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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

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.114.196602

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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
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of 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:
DateEvent
3 May 2015Published
15 May 2015Accepted
8 September 2014Submitted
Date of first compliant deposit: 18 April 2016
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
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/J003263/1 (EPSRC), EP/J001074/1 (EPSRC)

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