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  • Collective magnetic behavior of CoFe2O4 nanoparticles with diameters of 76, 16, 15 and 8 nm, respectively, prepared by di erent chemical methods has been investigated. Particle composition, size and structure have been characterized by inductive coupled plasma (ICP), transmission elektron microscopy (TEM) and powder X-ray di raction (PXRD). Basic magnetic properties have been determined from the temperature dependence of magnetization and magnetization isotherms measurements. The three samples exhibit characteristic of a superparamagnetic system with the presence of strong interparticle interactions. Magnetic relaxation phenomena have been examined via frequency-dependent ac susceptibility measurements and aging and memory e ect experiments. For the particles coated with oleic acid, it has been demonstrated that the sample reveals all attributes of a super-spin glass (SSG) system with strong interparticle interactions.
  • Collective magnetic behavior of CoFe2O4 nanoparticles with diameters of 76, 16, 15 and 8 nm, respectively, prepared by di erent chemical methods has been investigated. Particle composition, size and structure have been characterized by inductive coupled plasma (ICP), transmission elektron microscopy (TEM) and powder X-ray di raction (PXRD). Basic magnetic properties have been determined from the temperature dependence of magnetization and magnetization isotherms measurements. The three samples exhibit characteristic of a superparamagnetic system with the presence of strong interparticle interactions. Magnetic relaxation phenomena have been examined via frequency-dependent ac susceptibility measurements and aging and memory e ect experiments. For the particles coated with oleic acid, it has been demonstrated that the sample reveals all attributes of a super-spin glass (SSG) system with strong interparticle interactions. (en)
Title
  • Relaxation phenomena in ensembles of CoFe2O4 nanoparticles
  • Relaxation phenomena in ensembles of CoFe2O4 nanoparticles (en)
skos:prefLabel
  • Relaxation phenomena in ensembles of CoFe2O4 nanoparticles
  • Relaxation phenomena in ensembles of CoFe2O4 nanoparticles (en)
skos:notation
  • RIV/68378271:_____/12:00377160!RIV13-AV0-68378271
http://linked.open...avai/riv/aktivita
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  • Z(AV0Z10100520)
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  • 6
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  • 164886
http://linked.open...ai/riv/idVysledku
  • RIV/68378271:_____/12:00377160
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  • CoFe2O4; super-spin-glass; coprecipitation; decomposition; dynamic magnetic properties (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • NL - Nizozemsko
http://linked.open...ontrolniKodProRIV
  • [BF075B6C3B41]
http://linked.open...i/riv/nazevZdroje
  • Journal of Magnetism and Magnetic Materials
http://linked.open...in/vavai/riv/obor
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http://linked.open...UplatneniVysledku
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  • 324
http://linked.open...iv/tvurceVysledku
  • Poltierová Vejpravová, Jana
  • Bittová, Barbara
  • Mantlíková, A.
  • Roca, A. G.
  • Morales, M. P.
http://linked.open...ain/vavai/riv/wos
  • 000298864100048
http://linked.open...n/vavai/riv/zamer
issn
  • 0304-8853
number of pages
http://bibframe.org/vocab/doi
  • 10.1016/j.jmmm.2011.11.005
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