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Modeling spin transport with current-sensing spin detectors Jing Li and Ian Appelbauma

Summary: Modeling spin transport with current-sensing spin detectors
Jing Li and Ian Appelbauma
Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland,
College Park, Maryland 20742, USA
Received 13 August 2009; accepted 10 September 2009; published online 12 October 2009
By incorporating the proper boundary conditions, we analytically derive the impulse response or
"Green's function" of a current-sensing spin detector. We also compare this result to a Monte Carlo
simulation which automatically takes the proper boundary condition into account and an empirical
spin transit time distribution obtained from experimental spin precession measurements. In the
strong drift-dominated transport regime, this spin current impulse response can be approximated by
multiplying the spin density impulse response by the average drift velocity. However, in weak drift
fields, large modeling errors up to a factor of 3 in most-probable spin transit time can be incurred
unless the full spin current Green's function is used. 2009 American Institute of Physics.
Measuring spin-polarized electron transport requires
both robust spin generation and spin detection.13
To extract
meaningful spin transport parameters, modeling the response
characteristics of these components is essential. In particular,
the details of the spin detection mechanism can impose very


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science