TY  - JOUR
AU  - Feygenson, M.
AU  - Schweika, W.
AU  - Ioffe, A.
AU  - Vakhrushev, S. B.
AU  - Brückel, T.
TI  - Magnetic phase transition in confined MnO nanoparticles studied by polarized neutron scattering
JO  - Physical review / B
VL  - 81
IS  - 6
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-8838
SP  - 064423
PY  - 2010
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000274998100074
DO  - DOI:10.1103/PhysRevB.81.064423
UR  - https://juser.fz-juelich.de/record/8838
ER  -