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Efficient Spin Injection into Silicon and the Role of the Schottky Barrier

André Dankert (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Dulal Ravi Sharma (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Saroj Prasad Dash (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Scientific Reports (2045-2322). Vol. 3 (2013),
[Artikel, refereegranskad vetenskaplig]

Implementing spin functionalities in Si, and understanding the fundamental processes of spin injection and detection, are the main challenges in spintronics. Here we demonstrate large spin polarizations at room temperature, 34% in n-type and 10% in p-type degenerate Si bands, using a narrow Schottky and a SiO2 tunnel barrier in a direct tunneling regime. Furthermore, by increasing the width of the Schottky barrier in non-degenerate p-type Si, we observed a systematic sign reversal of the Hanle signal in the low bias regime. This dramatic change in the spin injection and detection processes with increased Schottky barrier resistance may be due to a decoupling of the spins in the interface states from the bulk band of Si, yielding a transition from a direct to a localized state assisted tunneling. Our study provides a deeper insight into the spin transport phenomenon, which should be considered for electrical spin injection into any semiconductor.

Nyckelord: ROOM-TEMPERATURE, POLARIZATION, SPINTRONICS, FERROMAGNET, TRANSPORT



Denna post skapades 2013-12-16. Senast ändrad 2013-12-16.
CPL Pubid: 189237

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik

Ämnesområden

Fysik

Chalmers infrastruktur

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