Nuclear Magnetic Resonance in Hexaferrite/Maghemite Composite Nanoparticles

• Authors: P. Křišťan , O. Hondlík , H. Štěpánková , V. Chlan , K. Kouřil , R. Řezníček , E. Pollert , P. Veverka
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

76.60.-k; 75.50.Gg; 75.50.Tt; 75.47.Lx; 61.66.Fn

Discipline

• 76.60.-k: Nuclear magnetic resonance and relaxation(see also 33.25.+k Nuclear resonance and relaxation in atomic and molecular physics and 82.56.-b Nuclear magnetic resonance in physical chemistry and chemical physics; for structure determination using magnetic resonance techniques, see 61.05.Qr; for biophysical applications, see 87.80.Lg; for NMR in superconducting materials, see 74.25.nj)
• 61.66.Fn: Inorganic compounds
• 75.50.Gg: Ferrimagnetics
• 75.50.Tt: Fine-particle systems; nanocrystalline materials
• 75.47.Lx: Magnetic oxides

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 514-516

Dates

published

2015-02

Contributors

author

P. Křišťan

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 18000 Prague 8, Czech Republic

author

O. Hondlík

• Faculty of Biomedical Engineering, Czech Technical University in Prague, Sítná sq. 3105, 27201 Kladno, Czech Republic

author

H. Štěpánková

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 18000 Prague 8, Czech Republic

author

V. Chlan

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 18000 Prague 8, Czech Republic

author

K. Kouřil

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 18000 Prague 8, Czech Republic

author

R. Řezníček

• Charles University in Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, 18000 Prague 8, Czech Republic

author

E. Pollert

• Institute of Physics, ASCR, Cukrovarnická 10, 16253 Prague 6, Czech Republic

author

P. Veverka

• Institute of Physics, ASCR, Cukrovarnická 10, 16253 Prague 6, Czech Republic

References

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Identifiers

DOI

10.12693/APhysPolA.127.514