Ordering of magnetic nanoparticles in bilayer structures

Xi, Hongwei; Wang, Xiaobin; Chen, Yiran; Ryan, Pat J.

doi:10.1088/0022-3727/42/1/015006

Cited by 2 publications

(1 citation statement)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…and even nanoparticles are arranged in a 2D lattice on a bacterial surface [3]. Thus, numerical simulations are carried out in systems composed of small magnetic particles regularly placed on stacked layers [4,5], which can be considered as Q2D crystal arrays of magnetic dipoles. The magnetic dipolar interaction in such systems has been treated following different approaches [1,2,[4][5][6][7], but a consistent Q2D theory is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Dipolar local field in homogeneously magnetized quasi-two-dimensional crystals

León¹,

Estévez-Rams²

2009

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A formalism to calculate the dipolar local field in homogeneously magnetized quasi-two-dimensional (Q2D) crystals is comprehensively presented. Two fundamental tests for this formalism are accomplished: the transition from the Q2D quantities to the corresponding 3D ones; and the recovering of the macroscopic quantities of the 3D continuum theory. The additive separation between lattice and shape contributions to the local field allows an unambiguous interpretation of the respective effects. Calculated demagnetization tensors for square and circular lateral geometries of dipole layers show that for a single crystal layer an extremely thin film, but still with a finite thickness, is a better physical representation than a strictly 2D plane. Distinct close-packed structures are simulated and calculations of the local field at the nodes of the stacked 2D lattices allow one to establish the number of significantly coupled dipole layers, depending on the ratio between the interlayer distance and the 2D lattice constant. The conclusions drawn are of interest for the study of the dipolar interaction in magnetic ultrathin films and other nanostructured materials, where magnetic nanoparticles are embedded in non-magnetic matrices.

show abstract