157669
M3 - Conference article published in proceeding or book
AN - SCOPUS:84942446901
T3 - 2015 IEEE International Magnetics Conference, INTERMAG 2015
BT - 2015 IEEE International Magnetics Conference, INTERMAG 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2015 IEEE International Magnetics Conference, INTERMAG 2015
Y2 - 11 May 2015 through 15 May 2015
ER -