Nondestructive evaluation of magnetic disk heads is achieved using a photoacoustic microscope (PAM). A qualitative evaluation for gap or an isolation area of the heads is performed with photoacoustic amplitude and phase images. Resolution achieved is about 2 micrometer. A crack in a ferrite region and a bubble in a glass filler is observed with the PAM.
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Tsutomu Hoshimiya (1997) studied this question.
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