Criteria for Long-Range Magnetic Order in Planar Lattices of Dipolar Coupled Magnetic Nanoparticles
✍ Scribed by Costa, M.D. ;Pogorelov, Yu.G.
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 104 KB
- Volume
- 189
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Subject classification: 75.40.Cx; 75.50.Tt; 75.75.þa The conditions are sought for the dipolar interactions in a planar lattice of separate magnetic nanogranules to bring this system from the initially frustrated ground state to a long-range ferromagnetic (FM) order. This is promoted by lowering the symmetry: either of the lattice (e.g., from square to rectangular (a > b)) for point-like or spherical granules, or of a finite-size granule (e.g., from spherical to rod-like or to disk-like) on square lattice. The FM order turns possible after some critical values of asymmetry parameters, though the system energy may behave non-analytically in these parameters. The comparison is done with the available experimental data.