Abstract
We investigated spin-dependent transport properties in CoFe/MgO/n+-Si junctions by measuring Hanle signals and their dependence on the measurement frequency. The CoFe/MgO/n+-Si junctions exhibited two types of Hanle curves with different half-widths. Hanle signals with a broad half-width were observed mainly in the low-bias region, and these signals exhibited apparent frequency dependence and disappeared in the highfrequency region though Hanle signals with narrow half-widths were almost independent of the measurement frequency used in this study. This frequency dependence is explained by the mechanism of two-step tunneling. These results show that investigating the frequency response signals gives clear information on spin-dependent transport mechanisms.
Original language | English |
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Article number | 073002 |
Journal | Applied Physics Express |
Volume | 9 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2016 Jul |
Externally published | Yes |
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)