Microwave and magneto-optic properties of ε-Fe2O3 nanoparticles arising in borate glasses doped with Fe and Gd

The ε-Fe2O3 nanoparticles in borate glasses co-doped with low concentrations of Fe2O3 and Gd2O3 were investigated with two experimental techniques – visible magnetic circular dichroism (MCD) and electron spin resonance (ESR). The most prominent features of the MCD spectra are: non-linear dependence...

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Bibliographic Details
Main Authors: Ivanova, Oxana, Kliava, Janis, Edelman, Irina, Ivantsov, Ruslan, Petrakovskaja, Eleonora
Format: Conference Proceeding
Language:English
Subjects:
Dependence
Dichroism
Dilution
Electron paramagnetic resonance
Electron spin
Ferric ions
Gadolinium
Gadolinium oxides
Hematite
Iron oxides
Low concentrations
Magnetic properties
Nanoparticles
Spectra
Spin resonance
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Summary:The ε-Fe2O3 nanoparticles in borate glasses co-doped with low concentrations of Fe2O3 and Gd2O3 were investigated with two experimental techniques – visible magnetic circular dichroism (MCD) and electron spin resonance (ESR). The most prominent features of the MCD spectra are: non-linear dependence of the spectral maxima intensities on the Gd concentration and strong increase with the temperature decrease. The ESR spectra of these glasses exhibit two features with g = 4.3 due to the diluted Fe3+ ions and 2.0 associated both with Fe3+ ions and with nanoparticles. The integrated spectra intensities do not follow the T-1 Curie law suggesting a considerable contribution from the magnetically ordered nanoparticles to ESR. Analysis of the MCD and ESR concentration dependences allow suggestion on the Gd ions incorporation into nanoparticles.
ISSN:2101-6275
2100-014X
DOI:10.1051/epjconf/201818503011