<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>Nanocrystalline iron was obtained by fusing magnetite and promoters. The oxidized form was reduced with hydrogen and passivated (sample P0). The average nanocrystallite size in sample P0 was d(P0) =16 nm and the width of size distribution was σ(P0) = 18 nm. Samples of nanocrystalline iron with narrower diameter ranges and larger and smaller average crystallite sizes were also synthesized. They were: sample P1 (d(P1) = 28 nm, σ(P1) = 5 nm), sample P2 (d(P2) = 22 nm, σ(P1) = 5 nm), sample P3 (d(P3) = 12 nm, σ(P1) = 9 nm). These four samples were studied at room temperature by dc magnetization measurements and ferromagnetic resonance at microwave frequency. Correlations between samples sizes distributions (average size and width of the sizes) and magnetic parameters (effective magnetization, anisotropy field, anisotropy constant, FMR linewidth) were investigated. It was found that the anisotropy field and effective magnetization determined from FMR spectra scale linearly with nanoparticle sizes, while the effective magnetic anisotropy constant determined from the hysteresis loops decreases with nanoparticle size increase.</p></abstract>

Nanocrystalline iron was obtained by fusing magnetite and promoters. The oxidized form was reduced with hydrogen and passivated (sample P0). The average nanocrystallite size in sample P0 was d(P0) =16 nm and the width of size distribution was σ(P0) = 18 nm. Samples of nanocrystalline iron with narrower diameter ranges and larger and smaller average crystallite sizes were also synthesized. They were: sample P1 (d(P1) = 28 nm, σ(P1) = 5 nm), sample P2 (d(P2) = 22 nm, σ(P1) = 5 nm), sample P3 (d(P3) = 12 nm, σ(P1) = 9 nm). These four samples were studied at room temperature by dc magnetization measurements and ferromagnetic resonance at microwave frequency. Correlations between samples sizes distributions (average size and width of the sizes) and magnetic parameters (effective magnetization, anisotropy field, anisotropy constant, FMR linewidth) were investigated. It was found that the anisotropy field and effective magnetization determined from FMR spectra scale linearly with nanoparticle sizes, while the effective magnetic anisotropy constant determined from the hysteresis loops decreases with nanoparticle size increase.

Magnetic characterization of nanocrystalline iron samples with different size distributions

Institute of Physics, West Pomeranian University of Technology, 48 Piastow Str., 70-311, Szczecin, Poland

Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, 10 Pulaskiego Str., 70-322, Szczecin, Poland

Department of Solid State Physics, Faculty of Physics, University of Athens, Panepistimiopolis, 15 784, Zografos, Athens, Greece

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Nanocrystalline iron was obtained by fusing magnetite and promoters. The oxidized form was reduced with hydrogen and passivated (sample P0). The average...

Magnetic characterization of nanocrystalline iron samples with different size distributions

Pubblicato online: 17 ott 2014

Pagine: 423 - 429

DOI: https://doi.org/10.2478/s13536-014-0223-z

Parole chiave
nanocrystalline iron, ferromagnetic resonance, magnetic property

© 2014 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Magnetic characterization of nanocrystalline iron samples with different size distributions

Pubblicato online: 17 ott 2014

Pagine: 423 - 429

DOI: https://doi.org/10.2478/s13536-014-0223-z

Parole chiavenanocrystalline iron, ferromagnetic resonance, magnetic property

© 2014 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Parole chiave
nanocrystalline iron, ferromagnetic resonance, magnetic property