Magnetoresistance and Hall effect in epitaxial Co-Au superlattices

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Abstract
Resistivity, magnetoresistance, and the Hall effect have been measured in two epitaxially ordered Co-Au superlattices at temperatures between 2 and 295 K. One sample is composed of 60 bilayers of Co 5 Å Au 16 Å and has a magnetic easy axis perpendicular to the film plane, while the other contains 30 bilayers of Co (30 Å)/Au(16 Å) and has an easy axis parallel to the film plane. The magnetoresistance effect of the first sample (∼15%) is an order of magnitude larger than in the second sample. In addition, the Co(5 Å)/Au(16 Å) sample exhibits a large Hall voltage in zero applied magnetic field.