Slider dynamics during continuous contact with textured and smooth disks in ultra low flying height

被引:35
作者
Tanaka, H [1 ]
Yonemura, S
Tokisue, H
机构
[1] Hitachi Ltd, Data Storage & Retrieval Syst Div, Odawara, Kanagawa 2568510, Japan
[2] Hitachi Ltd, Mech Engn Res Lab, Tsuchiura, Ibaraki 3000013, Japan
关键词
head-medium interface; proximity recording; thermal asperity; thin-film media; vibration measurement;
D O I
10.1109/20.917640
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Dynamics of a nano-slider during continuous contact with textured and smooth disks are studied using laser Doppler vibrometer, friction sensor, acoustic emission (AE) transducer and read back signal from a magneto-resistive head on the slider. The flying height of the slider is controlled from flying to contact at the same velocity by changing the environmental pressure. When the slider flies over the textured disk, contact occurs at flying height of 14 nm, and friction and AE signal increase gradually with decreasing flying height. The increase in the amplitude of the slider vibration is within a few nanometers from flying to contact. When the slider flies over the smooth disk, contact occurs at much lower flying height of 6 nm, However, friction, AE signal and the amplitude of the vibration show a steep increase upon contact. Both pitch and roll vibration modes of the slider air bearing are strongly excited with the amplitude of about 10 nm, The pitch vibration results in the slider impacting the disk surface severely. As the result. the disk vibrates at the same frequency. In addition, thermal asperities with extraordinary high amplitude are observed associated with the impacts induced by the pitch vibration.
引用
收藏
页码:906 / 911
页数:6
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