title: Electric field control of magnetoresistance in InP nanowires with ferromagnetic contacts.
abstract: We demonstrate electric field control of sign and magnitude of the magnetoresistance in InP nanowires with ferromagnetic contacts. The sign change in the magnetoresistance is directly correlated with a sign change in the transconductance. Additionally, the magnetoresistance is shown to persist at such a high bias that Coulomb blockade has been lifted. We also observe the magnetoresistance when one of the ferromagnets is replaced by a nonmagnetic metal. We conclude that it must be induced by a single ferromagnetic contact, and that spin transport can be ruled out as the origin. Our results emphasize the importance of a systematic investigation of spin-valve devices in order to discriminate between ambiguous interpretations.
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands.
authors.forename: F A
authors.initials: FA
authors.lastname: Zwanenburg
authors.forename: D W
authors.initials: DW
authors.lastname: van der Mast
authors.forename: H B
authors.initials: HB
authors.lastname: Heersche
authors.forename: L P
authors.initials: LP
authors.lastname: Kouwenhoven
authors.forename: E P A M
authors.initials: EP
authors.lastname: Bakkers
mesh_terms: D004553:Electric Conductivity; D017097:Electric Impedance; D005290:Ferric Compounds / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D059346:Magnets; D053770:Nanowires / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D007204:Indium; C001215:ferrite