Izvorni znanstveni članak

https://doi.org/10.5562/cca2753

Anomalous Particle Size Dependence of Magnetic Relaxation Phenomena in Goethite Nanoparticles

Cathrine Frandsen orcid.org/0000-0001-5006-924X ; Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Daniel Esmarch Madsen ; Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Chris B. Boothroyd ; Ernst Ruska-Centrum und Peter Grünberg Institut, Forschungszentrum Jülich, D-52425 Jülich, Germany
Steen Mørup ; Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark

Sažetak

By use of Mössbauer spectroscopy we have studied the magnetic properties of samples of goethite nanoparticles with different particle size. The spectra are influenced by fluctuations of the magnetization directions, but the size dependence is not in accordance with the Néel-Brown expression for superparamagnetic relaxation of the magnetization vectors of the particles as a whole. The data suggest that the magnetic fluctuations can be explained by fluctuations of the magnetization directions of small interacting grains within the particles.

Ključne riječi

goethite (α-FeOOH); Mössbauer spectroscopy; magnetic relaxation; nanoparticles

Hrčak ID:

153941

URI

https://hrcak.srce.hr/153941

Datum izdavanja:

31.12.2015.

Posjeta: 1.399 *