Magnetic helices as metastable states of finite XY ferromagnetic chains: An analytical study
| Autor: | Alexander P. Popov, Maria Gloria Pini |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed matter physics Spins 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Classical XY model 01 natural sciences Electronic Optical and Magnetic Materials Magnetic field Mean field theory Ferromagnetism Metastability 0103 physical sciences 010306 general physics 0210 nano-technology Ground state Spin-½ Classical spin chain XY-model Metastable states Helical states Exchange-coupled thin films |
| Zdroj: | Journal of magnetism and magnetic materials 451 (2017): 319–326. doi:10.1016/j.jmmm.2017.11.063 info:cnr-pdr/source/autori:Alexander P. Popov (a) ; Maria Gloria Pini (b)/titolo:Magnetic helices as metastable states of finite XY ferromagnetic chains: An analytical study/doi:10.1016%2Fj.jmmm.2017.11.063/rivista:Journal of magnetism and magnetic materials/anno:2017/pagina_da:319/pagina_a:326/intervallo_pagine:319–326/volume:451 |
| DOI: | 10.1016/j.jmmm.2017.11.063 |
| Popis: | We investigated a simple but non trivial model, consisting of a chain of N classical XY spins with nearest neighbor ferromagnetic interaction, where each of the two end-point spins is assumed to be exchange-coupled to a fully-pinned fictitious spin. In the mean field approximation, the system might be representative of a soft ferromagnetic film sandwiched between two magnetically hard layers. We show that, while the ground state is ferromagnetic and collinear, the system can attain non-collinear metastable states in the form of magnetic helices. The helical solutions and their stability were studied analytically in the absence of an external magnetic field. There are four possible classes of solutions. Only one class is metastable, and its helical states contain an integer number of turns. Among the remaining unstable classes, there is a class of helices which contain an integer number of turns. Therefore, an integer number of turns in a helical configuration is a necessary, but not a sufficient, condition for metastability. These results may be useful to devise future applications of metastable magnetic helices as energy-storing elements. |
| Databáze: | OpenAIRE |
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