Szczegóły publikacji
Opis bibliograficzny
Spin-transfer-driven oscillations of the magnetic quasi-vortex in a dot with crystalline cubic anisotropy / Andrzej Janutka, Przemysław GAWROŃSKI // Journal of Physics. D, Applied Physics ; ISSN 0022-3727. — 2017 — vol. 50 no. 14 art. no. 145003, s. 1–12. — Bibliogr. s. 11-12, Abstr.
Autorzy (2)
- Janutka Andrzej
- AGHGawroński Przemysław
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 111315 |
|---|---|
| Data dodania do BaDAP | 2018-01-11 |
| Tekst źródłowy | URL |
| DOI | 10.1088/1361-6463/aa5e84 |
| Rok publikacji | 2017 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Physics, D, Applied Physics |
Abstract
We study the oscillatory magnetization dynamics of a vortex-containing nanodot driven by an out-of-plane polarized electric current. The dot is an ultra-thin structure (of a thickness up to the magnetostatic exchange length, a nanodisc) created from a material with strong crystalline cubic anisotropy. Therefore, it is in-plane ordered, with an effective four-fold anisotropy. Provided that the dot diameter is sufficiently large compared to the crystalline anisotropy exchange length, a vortex-centered texture that consists of four closure domains and pi/2 domain walls (DWs) is stable. We call such a texture a quasi-vortex. Under the out-of-plane polarized spin current, in a certain range of the current density, the quasi-vortex rotates without any displacement of its center or damage to its core via movement of the pi/2 DWs. The DW motion is accompanied by cyclic deformations and significant oscillations of the out-of-plane component of the magnetization. We discuss the potential of the quasi-vortex-containing dot to serve as a free layer of a spin-transfer oscillator and suggest that it shows promise for improving the efficiency and/or simplicity of signal conversion relative to the usual spin-transfer vortex oscillators with a soft-magnetic free layer.
