%0 Journal Article
%A Feygenson, M.
%A Schweika, W.
%A Ioffe, A.
%A Vakhrushev, S. B.
%A Brückel, T.
%T Magnetic phase transition in confined MnO nanoparticles studied by polarized neutron scattering
%J Physical review / B
%V 81
%N 6
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-8838
%P 064423
%D 2010
%Z Record converted from VDB: 12.11.2012
%X We have investigated the magnetic ordering and the phase transition in MnO nanoparticles confined in a porous glass using polarized neutron scattering. These MnO nanoparticles are best described as extended wormlike structures with a mean diameter of 70 angstrom. We observe an apparent continuous magnetic phase transition in MnO nanoparticles, in contrast to the well-known discontinuous phase transition in bulk MnO. By polarization analysis, separating the magnetic scattering, it is found that within the individual MnO nanoparticles about 60% of atoms remain disordered in the low-temperature limit, presumably due to interactions between nanoparticles and glass walls. The continuous character of the phase transition and the unusual temperature dependence suggests a surface-induced disorder phenomenon.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000274998100074
%R 10.1103/PhysRevB.81.064423
%U https://juser.fz-juelich.de/record/8838