Abstract

Electronic and spin states of the codeposited C 60–Co films with large tunnel magnetoresistance (TMR) effect were investigated with the X-ray absorption and magnetic circular dichroism (MCD) spectroscopies. It is revealed that a C 60–Co compound generated in the C 60–Co films shows the clear MCD signal attributed to the spin-polarized Co 3d states hybridized with C 60 π orbitals. The magnetic response of these Co 3d-derived states agrees well with temperature dependence of the observed MR ratios of the granular C 60–Co films. This suggests the incorporation of the spin-polarized Co 3d-derived states of the C 60–Co compound into the observed TMR effect.

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