Europhys. Lett.
Volume 74, Number 2, April 2006
Page(s) 320 - 326
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 17 March 2006
Europhys. Lett., 74 (2), pp. 320-326 (2006)
DOI: 10.1209/epl/i2006-10006-0

Controlling spin in an electronic interferometer with spin-active interfaces

A. Cottet, T. Kontos, W. Belzig, C. Schönenberger and C. Bruder

Department of Physics and Astronomy, University of Basel Klingelbergstrasse 82, CH-4056 Basel, Switzerland

received 12 January 2006; accepted 22 February 2006
published online 17 March 2006

We consider electronic current transport through a ballistic one-dimensional quantum wire connected to two ferromagnetic leads. We study the effects of the spin-dependence of interfacial phase shifts (SDIPS) acquired by electrons upon scattering at the boundaries of the wire. The SDIPS produces a spin-splitting of the wire resonant energies which is tunable with the gate voltage and the angle between the ferromagnetic polarizations. This property could be used for manipulating spins. In particular, it leads to a giant magnetoresistance effect with a sign tunable with the gate voltage and the magnetic field applied to the wire.

73.23.-b - Electronic transport in mesoscopic systems.
75.75.+a - Magnetic properties of nanostructures.
85.75.-d - Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields.

© EDP Sciences 2006