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Magnetic Anisotropy of Maghemite Nanoparticles Probed by RF Transverse Susceptibility

DOI: 10.1016/j.phpro.2015.12.174 DOI Help

Authors: A. I. Figueroa (CSIC-Universidad de Zaragoza; Diamond Light Source) , J. Bartolomé (CSIC-Universidad de Zaragoza) , L. M. García (CSIC-Universidad de Zaragoza) , F. Bartolomé (CSIC-Universidad de Zaragoza) , A. Arauzo (Universidad de Zaragoza) , A. Millán (CSIC-Universidad de Zaragoza) , F. Palacio (CSIC-Universidad de Zaragoza)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physics Procedia , VOL 75 , PAGES 1050 - 1057

State: Published (Approved)
Published: December 2015

Open Access Open Access

Abstract: We present radio frequency magnetic transverse susceptibility measurements on γ-Fe2O3 nanoparticles, which yield an estimation of their effective anisotropy constant, Keff as a function of nanoparticle size. The resulting values range from 4 to 8 × 104 erg/cm3, being on the order of the magnetocrystalline anisotropy in bulk maghemite. Keff values increase as the particle diameter increases. Evidences of anisotropy field distribution given by the size distribution in the samples, and interparticle interactions that increase as the particle size increases, are also observed in the TS measurements. The effects of such interparticle interaction overcome those of thermal fluctuations, in contrast with the behavior of other iron oxide particles.

Journal Keywords: Magnetic nanoparticles; magnetic anisotropy; iron oxide; transverse susceptibility

Subject Areas: Physics, Materials


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