Magnetic and transport properties of evaporated Fe/SiO multilayers

M. Anas (1) , C. Bellouard (2) , M. Vergnat (2)

1 Haluoleo University
2 LPM - Laboratoire de physique des matériaux

Fe/SiO discontinuous multilayers consisting of layers of Fe particles embedded in an insulating SiO matrix have been prepared by evaporation. Their structural, magnetic, and transport properties have been studied as a function of Fe and SiO thickness. For small iron thicknesses, magnetic measurements show a superparamagnetic behavior above a blocking temperature determined by field-cooled and zero-field-cooled magnetization curves. Negative magnetoresistance due to spin-dependent tunneling has been observed in both current-in-plane and current-perpendicular-to-the-plane geometries. For the smaller iron thickness 5 Å͒, a Coulomb blockade effect is observed at low temperature together with an increase of the magnetoresistance.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

M. Anas, C. Bellouard, M. Vergnat. Magnetic and transport properties of evaporated Fe/SiO multilayers. Journal of Applied Physics, 2004, 96 (2), pp.1159-1164. ⟨10.1063/1.1762998⟩. ⟨hal-02164222⟩