Multipolar ordering and magnetization reversal in two-dimensional nanomagnet arrays

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 in...

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Bibliographic Details
Published inPhysical review letters Vol. 95; no. 20; p. 207202
Main Authors Vedmedenko, E Y, Mikuszeit, N, Oepen, H P, Wiesendanger, R
Format Journal Article
LanguageEnglish
Published United States 11.11.2005
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Summary: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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.95.207202