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For spin-polarized junctions of ferromagnetically contacting multipleconductive paths, such as ferromagnet (FM)/atomic wires/FM and FM/carbonnanotubes/FM junctions, we theoretically investigate spin-dependent transportto elucidate the intrinsic relation between the number of paths and conduction,and to enhance the magnetoresistance (MR) ratio. When many paths are randomlylocated between the two FMs, electronic wave interference between the FMsappears, and then the MR ratio increases with increasing number of paths.Furthermore, at each number of paths, the MR ratio for carbon nanotubes becomeslarger than that for atomic wires, reflecting the characteristic shape ofpoints in contact with the FM.Comment: 7 pages, 3 figures, accepted for publication in Phys. Rev.

physical review. b, condensed matter and materials physics

Magnetoresistance effect in spin-polarized junctions of ferromagnetically contacting multiple conductive paths: Applications to atomic wires and carbon nanotubes