Multipolar ordering and magnetization reversal in two-dimensional nanomagnet arrays

被引：40

作者：

Vedmedenko, EY

Mikuszeit, N

Oepen, HP

Wiesendanger, R

机构：

[1] Univ Hamburg, Inst Angew Phys, D-20355 Hamburg, Germany

[2] Univ Autonoma Madrid, E-28049 Madrid, Spain

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.95.207202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The low-temperature stable states and the magnetization reversal of realistic two-dimensional nanoarrays with higher-order magnetostatic interactions are studied theoretically. For a general calculus of the multipole-multipole interaction energy we introduce a Hamiltonian in spherical coordinates into the Monte Carlo scheme. We demonstrate that higher-order interactions considerably change the dipolar ground states of in-plane magnetized arrays favoring collinear configurations. The multipolar interactions lead to enhancement or decrease of the coercivity in arrays with in-plane or out-of-plane magnetization.

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页数：4

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