Abstract
By molecular dynamics simulation, we have investigated classical Heisenberg spins, which are arrayed on a finite simple cubic lattice and interact with each other only by the dipole-dipole interaction, and have found its peculiar from-edge-to-interior freezing process. As the temperature is decreased, spins on each edge predominantly start to freeze in a ferromagnetic alignment parallel to the edge around the corresponding bulk transition temperature, then from each edge grow domains with short-ranged orders similar to the corresponding bulk orders, and finally the system is expected to end up with a unique multidomain ground state at the lowest temperature. We infer that these freezing characteristics are attributed to the anisotropic and long-range nature of the dipole-dipole interaction combined with a finite-size effect.
Original language | English |
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Pages (from-to) | 2651-2654 |
Number of pages | 4 |
Journal | journal of the physical society of japan |
Volume | 74 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2005 Oct |
Externally published | Yes |
Keywords
- Magnetic dipolar system
- Magnetic domain
- Nanomagnetism
- Spin dynamics simulation
- Spin-freezing characteristics
ASJC Scopus subject areas
- Physics and Astronomy(all)