Magnetic anisotropy in spherical Fe16N2 core–shell nanoparticles determined by torque measurements | Zendy

Eiji Kita | Zendy; K. Shibata | Zendy; Yuji C. Sasaki | Zendy; Mikio Kishimoto | Zendy; Hideto Yanagihara | Zendy

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Magnetic anisotropy in spherical Fe16N2 core–shell nanoparticles determined by torque measurements

Author(s) -

Eiji Kita,

K. Shibata,

Yuji C. Sasaki,

Mikio Kishimoto,

Hideto Yanagihara

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4974276

Subject(s) - anisotropy , condensed matter physics , magnetic anisotropy , materials science , magnetization , hysteresis , saturation (graph theory) , anisotropy energy , magnetic nanoparticles , magnetic hysteresis , nuclear magnetic resonance , nanoparticle , magnetic field , physics , nanotechnology , optics , quantum mechanics , mathematics , combinatorics

The magnetic anisotropy energy for core–shell α”-Fe16N2 nanoparticles was evaluated by the rotational hysteresis loss obtained from magnetic torque measurements. The saturation magnetization of the α”-Fe16N2 core was deduced from volume fractions of α”-Fe16N2 determined by an analysis of a low-temperature Mossbauer spectrum. The saturation magnetization and the anisotropy energy were found to be 234 emu/cc and 6.9 Merg/cm3, respectively. These values coincide with those of bulk-like single-phase α”-Fe16N2 particles. This crystalline anisotropy is still smaller than the shape anisotropy of the thin films (2πMs2=20Merg/cm3), and a perpendicular magnetic state is not expected for the thin-film form

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