A MEAN-FIELD APPROACH TO A DISCRETE DIPOLAR SPIN MODEL WITH UNIAXIAL MAGNETIC ANISOTROPY

Yusuke Tomita (), Shunsuke Yanai and Hajime Takayama
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Yusuke Tomita: Institute for Solid State Physics, University of Tokyo, Kashiwa-no-ha 5-1-5, Kashiwa, Chiba 277-8581, Japan
Shunsuke Yanai: Institute for Solid State Physics, University of Tokyo, Kashiwa-no-ha 5-1-5, Kashiwa, Chiba 277-8581, Japan
Hajime Takayama: Institute for Solid State Physics, University of Tokyo, Kashiwa-no-ha 5-1-5, Kashiwa, Chiba 277-8581, Japan

International Journal of Modern Physics C (IJMPC), 2009, vol. 20, issue 09, 1335-1343

Abstract: Using the mean-field approximation, we study the reorientation transition in a discrete dipolar spin model. We array thed-dimensional spins in thed-1-dimensional hypercubic lattice points, and apply the magnetic anisotropy in thedth direction. Even though the long-range dipolar interaction is truncated to the nearest-neighbor interaction, the model exhibits the reorientation transition. The effects of the exchange interaction on the dipolar system are also studied.

Keywords: Dipolar lattice; reorientation transition; mean-field theory; critical phenomena; 11.25.Hf; 123.1K (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0129183109014400

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