ELECTRON SPIN POLARIZATION IN TUNNEL CONTACTS CO0.9FE0.1/MgO/InSb

Мұқаба

Дәйексөз келтіру

Толық мәтін

Аннотация

Lateral spin devices with tunnel contacts Co0.9Fe0.1/MgO/InSb were fabricated using magnetron sputtering and maskless photolithography. The current-voltage characteristics and contact resistance, as well as the Hanle effect during the diffusion of polarized electrons between contacts, were measured. First-principles molecular dynamics calculations were performed to determine the band structure in supercells modeling the Co/MgO and MgO/InSb interfaces. It was shown that at the Co/MgO interface, a significant spin polarization arises for Bloch states of electrons. As a result, the probabilities of passing through the dielectric layer and through the ferromagnetic/dielectric and dielectric/semiconductor interfaces are different for these electrons. The height and width of the tunnel barriers were calculated based on an analysis of the current-voltage characteristics of the tunnel contacts. It was shown that a higher degree of polarization is achieved in tunnel contacts with higher barrier heights and higher resistance. It was also shown that at the MgO/InSb interface, due to the large difference in lattice parameters, there is a high likelihood of defect formation, which prevents achieving high polarization characteristics of the tunnel contacts.

Авторлар туралы

N. Viglin

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

Email: viglin@imp.uran.ru
Ресей, 620108, Yekaterinburg

V. Tsvelikhovskaya

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

Email: viglin@imp.uran.ru
Ресей, 620108, Yekaterinburg

A. Shorikov

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences; Ural Federal University named after Yeltsin

Email: viglin@imp.uran.ru
Ресей, 620108, Yekaterinburg; 620002, Yekaterinburg

T. Pavlov

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

Email: viglin@imp.uran.ru
Ресей, 620108, Yekaterinburg

V. Proglyado

Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: viglin@imp.uran.ru
Ресей, 620108, Yekaterinburg

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