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Synthesis and magnetic properties of CoFe{sub 2}O{sub 4} spinel ferrite nanoparticles doped with lanthanide ions
Creator/Author	Kahn, Myrtil L. ; Zhang, Z. John
Publication Date	2001 Jun 04
OSTI Identifier	OSTI ID: 40203182
Other Number(s)	Journal ID: ISSN 0003-6951; TRN: IM200106%%28
Resource Type	Journal Article
Resource Relation	Journal Name: Applied Physics Letters; Journal Volume: 78; Journal Issue: 23; Other Information: DOI: 10.1063/1.1377621; Othernumber: APPLAB000078000023003651000001; 021123APL; PBD: 4 Jun 2001
Sponsoring Org	(US)
Subject	71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COBALT; FERRITE; FERRITES; MAGNETIC PROPERTIES; MODULATION; PHYSICS; RARE EARTHS; SPINELS; SYNTHESIS
Description/Abstract	Lanthanide ions have been doped into cobalt spinel ferrites using an oil-in-water micellar method to form CoLn{sub 0.12}Fe{sub 1.88}O{sub 4} nanoparticles with Ln=Ce, Sm, Eu, Gd, Dy, or Er. Doping with lanthanide ions (Ln{sup III}) modulates the magnetic properties of cobalt spinel ferrite nanoparticles. In particular cases of Gd{sup 3+} or Dy{sup 3+} ions, a dramatic increase in the blocking temperature and coercivity is observed. Indeed, the introduction of only 4% of Gd{sup 3+} ions increases the blocking temperature {similar_to}100 K and the coercivity 60%. Initial studies on the magnetic properties of these doped nanoparticles clearly demonstrate that the relationship between the modulation of magnetic properties and the nature of doped Ln{sup III} ions is interesting but very complex. {copyright} 2001 American Institute of Physics.