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The Scientific World Journal
Volume 2014, Article ID 326427, 6 pages
Research Article

Mechanistic Features of Nanodiamonds in the Lapping of Magnetic Heads

1School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China
2National Center for Nanoscience & Technology of China, Beijing 100190, China
3Department of Emergency, Jinling Hospital Medical School of Nanjing University, Nanjing 210000, China

Received 27 February 2014; Revised 9 May 2014; Accepted 19 May 2014; Published 22 June 2014

Academic Editor: Erjia Liu

Copyright © 2014 Xionghua Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Nanodiamonds, which are the main components of slurry in the precision lapping process of magnetic heads, play an important role in surface quality. This paper studies the mechanistic features of nanodiamond embedment into a Sn plate in the lapping process. This is the first study to develop mathematical models for nanodiamond embedment. Such models can predict the optimum parameters for particle embedment. From the modeling calculations, the embedded pressure satisfies and the indentation depth satisfies . Calculation results reveal that the largest embedded pressure is 731.48 GPa and the critical indentation depth is 7 nm. Atomic force microscopy (AFM), scanning electron microscopy (SEM), and Auger electron spectroscopy (AES) were used to carry out surface quality detection and analysis of the disk head. Both the formation of black spots on the surface and the removal rate have an important correlation with the size of nanodiamonds. The results demonstrate that an improved removal rate (21 nm·min−1) can be obtained with 100 nm diamonds embedded in the plate.