Characterization of Three-Dimensional Magnetic Alignment for Magnetically Biaxial Particles
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概要
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The three-dimensional magnetic alignment (3DMA) is analytically investigated for magnetically biaxial particles with the susceptibility \chi_{1}>\chi_{2}>\chi_{3} in an amplitude-modulated (AM) elliptic field \mathbf{B}= \mathbf{i}_{1}Bb_{1}\cos\omega t + \mathbf{i}_{2}Bb_{2}\sin\omega t as a prototype method for 3DMA. The distribution function and the biaxial ordering matrix are numerically calculated by the Boltzmann distribution and the rotational diffusion equation. The 3DMA attains the optimum performance in the rapid rotation regime (RRR) with the infinity rotation frequency \omega while the RRR is effectively available at lower rotation frequencies. The intermediate magnetization axis \chi_{2} is inferior to the easy and hard magnetization axes \chi_{1} and \chi_{3} in the time development and the equilibrium state of alignment. In all the methods for 3DMA, the dynamic and equilibrium behavior in the RRR are universally characterized by the reduced energy \alpha = V(Bb_{1})^{2}(\chi_{3} - \chi_{1})/(2\mu_{0}k_{\text{B}}T), the biaxial deviation of susceptibility k = (\chi_{2}-\chi_{1})/(\chi_{3}-\chi_{1}), the field modulation factor q = (b_{2}/b_{1})^{2}, and the reduced time t_{\text{r}} = | \alpha | Dt where D is the rotational diffusion constant.
- 2013-01-25
著者
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Yamamoto Isao
Department Of Electronic Engineering Faculty Of Engineering Okayama University Of Science
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Ozawa Shun
Department Of Internal Medicine.funabashi Municipal Medical Center
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Yamaguchi Masuhiro
Department Of Applied Physics Faculty Of Science Tokyo Institute Of Technology
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Kimura Tsunehisa
Division of Forest and Biomaterials Science, Kyoto University, Kyoto 606-8502, Japan
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Kimura Tsunehisa
Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
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Ozawa Shun
Department of Physics, Yokohama National University, Yokohama 240-8501, Japan
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Yamaguchi Masuhiro
Department of Physics, Yokohama National University, Yokohama 240-8501, Japan
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