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arXiv 0911.3258cond-mat.mtrl-sci
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Andreev光谱法测量n型共掺杂ZnO薄膜的自旋极化输运电流

Spin polarized transport current in n-type co-doped 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

摘要:

用点接触Andreev反射法测量了脉冲激光沉积的含1%Al和含2%Mn的ZnO薄膜中输运电流的自旋极化。只有膜与Mn是铁磁性的,并显示自旋极化的传输电流高达55 $\pm$ 0.5%,在4.2 K,在鲜明的对比,测量的无Mn膜的极化是一致的零。我们的研究结果强烈暗示,铁磁性在这些Al掺杂的ZnO薄膜需要Mn的存在下。

英文摘要:

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 $\pm$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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