Temperature dependence of the magnetization of disc shaped NiO nanoparticles

Stine Nyborg Klausen, P.A. Lindgard, Kim Lefmann, Franz Bødker, Steen Mørup

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

We present neutron diffraction data of NiO nanoparticles measuring the total magnetization and the sublattice magnetization at various temperatures. Electron microscopy shows that the particles are disc shaped with average diameter of about 12 nm and a thickness of about 2 nm. The Neel temperature (approximate to460 K) is less than for bulk NiO (523 K). The magnetic domain size, as estimated from the width of the neutron diffraction peaks corresponding to the antiferromagnetic reflection is smaller than the particle size estimated from the structural peaks. A ferromagnetic contribution is present as a temperature dependent contribution of a structural peak in contrast to bulk NiO. The two magnetic signals vanish at the same temperature. The data are interpreted on the basis of an extended mean field model on disc shaped NiO particles. This model includes the finite size dependence of the effective field experienced on the position of the atom. The experimental findings are in agreement with the theoretical model.
Original languageEnglish
JournalPHYSICA STATUS SOLIDI A-APPLIED RESEARCH
Volume189
Issue number3
Pages (from-to)1039-1042
ISSN0031-8965
DOIs
Publication statusPublished - 2002
Event1st Seeheim Conference on Magnetism (SCM2001) - Seehiem, Germany
Duration: 9 Sep 200113 Sep 2001
Conference number: 1

Conference

Conference1st Seeheim Conference on Magnetism (SCM2001)
Number1
CountryGermany
CitySeehiem
Period09/09/200113/09/2001

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