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Magnetic and structural changes in Cu1-xAlx alloy matrix - embedded Fe nanoparticles systems

DOI: 10.1016/j.jmmm.2018.08.040 DOI Help

Authors: M. S. Kurt (University of Leicester; Erzurum Technical University) , S. H. Baker (University of Leicester) , M. Roy (University of Leicester) , M. R. Lees (The University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Magnetism And Magnetic Materials

State: Published (Approved)
Published: August 2018
Diamond Proposal Number(s): 12400

Abstract: We describe the atomic structure and magnetism in Fe nanoparticles (∼2 nm) ebedded in a Cu1-xAlx alloy matrix. Nanocomposite films for these studies were prepared directly from gas phase using a flexible co-deposition technique under Ultra-High Vacuum (UHV) conditions. Fe nanoparticles and the alloy matrix were prepared using a gas aggregation source and MBE sources respectively. Extended x-ray absorption fine structure (EXAFS) experiments indicate that the embedded Fe nanoparticles retain a bcc structure for Al-contents greater than x = 0.13 but, for Al-contents lower than this value, Fe nanoparticles have both fcc and bcc structures. The magnetic moment per Fe atom initially increases with increasing Al-content due to the bcc structure becoming more dominant in the embedded nanoparticles as the Al-content is increased, but then decreases with further increase in Al-content. This decrease is consistent with a modest degree of alloying between Fe and Al atoms at the particle/matrix interfaces.

Journal Keywords: Fe nanoparticles; Magnetic; Atomic structure; EXAFS

Subject Areas: Materials, Physics

Instruments: B18-Core EXAFS