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Barquín, L. Fernndez
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article
Interfacial magnetic coupling between Fe nanoparticles in Fe-Ag granular alloys
Abstract
<p>The role of the interface in mediating interparticle magnetic interactions has been analysed in Fe <sub>50</sub>Ag <sub>50</sub> and Fe <sub>55</sub>Ag <sub>45</sub> granular thin films deposited by the pulsed laser deposition technique (PLD). These samples are composed of crystalline bcc Fe (2-4nm) nanoparticles and fcc Ag (10-12nm) nanoparticles, separated by an amorphous Fe <sub>50</sub>Ag <sub>50</sub> interface, occupying around 20% of the sample volume, as determined by x-ray diffraction (XRD), x-ray absorption spectroscopy (XAS), and high resolution transmission electron microscopy (HRTEM). Interfacial magnetic coupling between Fe nanoparticles is studied by dc magnetization and x-ray magnetic circular dichroism (XMCD) measurements at the FeKand Ag L <sub>2, 3</sub>edges. This paper reveals that these thin films present two magnetic transitions, at low and high temperatures, which are strongly related to the magnetic state of the amorphous interface, which acts as a barrier for interparticle magnetic coupling.</p>