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

Karen A. Yates; Anthony J. Behan; James R. Neal; David S. Score; Harry J. Blythe; Gillian A. Gehring; Steve M. Heald; Will R. Branford; Lesley F. Cohen

doi:10.1103/PhysRevB.80.245207

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

Karen A. Yates, Anthony J. Behan, James R. Neal, David S. Score, Harry J. Blythe, Gillian A. Gehring, Steve M. Heald, Will R. Branford, Lesley F. Cohen

DOI 10.1103/PhysRevB.80.245207 · Physical Review B

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Abstract

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±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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.2	Pressure not reported	unknown