Influence of Longitudinal External Magnetic Field on Microstructures of Monolayers Composed of Ferromagnetic Nanoparticles

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  • 強磁性ナノ粒子からなる単層膜のミクロ構造に対する垂直外部磁場の影響
  • 強磁性ナノ粒子からなる単層膜のミクロ構造に対する垂直外部磁場の影響--擬2次元モンテカルロ・シミュレーションを用いた解析
  • キョウジセイ ナノ リュウシ カラ ナル タンソウマク ノ ミクロ コウゾウ ニ タイスル スイチョク ガイブ ジバ ノ エイキョウ ギ2ジゲン モンテ カルロ シミュレーション オ モチイタ カイセキ
  • 擬2次元モンテカルロ・シミュレーションを用いた解析
  • Analysis by Means of Quasi-Two-Dimensional Monte Carlo Simulation

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Abstract

We have investigated the influences of longitudinal external magnetic field strength and area fraction of particles on microstructures of quasi-two-dimensional monolayers composed of ferromagnetic nanoparticles by means of Monte Carlo simulation. The microstructures of the monolayers obtained in simulations were analyzed in terms of the radial distribution and orientational distribution functions. The results obtained are summarized as follows. For a small area fraction of particles, the formation of a chain-like structure is prevented by the orientation of the magnetic moment in the direction of the magnetic field, so that a gas-like microstructure appears for a sufficiently strong magnetic field. For a large area fraction of particles, the chain-like structures are still formed even when a relatively strong magnetic field is applied. For a very strong magnetic field, a liquid-like microstructure appears, and the chain-like structures disappear.

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