Magnetism

Nonlinearity and hysteresis in longitudinal current transport in CoSi/GaAs alloy layers deposited from laser plasma

E. S. Demidov, S. N. Gusev, V. V. Podol'skii, V. P. Lesnikov, V. V. Sdobnyakov, L. I. Budarin, A. A. Tronov, E. V. Skopin

Lobachevsky State University of Nizhny Novgorod

Abstract: The electron transport properties of nanosized CoSi alloy layers deposited at a lowered temperature (350$^\circ$C) from laser plasma onto single-crystalline gallium arsenide have been studied. An asymmetry of the current-voltage characteristic (CVC) in the longitudinal current transport in such layers has been found, which indicates the spin polarization of charge carriers, and a substantial (up to 18%) nonlinearity and a hysteresis (up to 4%) have been revealed both at room temperature and at 77 K for comparatively low current densities (up to 5 $\times$ 10$^4$ A/cm$^2$). In repeated cycles of CVC measurements at 77 K, irreversible changes in the properties of the layers have been observed.

Received: 14.01.2013

 English version: Physics of the Solid State, 2013, 55:7, 1407–1411

Bibliographic databases:

•