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Magnetism and structure in nanocomposite Fe nanoparticle/Al matrix films

DOI: 10.1016/j.jallcom.2019.151653 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 (University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds

State: Published (Approved)
Published: July 2019
Diamond Proposal Number(s): 12400

Abstract: We describe magnetometry measurements performed on nanocomposite films formed of Fe nanoparticles embedded in Al matrix. The samples were prepared using a flexible co-deposition technique under Ultra-High Vacuum (UHV) environments. Fe nanoparticles, made by using a gas aggregation source, were co-deposited with an atomic Al beam, made by an MBE source. The Volume Filling Fraction (VFF) of nanoparticles was varied controllably between 4% and 45%, while the mean diameter of Fe nanoparticles produced by the source was ∼ 2 nm. Fe K edge extended x-ray absorption fine structure (EXAFS) experiments show that there is a high degree of alloying between Fe nanoparticles and Al atoms. Magnetism in the embedded Fe nanoparticle samples was investigated using a SQUID magnetometer. Atomic moment of Fe in the Fe/Al nanocomposite films increases slightly when the proportion of Fe nanoparticles is increased, but is still significantly lower than the bulk Fe value. In a more detailed analysis, the magnetisation curves were fitted using the Random Anisotropy Model (RAM) which allowed the exchange field and random anisotropy field to be evaluated. The findings and issues raised by this approach are discussed.

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

Subject Areas: Materials, Physics


Instruments: B18-Core EXAFS