Micromagnetic Modeling and its Implications for Paleointensity Studies

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  • FUKUMA Koji
    Department of Environmental Systems Science, Doshisha University

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  • マイクロ磁気モデリングの進展と古地磁気強度測定への示唆
  • マイクロ ジキ モデリング ノ シンテン ト コ チジキ キョウド ソクテイ エ ノ シサ

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Abstract

Since three-dimensional micromagnetic modeling was introduced to rock magnetism in the late 1980s, we have gained clearer perspectives beyond the classical Neel's theory. at present, we can predict the magnetic properties of even non-uniformly magnetized grains, and directly compare simulated and experimental results, which makes interpretations of measurement data much easier and more appropriate. The longstanding issue of the pseudo-single-domain can be regarded as arising from the vortex structure of magnetization based on micromagnetic modeling results. Recently, micromagnetic modelings have been applied to simulate hysteresis measurements, low-temperature magnetometry, and First-Order Reversal Curves (FORC). Calculations of demagnetizing energy are still demanding in terms of computation load, but we can obtain magnetization structures of micron-size magnetites whose Bitter patterns are observabl.e under an optical microscope. In conjunction with micromagnetic modelings, FORC methods should be useful for illustrating how seriously magnetic interaction affects paleointensity data from sediments.

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