期刊
NANO LETTERS
卷 11, 期 10, 页码 4431-4437出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl2026426
关键词
Spin polarization; Andreev reflection; Fe1-xCoxSi; nanowire; APT; XMCD; spintronics
类别
资金
- Research Corporation for Science Advancement
- NSF [CBET-1048625]
- Sloan Research Fellowship
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
We report a general method for determining the spin polarization from nanowire materials using Andreev reflection spectroscopy implemented with a Nb superconducting contact and common electron-beam lithography device fabrication techniques. This method was applied to magnetic semi-conducting Fe1-xCoxSi alloy nanowires with (x) over bar = 0.23, and the average spin polarization extracted from 6 nanowire devices is 28 +/- 7% with a highest observed value of 35%. Local-electrode atom probe tomography (APT) confirms the homogeneous distribution of Co atoms in the FeSi host lattice, and X-ray magnetic circular dichroism (XMCD) establishes that the elemental origin of magnetism in this strongly correlated electron system is due to Co atoms.
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