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Anomalous Perpendicular Anisotropy in Ultra-Thin Co Films

Published online by Cambridge University Press:  03 September 2012

Michael H. Wiedmann
Affiliation:
Physics Department and Optical Sciences Center, University of Arizona, Tucson, AZ 85721
Brad N. Engel
Affiliation:
Physics Department and Optical Sciences Center, University of Arizona, Tucson, AZ 85721
Robert A. Van Leeuwen
Affiliation:
Physics Department and Optical Sciences Center, University of Arizona, Tucson, AZ 85721
Ko Mibu
Affiliation:
Institute for Chemical Research, Kyoto University, Uji 611, Japan.
Teruya Shinjo
Affiliation:
Institute for Chemical Research, Kyoto University, Uji 611, Japan.
Charles M. Falco
Affiliation:
Physics Department and Optical Sciences Center, University of Arizona, Tucson, AZ 85721
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Abstract

We have used in situ polar Kerr effect measurements to study the magnetic coercivity and anisotropy of MBE-grown Pd (111) /Co/X and Au (111) /Co/X trilayers, where χ is the nonmagnetic noble or transition metal overlayer Ag, Cu or Pd. Polar hysteresis curves were Measured in situ for systematically varied Co and overlayer thicknesses 2 Å ≤ tco ≤ 20 Å and 0 Å ≤ tx ≤ 50 Å. We find the coercivity and total anisotropy display a strongly peaked perpendicular contribution at ∼1 atomic layer (2 Å) non-Magnetic Metal coverage. For Cu, where the effect is strongest, the total anisotropy energy rapidly decreases by a factor of 3 from its peak value after a total coverage of ∼2 atomic layers (4 A) of Cu.

Type
Research Article
Copyright
Copyright © Materials Research Society 1993

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References

1. England, C. D., Engel, B. N., and Falco, C. M., J. Appl. Phys. 69, 5310 (1991).Google Scholar
2. den Broeder, F.J.A., Hoving, W., Bloemen, P.J.H., J. Magn. Magn. Mat. 93, 562 (1991).CrossRefGoogle Scholar
3. Krams, P., Lauks, F., Stamps, R.L., Hillebrands, B., and Güntherodt, G., Phys. Rev. Lett. 69, 3674 (1992).Google Scholar
4. Freeman, A.J. and Wu, R., J. Magn. Magn. Mater. 100, 497 (1991).Google Scholar
5. Hartmann, D., Weber, W. and Güntherodt, G., Ultra Thin Films, Multilayers and Surfaces, edited by den Broeder, F.J.A. (MRS, Pittsburgh, in press). Symposium held 7–10 September 1992. Lyon, France.Google Scholar
6. Ortega, J. E., Himpsel, F. J., Mankey, G. J. and Willis, R. F., Phys. Rev. B 47, 1540 (1993).Google Scholar

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