Spin transport and relaxation in germanium detected by electrical measurements (Conference Presentation)

Kohei Hamaya

doi:10.1117/12.2320477

18 September 2018 Spin transport and relaxation in germanium detected by electrical measurements (Conference Presentation)

Kohei Hamaya

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 107320H (2018) https://doi.org/10.1117/12.2320477
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Here we show spin transport and spin relaxation phenomena in germanium (Ge) up to room temperature. Using four-terminal nonlocal voltage and Hanle-effect measurements in lateral spin-valve devices with ferromagnet/Ge Schottky-tunnel contacts, we detected reliable spin transport from low temperatures to room temperature in n-Ge and discussed the spin relaxation mechanism in the conduction band of Ge [1-4]. We also demonstrated the detection of the spin transport in p-Ge by using vertically stacked structures including ferromagnet/Ge interfaces on Si [5,6]. From the magnitude of the spin signals, we also discussed the spin relaxation in p-Ge up to room temperature. From the viewpoint of low contact resistance for applications in the field of group-IV semiconductor spintronics, our technologies are more suitable than ferromagnet/MgO tunnel contacts. [1] Y. Fujita, KH et al., Phys. Rev. B 94, 245302 (2016). [2] M. Yamada, KH et al., Phys. Rev. B 95, 161304(R) (2017). [3] Y. Fujita, KH et al., Phys. Rev. Appl. 8, 014007 (2017). [4] M. Yamada, KH et al., Appl. Phys. Exp. 10, 093001 (2017). [5] M. Kawano, KH et al., Appl. Phys. Lett. 109, 022406 ¬(2016). [6] M. Kawano, KH et al., Phys. Rev. Mater. 1, 034604 (2017). The author appreciates good collaborative research with Prof. K. Sawano, Prof. V. Lazarov, and the colleagues of our group in Osaka University. This work was partly supported by KAKENHI (No. 25246020, 16H02333, 17H06120, 26103003) from JSPS/MEXT.

Conference Presentation

Citation Download Citation

Kohei Hamaya "Spin transport and relaxation in germanium detected by electrical measurements (Conference Presentation)", Proc. SPIE 10732, Spintronics XI, 107320H (18 September 2018); https://doi.org/10.1117/12.2320477

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available