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Thin Film Materials with Enhanced Magneto-Optical Effects

Published online by Cambridge University Press:  21 February 2011

D. Weller  and
W. Reim
D. Weller
Affiliation:
SIEMENS AG, Central Research and Development, ZFE F1 TPH 11 P.O. Box 3220, 8520 Erlangen, F.R. Germany.
W. Reim
Affiliation:
SIEMENS AG, Central Research and Development, ZFE F1 TPH 11 P.O. Box 3220, 8520 Erlangen, F.R. Germany.
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Abstract

Ultra high vacuum deposited rare-earth transition metal thin film materials have been systematically investigated with respect to a high read out performance ∝ R1/2 ·θK in a magneto-optical differential detection scheme (R: reflectivity, θK: Kerr-rotation). In-situ determined XPS valence band spectra have been correlated to magneto-optical and reflectivity spectra ex-situ measured in the photon energy range 0.5 ≤ Eph ≤ 5.5 eV. At temperatures above 100 K, contributions to the Kerr effect from 4fn → 4fn−15d1 optical transitions amount to some tenth of a degree at maximum. In particular, Eu is found to be divalent in amorphous Eu-FeCo intermetallic alloys but no contribution to the Kerr-effect could be detected both at room temperature and at 100 K. We present a general argument that 4f excitations of RE ions in an RE-TM alloy can never be expected to contribute more than several tenth of a degree to θK.

A substantial improvement of the performance can be expected, however, if the optical constants n and k of a storage material with a given magneto-optical activity are lowered. A novel approach in this direction is the use of artificially layered structures where a maximum enhancement of R1/2 ·θK of about a factor of 2.5 may be expected.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 150: Symposium F – Materials for Magneto-Optic Data Storage , 1989 , 33
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

1. Optical Memory News, 59 (1988) 7; Optical Memory News 65 (1988) 28Google Scholar
2. Gambino, R.J. and McGuire, T.R., J. Magn. Magn. Mat. 54–57 (1986) 1365 Google Scholar
3. Reim, W., Gambino, R.J., Ruf, R.R. and Plaskett, T.S., J. Appl. Phys. 61 (1988) 3349 Google Scholar
4. Choe, Y.J., Tsunashima, S., Katayama, T., Uchiyama, S., Proc. Intern. Symp. Magneto-Optics, J. Magn. Soc. Jpn. 12, Suppl. S1, (1988) 221 Google Scholar
5. Suzuki, T. and Katayama, T., IEEE Trans. Magn. MAG–22 (1987) 1231 Google Scholar
6. Weller, D., Reim, W. and Schrijner, P., IEEE Trans. Mag. MAG–24 (1988) 2554 Google Scholar
7. Reim, W. and Schoenes, J., in “Handbook of Ferromagnetic Materials”, vol. V, Wohlfarth, E.P. and Buschow, K.H.J., Eds., North Holland, Amsterdam, 1989 Google Scholar
8. Reim, W., Schoenes, J., Hulliger, F. and Vogt, O., J. Magn. Magn. Mat. 54–57 (1986) 1401 Google Scholar
9. Weller, D., Schrijner, P. and Reim, W., IEEE Trans. Mag. MAG–24 (1988) 1731 Google Scholar
10. Weller, D. and Reim, W., Siemens Forsch.- u. EntwickL.-Ber. 17 (1988) 112 Google Scholar
11. Rupp, G. and Ballenberger, G., IEEE Trans. Mag. MAG–23 (1987) 134 Google Scholar
12. Reim, W., J. Mag. Magn. Mat. 58 (1986) 1 Google Scholar
13. Weller, D. and Reim, W., Proc. 7th Intern. Conf. on Solid Surfaces, Köln, 1989 Google Scholar
14. Hüsser, O.E., ETH Zürich, unpublished (1983)Google Scholar
15. Wachter, P., CRC Critical Reviews in Solid State Sciences 3 (1972) 189 Google Scholar
16. Schoenes, J., Z. Phys. B20 (1975) 345 Google Scholar
17. see e.g. Hillebrecht, F.U. and Campagna, M. in Handbook on the Physics and Chemistry of Rare Earths, Vol 10, eds. Gschneidner, K.A. Jr., Eyring, L. and Hüfner, S., Elsevier Science Publishers B.V., 1987 Google Scholar
18. Buschow, K.H.J., Campagna, M. and Wertheim, G.K., Sol. St. Comm., 24 (1977) 253 Google Scholar
19. Weller, D., Reim, W., Ebert, H., Johnson, D. D. and Pinski, F.J., Proc. ICM '88, Paris; J. Physique C8 (1988) 41 Google Scholar
20. Rhyne, J.J., Pickart, S.J. and Alperin, H.A., in “Magnetism and Magnetic Materials – 1973”, Graham, C.D. and Rhyne, J.J., Eds., AIP Conf. Proc. No. 18, p.563, Amer. Inst. Phys., New York, 1974 Google Scholar
21. Tao, L.J., Gambino, R.J., Kirkpatrick, S., Cuomo, J.J. and Lilienthal, H., in “Magnetism and Magnetic Materials – 1973”, Graham, C.D. and Rhyne, J.J., Eds., AIP Conf. Proc. No. 18, p.641, Amer. Inst. Phys., New York, 1974 Google Scholar
22. Schoenes, J., Reim, W., Studer, W. and Kaldis, E., Proc. ICM '88, Paris; J. Physique C9 (1988) 333 Google Scholar
23. Katayama, T., Suzuki, Y., Awano, H., Nishihara, Y. and Noshizuka, N., Phys. Rev. Lett. 60 (1988) 1426 Google Scholar
25. Reim, W. and Weller, D., Appl. Phys. Lett. 53 (1988) 2453 Google Scholar
24. Katayama, T., Sugimoto, T., Suzuki, Y., Kitaguchi, T., Nishihara, Y. and Koshizuka, N., Proc. ICM '88, Paris; J. Physique C8 (1988) 1791 Google Scholar
26. Reim, W. and Weller, D., Proc. INTERMAG '89, WashingtonGoogle Scholar
27. Balasubramanian, K. and Macleod, H.A., Proc. SPIE OE/LASE Topical Meeting on Optical Data Storage, Los Angeles, 1989 Google Scholar