Ferromagnetic resonant tunneling diodes as spin polarimeters and polarizers

Details Ferromagnetic resonant tunneling diodes as spin polarimeters and polarizers Ferromagnetic resonant tunneling diodes as spin polarimeters and polarizers

2002-12-11

arxiv.org/abs/cond-mat/0212242v1

Appl. Phys. Lett. 82, 2449 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1063/1.1567812

A method for measuring the degree of spin polarization of magnetic materials based on spin-dependent resonant tunneling is proposed. The device we consider is a ballistic double-barrier resonant structure consisting of a ferromagnetic layer embedded between two insulating barriers. A simple procedure, based on a detailed analysis of the differential conductance, allows to accurately determine the polarization of the ferromagnet. The spin-filtering character of such a system is furthermore addressed. We show that a 100% spin selectivity can be achieved under appropriate conditions. This approach is believed to be well suited for the investigation of diluted magnetic semiconductor heterostructures.

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