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The effect of magnetic field on a nonballistic spin field effect transistor

S Caliskan and M Kumru

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A spin field effect transistor (FET) made of a nonballistic quantum wire with a single transport channel is considered in the presence of a magnetic field. The magnetic field includes either the externally applied field or the stray field due to ferromagnetic contacts used as injector and collector. When a magnetic field is applied the conductance fluctuations alter the spin precession and moreover spin flip occurs if the magnetic field is perpendicular to the Rashba field. Necessary conditions for a successful spin FET operation is obtained in the presence of a magnetic field.


PACS

72.25.-b Spin polarized transport

73.63.Nm Quantum wires

85.30.Tv Field effect devices

Subjects

Electronics and devices

Condensed matter: electrical, magnetic and optical

Semiconductors

Nanoscale science and low-D systems

Dates

Issue 7 (21 February 2007)

Received 11 October 2006, in final form 7 December 2006

Published 2 February 2007



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