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Magnetic and transport properties of epitaxial discontinuous Fe/MgO multilayers

AuthorsGarcía-García, A.; Pardo, J. A.; Strichovanec, Pavel; Vovk, A.; Teresa, José María de ; Algarabel, Pedro A. ; Ibarra, M. Ricardo
Issue Date2012
CitationICM 2012
AbstractDiscontinuous metal-insulator multilayers (DMIMs) are cermet structures prepared by repeated alternate deposition of a continuous insulating and a discontinuous metal layer. However, little attention has been paid to the influence of the substrate nature, deposition temperature, and degree of crystallinity of the insulator layer on transport properties of DMIMs. In recent work we reported tunnelling magnetoresistance (TMR) values for epitaxial Fe/MgO DMIMs deposited on single-crystalline MgO(001) substrates. Here we report a comparison of the magnetic and transport properties of DMIMs [Fe (0.6 nm)/MgO (3 nm)]10 deposited on two different substrates: Corning Glass (CG) and single-crystalline MgO(001) with deposition temperatures (Ts) ranging from 20 ºC to 250 ºC. Zero field cooled and field cooled magnetic susceptibility measurements were carried for H=50 Oe and 5K<T<300K. The samples exhibit superparamagnetic behaviour. For temperatures higher than the bifurcation temperature (TB) the susceptibility measurements were fitted using a Curie-Weiss law and the average size (Davg) of the magnetic grains was obtained. More precise determination of Davg. and their distribution was done by measuring magnetization isotherms for T>TB. We observed that the Fe grains volume is bigger for the samples prepared on MgO substrates. The relationship between transport and magnetic properties will be discussed.
DescriptionResumen del trabajo presentado a la 19th International Conference on Magnetism celebrada en Korea del 8 al 13 de julio de 2012.-- et al.
Appears in Collections:(ICMA) Comunicaciones congresos
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