Inelastic neutron scattering studyof spin dynamics in cobalt chromite nanoparticles
Nanoparticles within size range of 1-20 nm are known to exhibit interesting physical and chemical properties that can significantly differ from those of bulk materials due to the size effect. The most prominent is superparamagnetism (SPM), which is a thermally driven magnetization reversal. CoCr2O4 nanoparticles have been synthesized and show a transition from paramagnetic to SPM phase in contrast with the transition from paramagnetic to long-range ferrimagnetic phase reported in bulk. We propose to carry out a thorough investigation of the magnetic dynamics of CoCr2O4 nanoparticles on IN5 or IN6 at ILL. Our aim is to extract the superparamagnetic fluctuations and collective magnetic excitations simultaneously at various temperatures and external fields.
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FU Zhendong; BRUECKEL Thomas; KOZA Michael Marek; OLLIVIER Jacques and Yixi Su. (2015). Inelastic neutron scattering studyof spin dynamics in cobalt chromite nanoparticles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-03-1713
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