Non-integer spin-polarized conductance in multichannel magnetic point contacts

V. Fallahi | Akbar Nazari-Golshan

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=116854
Date :  2019/09/18
Publish in :    The European Physical Journal B


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Abstract :

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The ballistic conductance of a geometrically con_ned head-to-head 180_ domain wall at a magnetic point contact in a two-dimensional (2D) metallic nanowire is studied theoretically. The ballistic conductance is computed by introducing the modi_ed Landauer-Buttiker formalism in which the spin polarization e_ects are included. The analysis is based on coherent scattering of the carriers by the spindependent potential associated with the wall structure. The transmission properties of coherent states are obtained by introducing an algorithm to solve the coupled spin channels Schrodinger equation with mixed Dirichlet-Neumann boundary conditions applied far from the domain wall. Non-integer values for the conductance have been observed, due to the modi_ed chemical potentials at the ferromagnetic contact probes. It has been shown that the dips in conductance arise when the electrons are partially polarized in the ferromagnetic leads, due to the formation of spin-dependent chemical potential.