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Effect of CoFe insertion in Co2MnSi/CoFe/n-GaAs junctions on spin injection properties
| Title: | Effect of CoFe insertion in Co2MnSi/CoFe/n-GaAs junctions on spin injection properties |
| Authors: | Ebina, Yuya Browse this author | | Akiho, Takafumi Browse this author | | Liu, Hong-xi Browse this author | | Yamamoto, Masafumi Browse this author →KAKEN DB | | Uemura, Tetsuya Browse this author →KAKEN DB |
| Issue Date: | 1-May-2014 |
| Publisher: | American Institute of Physics |
| Journal Title: | Applied Physics Letters |
| Volume: | 104 |
| Issue: | 17 |
| Start Page: | 172405 |
| Publisher DOI: | 10.1063/1.4873720 |
| Abstract: | The CoFe thickness (t(CoFe)) dependence of spin injection efficiency was investigated for Co2MnSi/CoFe/n-GaAs junctions. The Delta V-NL/I value, which is a measure of spin injection efficiency, strongly depended on t(CoFe), where Delta V-NL is the amplitude of a nonlocal spin-valve signal, and I is an injection current. Importantly, the maximum value of Delta V-NL/I for a Co2MnSi/CoFe/n-GaAs junction was one order of magnitude higher than that for a CoFe/n-GaAs junction, indicating that a Co2MnSi electrode works as a highly polarized spin source. No clear spin signal, on the other hand, was observed for a Co2MnSi/n-GaAs junction due to diffusion of Mn atoms into the GaAs channel. Secondary ion mass spectrometry analysis indicated that the CoFe insertion effectively suppressed the diffusion of Mn into GaAs, resulting in improved spin injection properties compared with those for a Co2MnSi/n-GaAs junction. (C) 2014 AIP Publishing LLC. |
| Rights: | Copyright 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 104, 172405 (2014) and may be found at http://scitation.aip.org/content/aip/journal/apl/104/17/10.1063/1.4873720 |
| Type: | article |
| URI: | http://hdl.handle.net/2115/57041 |
| Appears in Collections: | 情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 植村 哲也
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