(100) Epitaxial and (111) Polycrystalline Spin Valve Heterostructures on si (100): Magnetotransport and the Importance o

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Hyun S. Joo, Imran Hashim,t and Harry A. Atwater Thomas J. Watson Laboratory of Applied Physics California Institute of Technology, Pasadena, CA 91125

ABSTRACT We have investigated magnetoresistance properties of (100) epitaxial, (11) textured and polycrystalline spin valve heterostructures of the form NisoFez/Cu/NigoFe 2 2o/FesoMn 5o on (100) Si substrates by ultra high vacuum (UHV) ion beam sputtering at room temperature. Magnetoresistance was measured as a function of Cu interlayer thickness (ti) with 10 A _