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

Article

关键词: HIGH-TEMPERATURE FERROMAGNETISM;    MN-DOPED ZNO;    ROOM-TEMPERATURE;    TRANSITION;    SEMICONDUCTORS;    SPINTRONICS;    MAGNETISM;    ORIGIN;    SYSTEM;   

DOI  :  10.1103/PhysRevB.80.245207

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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