TY  - JOUR
AU  - Zeleňáková, A.
AU  - Zeleňák, V.
AU  - Matko, I.
AU  - Strečková, M.
AU  - Hrubovčák, P.
AU  - Kováč, J.
TI  - Superferromagnetism in chain-like Fe@SiO<sub>2</sub> nanoparticle ensembles
JO  - Journal of applied physics
VL  - 116
IS  - 3
SN  - 1089-7550
CY  - Melville, NY
PB  - American Institute of Physics
M1  - DESY-2014-03389
SP  - 033907 
PY  - 2014
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000340710500043
DO  - DOI:10.1063/1.4890354
UR  - https://bib-pubdb1.desy.de/record/171848
ER  -