Abstract
Using a Q-switched Nd:YAG laser, we have successfully obtained laser-induced ripple patterns on various ferric metal surfaces. Changes of magnetic properties associated with the rippled areas were then investigated using a simple magnetic detecting system, which consisted of an audio recorder head, an audio amplifier and an oscilloscope. Significant magnetic changes associated with the formation of the ripples were found on a steel substrate pre-coated with a layer of chromium. This technique can be used as the basis of a machine readable laser marking system on steel surfaces, or even other surfaces that could be cotated with a steel/chromium film.
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References
M. Carbucicchio: Thin Solid Films 126, 293 (1985)
J.R. Koelsch: Prod. Eng. 32, 18 (1985)
W.M. Steen, J. Powell: Mater. Eng. 2, 157 (1981)
C.W. Draper, J.M. Poate: Int. Metal Rev. 30, 85 (1985)
J.F. Young, J.S. Preston, H.M. van Driel, J.E. Sipe: Phys. Rev. B 27, 1155 (1983)
S.C. Hsu, S. Chakrovorty, R. Mehrabian: Metal Trans, 9 B, 221 (1978)
R.C. Dye, R.E. Muenchausen, N.S. Nogar, A. Mukherjee, S.R.J. Bruck: Appl. Phys. Lett. 57, 1149 (1990)