Evidence of the Superparamagnetic State in the Zero-Field Microwave Susceptibility Spectra of Ferrimagnetic Nanoparticles
We investigated the static and dynamic magnetic properties of Zn0.4Fe2.6O4 nanoparticles synthesized by thermal decomposition. Two ranges of diameter were used: small particles (diameter about 6.2 nm) and larger ones (diameter about 22.4 nm). The nanoparticle microstructure was characterized by tran...
Saved in:
Published in | IEEE magnetics letters Vol. 11; pp. 1 - 5 |
---|---|
Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Piscataway
IEEE
2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | We investigated the static and dynamic magnetic properties of Zn0.4Fe2.6O4 nanoparticles synthesized by thermal decomposition. Two ranges of diameter were used: small particles (diameter about 6.2 nm) and larger ones (diameter about 22.4 nm). The nanoparticle microstructure was characterized by transmission electron microscopy. The temperature dependence of the zero-field dynamic permeability for both nanoparticle sizes was studied, revealing a superparamagnetic state for the small ones. Effects of the nanoparticle size on the dynamic permeability were analyzied, and linked to the superparamagnetic state. A dynamic susceptibility model was found to reproduce the experimental behavior as well as its temperature dependence. |
---|---|
ISSN: | 1949-307X 1949-3088 |
DOI: | 10.1109/LMAG.2020.3026228 |