DocumentCode :
1483182
Title :
Photoacoustic detection of microcracks of thin film head alumina using Nd:YAG laser irradiation
Author :
Chekanov, A. ; Hong, M.H. ; Low, T.S. ; Lu, Y.F.
Author_Institution :
Data Storage Inst., Nat. Univ. of Singapore, Singapore
Volume :
33
Issue :
5
fYear :
1997
fDate :
9/1/1997 12:00:00 AM
Firstpage :
2863
Lastpage :
2865
Abstract :
Acoustic wave generation during Nd:YAG laser irradiation on thin film head alumina is studied. It is found that with proper selection of laser parameters, the acoustic waveforms observed are completely different for pristine head and head with preexisting microcracks. It has potential applications of thin-film heads and head wafers
Keywords :
alumina; crack detection; magnetic heads; magnetic thin film devices; microcracks; photoacoustic effect; Al2O3; Nd:YAG laser irradiation; acoustic wave generation; alumina; microcracks; photoacoustic detection; thin film head; Acoustic beams; Acoustic signal detection; Acoustic testing; Acoustic waves; Laser beams; Lenses; Magnetic heads; Microphones; Nondestructive testing; Transistors;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.617780
Filename :
617780
Link To Document :
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