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Experimental demonstration of room-temperature spin transport in n-type Germanium epilayers
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Dushenko, Sergey, Koike, Masato, Ando, Yuuichiro , Shinjo, Teruya, Myronov, Maksym and Shiraishi, Masashi (2015) Experimental demonstration of room-temperature spin transport in n-type Germanium epilayers. Physical Review Letters, 114 (19). pp. 1-6. 196602 . doi:10.1103/PhysRevLett.114.196602 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.114.196602
Abstract
We report an experimental demonstration of room-temperature spin transport in n-type Ge epilayers grown on a Si(001) substrate. By utilizing spin pumping under ferromagnetic resonance, which inherently endows a spin battery function for semiconductors connected with a ferromagnet, a pure spin current is generated in the n−Ge at room temperature. The pure spin current is detected by using the inverse spin-Hall effect of either a Pt or Pd electrode on n−Ge. From a theoretical model that includes a geometrical contribution, the spin diffusion length in n−Ge at room temperature is estimated to be 660 nm. Moreover, the spin relaxation time decreases with increasing temperature, in agreement with a recently proposed theory of donor-driven spin relaxation in multivalley semiconductors.
| Item Type: | Journal Article | ||||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Germanium crystals, Spintronics | ||||||||
| Journal or Publication Title: | Physical Review Letters | ||||||||
| Publisher: | American Physical Society | ||||||||
| ISSN: | 0031-9007 | ||||||||
| Official Date: | 3 May 2015 | ||||||||
| Dates: |
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| Volume: | 114 | ||||||||
| Number: | 19 | ||||||||
| Number of Pages: | 6 | ||||||||
| Page Range: | pp. 1-6 | ||||||||
| Article Number: | 196602 | ||||||||
| DOI: | 10.1103/PhysRevLett.114.196602 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 18 April 2016 | ||||||||
| Date of first compliant Open Access: | 19 April 2016 | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||
| Grant number: | EP/J003263/1 (EPSRC), EP/J001074/1 (EPSRC) |
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