%0 Journal Article
%A Zeleňáková, A.
%A Zeleňák, V.
%A Matko, I.
%A Strečková, M.
%A Hrubovčák, P.
%A Kováč, J.
%T Superferromagnetism in chain-like Fe@SiO<sub>2</sub> nanoparticle ensembles
%J Journal of applied physics
%V 116
%N 3
%@ 1089-7550
%C Melville, NY
%I American Institute of Physics
%M DESY-2014-03389
%P 033907 
%D 2014
%X One-dimensional (1D) chain-like nanocomposites, created by ensembles of nanoparticles of with diameter ∼ 13 nm, which are composed of an iron core (∼4 nm) and a silica protective layer, were prepared by a self-assembly process. Chain-like Fe@SiO2 ensembles were formed due to strong magnetic dipole–dipole interactions between individual Fe nanoparticles and the subsequent fixation of the Fe particles by the SiO2 layers. X-ray near edge absorption spectra measurements at the Fe K absorption edge confirm that the presence of a silica layer prevents the oxidation of the magnetic Fe core. Strong magnetic interactions between Fe cores lead to long-range ordering of magnetic moments, and the nanoparticle ensembles exhibit superferromagnetic characteristics demonstrated by a broad blocking Zero-field cooling (ZFC)/field-cooling distribution, nearly constant temperature dependence of ZFC magnetization, and non-zero coercivity at room temperature. Low room-temperature coercivity and the presence of electrically insulating SiO2 shells surrounding the Fe core make the studied samples suitable candidates for microelectronic applications.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000340710500043
%R 10.1063/1.4890354
%U https://bib-pubdb1.desy.de/record/171848