Magnetic Properties of Two-Dimensional Dipolar Squares : Boundary Geometry Dependence(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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By means of the molecular dynamics simulation of gradual cooling processes, we investigate magnetic properties of classical spin systems only with the magnetic dipole-dipole interaction, which we call dipolar systems. Focusing on their finite-size effect, particularly their boundary geometry dependence, we study two finite dipolar squares cut out from a square lattice with Φ=0 and π/4, where Φ is the angle between the direction of the lattice axis and that of the square boundary. Distinctly different results are obtained in the two dipolar squares. In the Φ=0 square, the "from-edge-to-interior freezing" of spins is observed. Its ground state has a multidomain structure whose domains consist of two among infinitely (continuously) degenerated Luttinger-Tisza (LT) ground-state orders on a bulk square lattice, i.e., the two antiferromagnetically aligned ferromagnetic chains (af-FMC) orders directed parallel to the two lattice axes. In the Φ=π/4 square, on the other hand, the freezing starts from the interior of the square, and its ground state is nearly in a single domain with one of the two af-FMC orders. These geometry effects are argued to originate from the anisotropic nature of the dipole-dipole interaction, which depends on the relative direction of sites in the real space of the interacting spins.
- 社団法人日本物理学会の論文
- 2007-04-15
著者
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TAKAYAMA Hajime
Institute for Solid State Physics, University of Tokyo
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TOMITA Yusuke
Institute for Solid State Physics, University of Tokyo
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Takayama Hajime
Institute For Solid State Physics University Of Tokyo
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Tomita Yusuke
Institute For Solid State Physics University Of Tokyo
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SUGANO Ryoko
Advanced Research Laboratory, Hitachi, Ltd.
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MATSUSHITA Katsuyoshi
Institute for Solid State Physics, University of Tokyo
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KURODA Akiyoshi
Institute for Solid State Physics, University of Tokyo
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Sugano Ryoko
Advanced Research Laboratory Hitachi Ltd.
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Kuroda Akiyoshi
Institute For Solid State Physics University Of Tokyo
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Tomita Yusuke
Univ. Tokyo Chiba Jpn
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Matsushita Katsuyoshi
Institute For Solid State Physics University Of Tokyo
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Takayama Hajime
Institute For Solid State Physics The University Of Tokyo
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