Spin polarized transport current in n-type co-doped ZnO thin films measured by Andreev spectroscopy

Details Spin polarized transport current in n-type co-doped ZnO thin films measured by Andreev spectroscopy Spin polarized transport current in n-type co-doped ZnO thin films measured by Andreev spectroscopy

2009-11-17

arxiv.org/abs/0911.3258v2

Phys Rev B, 80, 245207, 2009

Physics

Condensed Matter

Materials Science

Published version

Scientific paper

10.1103/PhysRevB.80.245207

We use point contact Andreev reflection measurements to determine the spin polarization of the transport current in pulse laser deposited thin films of ZnO with 1% Al and with and without 2%Mn. Only films with Mn are ferromagnetic and show spin polarization of the transport current of up to 55 $\pm$ 0.5% at 4.2 K, in sharp contrast to measurements of the nonmagnetic films without Mn where the polarization is consistent with zero. Our results imply strongly that ferromagnetism in these Al doped ZnO films requires the presence of Mn.

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