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Magnetism of Cobalt Base Artificial Lattice Films

Published online by Cambridge University Press:  21 March 2011

Masataka Masuda ,
Shun Matsumoto ,
Kunihiko Taka ,
Naoki Yoshitake  and
Yasunori Hayashi
Masataka Masuda
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, JAPAN
Shun Matsumoto
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, JAPAN
Kunihiko Taka
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, JAPAN
Naoki Yoshitake
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, JAPAN
Yasunori Hayashi
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, JAPAN
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Abstract

The Co/Pd and Co/Pd artificial lattice films have attracted much interest by their special magnetization properties. We discussed the effect of the Pt, Pd layer thickness on the magnetic anisotropy, and we showed the effect of the hydrogen ion implantation on the magnetic properties of multi-layered films. The Co/Pt and Co/Pd multi-layered films were formed on Si(111) substrates with molecular beam epitaxy. We did structure analysis, magnetic domain analysis and magnetic properties evaluation with XRD, MFM and VSM, respectively. Among the series of films of 0.4nm Co layer, XRD showed that the film of 1.0nm Pt layer had a highest periodicity and that they had (111) plane orientation completely. The magnetic domain size reduced with the increase of the thickness of Pt layer. We found out that the coercivity decreased linearly as a function of the length of magnetic domain wall in the unit area. The result of VSM showed that the multi-layered films of Pt thickness of less than 2.8nm had perpendicular magnetic anisotropy. The perpendicular anisotropy energy changed by the nonmagnetic layer thickness and had a maximum value for 0.4nm Co 0.4nm/ nonmagnetic metal 1.0nm multi-layered film. After hydrogen implantation into the films, XRD showed that the lattice spacing was swelled with hydrogen dose. Also, MFM observed that the magnetic domain size reduced with the increase of the hydrogen dose. The easy axis of magnetization changed from perpendicular to parallel in the plane with the increase of the hydrogen dose. After evacuation of hydrogen at 473K, perpendicular anisotropy was partially recovered. This phenomenon suggested that the origin of magnetic anisotropy was mainly the lattice mismatch and distortion in the layer interface. But Co/Pd film was not recovered by this thermal treatment. This means that Pd made stable hydride and did not evacuate hydrogen at this temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , T1.3
Copyright
Copyright © Materials Research Society 2001

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References

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