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Magnetic Anisotropy in Electrodeposited CO Films and spin-valves on Gaas Substrates

  • K. Attenborough (a1), M. Cerisier (a1), H. Boeve (a2), J. De Boeck (a2), G. Borghs (a2) and J.-P. Celis (a1)...

Abstract

We have studied the magnetic and structural properties of thin electrodeposited Co and Cu layers grown directly onto (100) n-GaAs and have investigated the influence of a buffer layer. A dominant fourfold anisotropy with a uniaxial contribution is observed in 10 nm Co electrodeposited films on GaAs. An easy axis is observed in the [001] GaAs direction with two hard axes of differing coercivities parallel to the [011] and [011] directions. For thicker films the easy axes in the [001] direction becomes less pronounced and the fourfold anisotropy becomes less dominant. Co films of similar thicknesses deposited onto an electrodeposited Cu buffer layer were nearly isotropic. From X-ray diffraction 21 nm Co layers on GaAs were found to be hcp with the c-axis tending to be in the plane of the film. The anisotropy is ascribed to the Co/GaAs interface and is held responsible for the unique spin-valve properties seen recently in electrodeposited Co/Cu films.

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2. Attenborough, K., Boeve, H., De Boeck, J., Borghs, G. and Celis, J.-P., Sensors and Actuators A, 1999, in press.
1. Attenborough, K., Boeve, H., De Boeck, J., Borghs, G. and Celis, J.-P., Appl. Phys. Lett. 74, 12 April (1999).
4. Attenborough, K., De Boeck, J., Celis, J.-P., Mizuguchi, M. and Akinaga, H., “Enhanced magnetic properties in electrodeposited nickel films”, IEEE Trans Magn, To be published, September 1999
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8. Recent NMR measurements of these Co films have brought to light that the films consist of a mixed fcc and hcp phase. The bcc phase was not observed. This result will be reported in more detail elsewhere.

Magnetic Anisotropy in Electrodeposited CO Films and spin-valves on Gaas Substrates

  • K. Attenborough (a1), M. Cerisier (a1), H. Boeve (a2), J. De Boeck (a2), G. Borghs (a2) and J.-P. Celis (a1)...

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