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Magnetic properties and rotational hysteresis of Fe3O4 and gamma-Fe2O3 particles similar to 250 nm in diameter

Schmidbauer, E., and R. Keller (1996), Magnetic properties and rotational hysteresis of Fe3O4 and gamma-Fe2O3 particles similar to 250 nm in diameter, Journal of Magnetism and Magnetic Materials, 152(1-2).

Abstract
We report the magnetic properties for dispersed, spherical Fe3O4 and gamma-Fe2O3 particles similar to 250 nm in diameter in the temperature range T = 4.2-294 K. For Fe3O4, hysteresis properties show anomalies at 130 K, where the magnetocrystalline anisotropy constant K-1 vanishes; the ratio H-c/I-s (H-c = coercive force, I-s = saturation magnetization) follows a linear relationship with K-1/I-s(2) between 130 and 294 K. Below the Verwey transition temperature T-V (similar to 120 K), the hysteresis properties depend on whether the sample is cooled in a strong magnetic field or in zero field; no magnetic anomalies were observed for gamma-Fe2O3 particles, generated by oxidizing the Fe3O4 particles under study. The rotational hysteresis integral at 294 K is similar to 0.7 for both compounds, pointing to a coherent-type magnetization reversal for assumed uniaxial single-domain particles (SDPs); however, the reduced saturation remanence is only similar to 0.2, far below that for SDPs. Possible models for the particle magnetization modes are discussed.
BibTeX
@article{id232,
  author = {E. Schmidbauer and R. Keller},
  journal = {Journal of Magnetism and Magnetic Materials},
  number = {1-2},
  title = {{Magnetic properties and rotational hysteresis of Fe3O4 and gamma-Fe2O3 particles similar to 250 nm in diameter}},
  volume = {152},
  year = {1996},
  language = {en},
}
EndNote
%0 Journal Article
%A Schmidbauer, E.
%A Keller, R.
%D 1996
%N 1-2
%V 152
%J Journal of Magnetism and Magnetic Materials
%T Magnetic properties and rotational hysteresis of Fe3O4 and gamma-Fe2O3 particles similar to 250 nm in diameter
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Printed 20. Aug 2019 17:56