Abstract
The performance of magnetic devices correlates with the spatial distribution and time evolution of the magnetization. In recording heads for example, the magnetization components Mx(t), My(t), and Mz(t) are very sensitive to the device boundaries, defects, issues of design and processing, and an applied or internal magnetic field or magnetomotive force. With the increasing difficulty of reliably modeling complex magnetic devices ever decreasing in size, efficient experimental Kerr-effect contrast imaging of M-components becomes more important as aid to progress in fundamental understanding, diagnostics and development. This paper discloses innovations which enable imaging of pure in-plane magnetization sensitive Kerr components devoid of polar Kerr and background signals. For the component sensitive to perpendicular magnetization, a means for calibrating pure polar Kerr contrast relative to the pure in- plane contrast is described. These methods operate without the reliance on changing magnetic state for background subtraction as in earlier methods. They are therefore applicable to imaging the three M-components at different stages of magnetization in recording heads, and in magnetically ‘hard’ materials, for example amorphous magnets and media for perpendicular magnetic recording.
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References
Hubert, A. and Schaefer, R., 1998, Magnetic Domains, Springer, Berlin (Chapter 2).
Re, M. and Kryder, M. i., 1984, J. Appl. Phys., vol. 55, 2245; Kasiraj, P., Horn, D.E. and Best, J.S., 1987, IEEE Trans. Magn. vol. MAG-23, 2161; Heyes, N.A.E., Wright, C.D. and Clegg, W.W., 1991, “Observation of magneto-optic phase contrast using a scanning laser microscope”, J. Apl. Phys., col 68, 5322-5324.
Frosch, A. and Schneider, J., 1980, IBM Tech. Disci. Bulletin, vol. 22, 3260; Argyle, B.E. and Suits, F., 1985, “Laser magneto-optic microscope for studying domain motions in thin film heads (Invited)”,Digest of 1985 INTERMAG Conf.; Schmidt, W., Rave, W. and Hubert, A. 1985, “Enhancement of magneto-optic domain observation by digital image processing”, IEEE Trans, vol. MAG-21, 1596-1598.
Inoue, S. and Spring, K.R., 1998, Video Microscopy, 2nd Edition, Plenum Press, New York.
Argyle, B.E. and McCord, J.G., 2000, “New laser illumination method for Kerr microscopy”, Jl. Appl. Phys., vol. 87, 6487–6489.
Wright, CD., Nutter, P.W., and Filbrandt, P.W.M., 1996, “A theoretical model of magneto-optic scanning laser microscopy”, IEEE Trans, on Magnetics, vol 32, 3154–64.
Yang, Z.J. and Sheinfein, M.R., 1993, “Combined three-axis surface magneto-optical Kerr effects in the study of surface and ultrathin-film magnetism“, J. Appl, Phys. vol. 74, 6810–23.
Petek, B., Trouilloud, P. and Argyle, B. “Time resolved domain dynamics in thin film heads”, 1990, IEEE Trans. Magn., vol. 26, 1328–30.
Freeman, M.R. and Smyth, J.F., 1996, “Picosecond time-resolved magnetization dynamics of thin-film heads”, J. Appl. Phys., vol 79, 5898–900.
Hartshorn, N. and Stewart, A., 1969, Practical Optical Crystallography, American Elsevier, New York.
Argyle, B., 1990, “A magneto-optic microscope system for magnetic domain studies”, Elect. Chem. Soc. Proc. of Symposium on Magnetic Materials, Processes, and Devices, 85–109.
Pluta, M. Advanced Light Microscopy, 1993, Polish Scientific Publishers, Warsaw.
Argyle, B.E., Petek, B. and Herman, Jr. D.A., 1987, “Optical imaging of domains in motion (invited)”, J. Appl. PHys. vol. 61, 4303–06.
Argyle, B. Petek, B. Re, ME., Suits, S. and Herman, D.A., 1988, “Bloch line influence on wall motion response in thin-film heads”, J. Appl. Phys. vol. 64, 6595–97; Argyle, B.E. and Kryder, M.E., 1982, “Dynamic properties of charged walls in ion implanted garnets”, J. Appl. Phys.,vol.53, 1664-1670; Trouilloud, P.L., Argyle, B.E., Petek, B. and Herman, Jr., D.A., 1989, “Domain conversion under high frequency excitation in inductive thin film heads. IEEE Trans. Mag. vol. 25, 3461-63.
Fowler, CA., and Fryer, E.M. 1954, “Magnetic domains by the longitudinal Kerr effect”, Phys. Rev. vol. 94, 52.
Bennett, H.E. and Bennett, J.M., 1978, “Polarization”, in W.G. Driscoll and W. Vaughan, (eds.) Handbook of Optics, 1st ed. McGraw-Hill, New York, pp.10-1-10-164.
Trouilloud, P.L., Petek, B. and Argyle, B.E., 1994, “Methods for wide-field imaging of small magnetic devices”, IEEE Trans, on Magnetics, vol. 30, 4494–96.
A question could be raised about the possible influence of the Faraday effect on a lens forming an image. Note however, that the diamagnetic Faraday effect is due to minute differences in the indices of refraction for right-and left-hand circularly polarized light, whereas the refraction responsible for imaging involves large discontinuous changes in ordinary index of refraction at lens surfaces. The discontinuity does cause some changes in polarization of linear polarized light, but only for rays outside the extinction cross, a region we carefully avoid.
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Argyle, B.E., Mccord, J.G. (2001). Efficient Kerr Microscopy. In: Hadjipanayis, G.C. (eds) Magnetic Storage Systems Beyond 2000. NATO Science Series, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0624-8_22
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DOI: https://doi.org/10.1007/978-94-010-0624-8_22
Publisher Name: Springer, Dordrecht
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