The scope of this article is to report very detailed results of the measurements of magnetic relaxation phenomena in the new Cu 0:5 Fe 2:5 O 4 nanoparticles and known CuFe 2 O 4 nanoparticles. The size of synthesized particles is (6:571:5) nm. Both samples show the superparamagnetic behaviour, with the well-defined phenomena of the blocking of magnetic moment. This includes the splitting of zero-field-cooled and field-cooled magnetic moment curves, dynamical hysteresis, slow quasi-logarithmic relaxation of magnetic moment below blocking temperature. The scaling of the magnetic moment relaxation data at different temperatures confirms the applicability of the simple thermal relaxation model. The two copper-ferrites with similar structures show significantly different magnetic anisotropy density and other magnetic properties. Investigated systems exhibit the consistency of all obtained results. r
The object of the work were spinel ferroxide nanoparticles of Fe 3 O 4 and CuFe 2 O 4 with Jahn-Teller octahedral distortion. The particles were obtained via a soft chemical process, with the particle size being up to 12 ± 5 nm for Fe 3 O 4 and 6.5 ± 3.5 nm for CuFe 2 O 4 . The particles shape was spherical. The crystalline structure and shape evolution of the magnetite particles were investigated by XRD and TEM and compared with properties of particles with larger size. The deviation of the octahedral and tetrahedral voids size radii due to Laplace pressure in the model spinel structire (Fe 3 O 4 ) as a function of the particle size was observed. The magnetic properties of the particles were studied by means of Moessbauer spectroscopy, vibration sample magnetometer measurements and neutron diffraction. The present study demonstrated that the violation of the ferrospinel's cubic cell symmetry results in a higher probability for the appearance in the very small particles of non-colinearity in the spin magnetic moments ordering. , Phone: +359 887 43 02 71, Fax: +359 2 975 32 01 I. Nedkov et al.: Phase and structural particularities of nanosized granular inverse spinels
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.