| Autor: |
Wysin GM; Department of Physics, Kansas State University, Manhattan, KS 66506-2601, USA. wysin@phys.ksu.edu, Moura-Melo WA, Mól LA, Pereira AR |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2012 Jul 25; Vol. 24 (29), pp. 296001. Date of Electronic Publication: 2012 Jun 22. |
| DOI: |
10.1088/0953-8984/24/29/296001 |
| Abstrakt: |
The energetics of thin elongated ferromagnetic nano-islands is considered for some different shapes, aspect ratios and applied magnetic field directions. These nano-island particles are important for artificial spin ice materials. For low temperature, the magnetic internal energy of an individual particle is evaluated numerically as a function of the direction of a particle's net magnetization. This leads to estimations of effective anisotropy constants for (1) the easy axis along the particle's long direction, and (2) the hard axis along the particle's thin direction. A spin relaxation algorithm together with fast Fourier transform for the demagnetization field is used to solve the micromagnetics problem for a thin system. The magnetic hysteresis is also found. The results indicate some possibilities for controlling the equilibrium and dynamics in spin ice materials by using different island geometries. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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