Abstract
The role of the interface in mediating interparticle magnetic interactions has been analysed inFe50Ag50 andFe55Ag45 granular thin films deposited by the pulsed laser deposition technique(PLD). These samples are composed of crystalline bcc Fe (2–4 nm)nanoparticles and fcc Ag (10–12 nm) nanoparticles, separated by an amorphousFe50Ag50 interface, occupying around 20% of the sample volume, as determined by x-ray diffraction(XRD), x-ray absorption spectroscopy (XAS), and high resolution transmission electronmicroscopy (HRTEM). Interfacial magnetic coupling between Fe nanoparticles is studied by dcmagnetization and x-ray magnetic circular dichroism (XMCD) measurements at the Fe K and AgL2, 3 edges. This paper reveals that these thin films present two magnetic transitions, at lowand high temperatures, which are strongly related to the magnetic state of theamorphous interface, which acts as a barrier for interparticle magnetic coupling.
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