Metastability threshold sizes in single‐domain magnetite particles | Zendy

Shcherbakov V. P. | Zendy; Lamash B. E. | Zendy

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Metastability threshold sizes in single‐domain magnetite particles

Author(s) -

Shcherbakov V. P.,

Lamash B. E.

Publication year - 1988

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl015i005p00526

Subject(s) - metastability , magnetite , single domain , materials science , condensed matter physics , grain size , particle size , particle (ecology) , domain (mathematical analysis) , single crystal , thermodynamics , physics , magnetic domain , mathematics , chemistry , geology , magnetic field , metallurgy , nuclear magnetic resonance , mathematical analysis , magnetization , quantum mechanics , oceanography

A micromagnetic model was developed to calculate the maximum grain size for which an ideal parallelepiped‐shaped particle can have a metastable single‐domain (SD) structure. For mathematical tractability, the micromagnetic equations were described only by one‐dimensional deviations from a uniform SD state. It was found that for cubic‐shaped magnetite particles, the metastability threshold, a cr was approximately 0.14 micrometers, well above the equilibrium threshold size for the single‐domain to two‐domain transition. The metastability threshold size also increased rapidly with particle elongation and for a length:width ratio greater then 2.6, magnetite grains of all sizes could theoretically support a metastable single‐domain state.

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