Abstract
MeV ion and Ar-ion laser beams were impinged onto 304 stainless steel foils to investigate the localized modification of the magnetic property associated with the phase transformation. The intensity of the magnetization was found to increase by MeV Au+ implantation because of the localized martensitic transformation, whereas that of the Ar-ion laser-irradiated areas was found to locally decrease at a laser power of 350 mW and almost extinguish at 550 mW with a beam spot size of 13.2 µm (at 1/e intensity) because of the localized retransformation into austenite. These results indicate that the beam-induced localized phase transformation in stainless steel can be applied to permanent magnetic recording.
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