Abstract
80NiFe/LB-film/Co tunnel junctions with poly-N-dodecyl-acrylamide and its copolymer with the ferrocene derivative (Fc) or the tris(bipyridine)ruthenium complex (Ru) have been fabricated. FTIR spectra and small angle X-ray diffraction patterns for Fc, Ru and their mixture LB films indicated the formation of highly ordered molecular structure. The Bohr magneton number per one ferrocene moiety showed no difference between the film of Fc and the mixed film with Ru in the dark. However, UV-visible absorption and fluorescence spectra indicated that the electron transfer process in the mixed LB films occurred by an irradiation of light. The tunnel junctions using these LB films showed tunnel magnetoresistive effect. Its magnetoresistive ratio was 0.4% at room temperature being very small in comparison with the tunnel junction with Al2O3 tunnel barrier. The reason for this was considered to be residual water in the LB film causing a structural change of Co or the oxidation of the Co surface, so that the spin polarization could have become low.
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