EDELMAN, I.; IVANOVA, O.; IVANTSOV, I.; VELIKANOV, D.; PETRAKOVSKAJA, E.; ARTEMENKO, A.; CURELY, J.; KLIAVA, J.; ZAIKOVSKIY, V.; STEPANOV, S.

doi:10.1088/1757-899x/25/1/012017

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EDELMAN, I.
L.V. Kirensky Institute of Physics

IVANOVA, O.
L.V. Kirensky Institute of Physics

IVANTSOV, I.
L.V. Kirensky Institute of Physics

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IOP Conference Series : Materials Science and Engineering, IOP Conference Series : Materials Science and Engineering, 2011-05-22, Riga. 2011-12, vol. 25, n° 1, p. 012017 (9 p.)

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Static magnetization (SM), magnetic circular dichroism (MCD) and electron magnetic resonance (EMR) studies are reported of borate glasses 22.5 K2O-22.5 Al2O3-55 B2O3 co-doped with iron and manganese oxides. In as-prepared glasses the paramagnetic ions usually are in diluted state; however, if the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles are found already in as-prepared glass. After additional thermal treatment all glasses show magnetic behaviour, MCD and EMR due to the presence of magnetic nanoparticles with characteristics close to those of manganese ferrite. By computer simulating the EMR spectra at variable temperatures, their morphological characteristics are deduced: relatively broad size and shape distribution with average diameter of ca. 3-4 nm. The characteristic temperature-dependent shift of the apparent resonance field is explained by a strong temperature dependence of the magnetocrystalline anisotropy in the nanoparticles. The potassium-alumina-borate glasses containing magnetic nanoparticles represent a novel class of materials: "transparent magnets". Indeed, they remain transparent in a part of visible and near infrared spectral range while showing magnetic and magneto-optical properties characteristic of magnetically ordered materials.< Réduire

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Magnetic properties and morphology of manganese ferrite nanoparticles in glasses

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