2381/33330 D. Peddis D. Peddis M. T. Qureshi M. T. Qureshi Stephen H. Baker Stephen H. Baker Chris Binns Chris Binns Mervyn Roy Mervyn Roy S. Laureti S. Laureti D. Fiorani D. Fiorani P. Nordblad P. Nordblad R. Mathieu R. Mathieu Magnetic anisotropy and superspin glass behaviour of Fe nanoparticles embedded in Cr and Ag matrices University of Leicester 2015 IR content 2015-10-21 10:04:01 Journal contribution https://figshare.le.ac.uk/articles/journal_contribution/Magnetic_anisotropy_and_superspin_glass_behaviour_of_Fe_nanoparticles_embedded_in_Cr_and_Ag_matrices/10177829 Static and dynamical magnetic properties of Fe nanoparticles (NPs) embedded in non - magnetic (Ag) and antiferromagnetic (Cr) matrices with a volume filling fraction (VFF) of 10% have been investigated . In both Fe@Ag and Fe@Cr nanocomposites , the Fe nanoparticles have a narrow size distribution, with a mean particle diameter around 2 nm. In both samples , the saturation magnetization reaches that of Fe bulk bcc, suggesting the absence of alloying with the matrices. The coercivity at 5 K is much larger in Fe@Cr than in Fe@Ag as a result of the strong interaction between the Fe NPs and the Cr matrix. Temperature - dependent magnetization and ac - susceptibility measurements point out further evidence of the enhanced inter - particle interaction in the Fe@Cr system . While the behavior of Fe@Ag indicates the presence of weakly interacting magnetic monodomain particles with a wide distribution of blocking temperatures , Fe@Cr behaves like a superspin glass produced by the magnetic interaction between nanoparticles.