Abstract
The minimum-energy single-domain magnetization state in a magnetized nano-ring is determined as a function of material and shape parameters. A phase diagram is derived within the framework of a Fourier-space approach for magnetic computations, showing the expected position of the ground state for any given set of external degrees of freedom. A series of micromagnetic simulations for suitably chosen parameters, show excellent agreement with the obtained theoretical results. An electron holography experiment has been carried out as a test on phase diagram reliability. The validity of the treatment, in particular the simplification employed in choosing ideal uniform rather than more physical quasi-uniform single-domain states, is thoroughly discussed in order to establish clear boundaries of applicability of the phase diagram.
Original language | English |
---|---|
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 301 |
Issue number | 1 |
Pages (from-to) | 131-146 |
Number of pages | 16 |
ISSN | 0304-8853 |
DOIs | |
Publication status | Published - 2006 |
Externally published | Yes |
Keywords
- Magnetic nano-particles
- Phase diagram
- Magnetostatic energy
- Micromagnetic simulations
- Electron holography