Giant anisotropic magneto-resistance in ferromagnetic atomic contacts
نویسندگان
چکیده
منابع مشابه
Theory of anisotropic magnetoresistance in atomic-sized ferromagnetic metal contacts
M. Häfner,1,2 J. K. Viljas,1,3 and J. C. Cuevas2 1Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures, Universität Karlsruhe, D-76128 Karlsruhe, Germany 2Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain 3Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 5100, FIN-02015 TKK, Fi...
متن کاملSupplementary material for “ Anisotropic magnetoresistance in ferromagnetic atomic - sized metal contacts ”
The elements h iα,iα;σ are the spin-dependent on-site energies, h (0) iα,jβ;σ for i 6= j are the hopping elements, while h (0) iα,iβ;σ = 0 for α 6= β. For a nonorthogonal basis |iασ〉 we additionally need the spin-independent overlap integrals between different orbitals: Siασ,jβσ′ = 〈iασ|jβσ′〉 = siα,jβδσσ′ . The creation and annihilation operators then satisfy {ĉiασ, ĉjβσ′} = [s−1]iα,jβδσσ′ . In...
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– We study here, both experimentally and theoretically, the anisotropy of magnetoresistance in atomic contacts. Our measurements on iron break junctions reveal an abrupt and hysteretic switch between two conductance levels when a large applied field is continuously rotated. We show that this behaviour stems from the coexistence of two metastable electronic states which result from the anisotrop...
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M. Häfner,1,2 J. K. Viljas,1,3 D. Frustaglia,4 F. Pauly,1,3 M. Dreher,5 P. Nielaba,5 and J. C. Cuevas2,1,3 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany 2Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain 3Institut für Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germ...
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Abstract : The variation of the electrical resistivity of a material in the externalmagnetic field is known as magneto resistance. This phenomenon has been attractedboth theoretical and experimental researchers in miniaturization of magneto meters inthe recent years. In this paper, the magneto resistance of an inhomogeneous twodimensional conductor with ladder geometry i...
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ژورنال
عنوان ژورنال: The European Physical Journal B
سال: 2006
ISSN: 1434-6028,1434-6036
DOI: 10.1140/epjb/e2006-00201-3