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Interface alloying effects in the magnetic properties of Fe nanoislands capped with different materials

DOI: 10.1103/PhysRevB.78.104403 DOI Help

Authors: Y. Huttel (Consejo Superior de Investigaciones Científicas (CSIC)) , E. Gimenez-navarro (Diamond Light Source) , N. D. Telling (University of Manchester) , G. Van Der Laan (Diamond Light Source) , F. Pigazo (Consejo Superior de Investigaciones Científicas (CSIC)) , F. J. Palomares (Consejo Superior de Investigaciones Científicas (CSIC)) , C Quintana (Instituto de Microelectrónica de Madrid-IMM (CNM-CSIC)) , E. Roman (Consejo Superior de Investigaciones Científicas (CSIC)) , G. Armelles (Instituto de Microelectrónica de Madrid-IMM (CNM-CSIC)) , A. Cebollada (Instituto de Microelectrónica de Madrid-IMM (CNM-CSIC))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 78 (10)

State: Published (Approved)
Published: January 2008

Abstract: We show that Fe nanoislands capped with Al, Pd, and Pt protecting layers include an alloy at the interface with the capping layer, which explains the previously known capping layer dependence on the interparticle magnetic coupling. Vibrating sample magnetometry results, for instance, are evidencing a reduction in the magnetization measured under a magnetic field of 15 mT, which is larger in the case of the Al capping and which is due to the presence of a magnetically dead interface alloy. This reduction is also observed at the atomic level using x-ray magnetic circular dichroism measurements, showing a capping layer dependence of the Fe magnetic-moment reduction that is similar for the Pd and Pt capping, and stronger for the Al capping. The trend in the magnetic properties as a function of the capping layer is explained in the light of x-ray photoemission spectroscopy results that evidence the formation of alloys at the interface between the Fe nanoislands and the capping layers. The present results highlight the strong influence of interface alloying in systems of reduced dimensionality. In particular, it is shown that the magnetic properties are strongly affected at both the atomic and macroscopic level.

Subject Areas: Physics

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