Magnetic Ultrathin Films: Multilayers and Surfaces, Interfaces and Characterization
MATERIALS RESEARCH SOCIETY PITTSBURGH PA
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We have observed oscillations with non-magnetic spacer layer thickness in the saturation fields and characteristic exchange fields of CoCu multilayers grown by MBE. The specimens consisted of a set of samples in which the thickness of copper layers took a series of values between 5Angstrom and 20Angstrom, while the cobalt layer thickness was set at 15Angstrom throughout. The multilayers were grown epitaxially on GaAs 110 with Ge. Co 110 and Au in the buffer region, resulting in CoCu bilayers in the 111 orientation. Although oscillations were observed in these magnetic measurements, no oscillations were observed in the magnetoresistance itself. These observation are somewhat at odds with similar measurements made on samples prepared by sputtering. We conclude with a discussion involving exchange coupling, in-plane anisotropy and defects it the magnetic structure in an attempt to account for these conflicting results.
- Electricity and Magnetism