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Manganese Perovskite Nanoparticles and the Downturn of Inverse Susceptibility above the Curie Temperature

100%

Maryško M., Pollert E., Kaman O., Veverka P., Jirák Z.

issue 5

792-793

In the La_{0.75}Sr_{0.25}MnO_3 nanoparticle system for hyperthermia a downturn in the inverse susceptibility above the Curie temperature T_{c} was observed and interpreted in terms of a finite width of the T_{c} distribution.

Nuclear Magnetic Resonance in Hexaferrite/Maghemite Composite Nanoparticles

73%

Křišťan P., Hondlík O., Štěpánková H., Chlan V., Kouřil K., Řezníček R., Pollert E., Veverka P.

Acta Physica Polonica A

2015

vol. 127

issue 2

514-516

Due to their bio-compatibility and non-toxicity, ferrimagnetic iron oxides are suitable for various medical applications. In the case of hyperthermia, the promising approach how to reach desired magnetic properties is to combine more phases into a composite material. A series of samples containing maghemite and M-hexaferrite was prepared by sol-gel method with subsequent thermal treatment where annealing temperature and time were varied. The samples were characterized by X-ray diffraction. In this paper we focused mainly on application of nuclear magnetic resonance spectroscopy to investigate these strongly inhomogeneous nanoparticle composites. Frequency-swept ⁵⁷Fe NMR spectra of nanoparticle samples were measured in a zero external magnetic field at 4.2 K. Utilizing differences in optimal excitation field strengths and in relaxation times, we were able to resolve NMR signal assigned to hexagonal ferrite of M-phase from signal which showed features attributed to maghemite.

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2 Acta Physica Polonica A

1 2015

1 2010

2 Pollert E.

2 Veverka P.

1 Chlan V.

1 Hondlík O.

1 Jirák Z.

1 Kaman O.

1 Kouřil K.

1 Křišťan P.

1 Maryško M.

1 Řezníček R.

1 Štěpánková H.

Search results

Manganese Perovskite Nanoparticles and the Downturn of Inverse Susceptibility above the Curie Temperature

Nuclear Magnetic Resonance in Hexaferrite/Maghemite Composite Nanoparticles