Details
| Original language | English |
|---|---|
| Pages (from-to) | 891-896 |
| Number of pages | 6 |
| Journal | Advanced functional materials |
| Volume | 21 |
| Issue number | 5 |
| Publication status | Published - 8 Feb 2011 |
| Externally published | Yes |
Abstract
Magnetic vortices show promise as data storage structures, however the vortex formation process imposes a lower limit on the elements size. In this article a technique is presented, which application increases the probability of nucleating of magnetic vortices in sub-micrometer sized soft magnetic thin film elements. By tailoring the edge geometry of the elements, the symmetry of their magnetic configuration is broken in a manner which favors vortex nucleation. Micromagnetic simulations are presented, which demonstrate this effect in soft-magnetic disks with beveled edges. The favored edge geometry is realized by applying nanosphere lithography directly on top of a ferromagnetic thin film material. In this process, the film is masked with a self assembled monolayer of SiO2-nanospheres and subsequently ion-etched. The resulting magnetic reversal loops show that in both magnetically isolated as well as in closely packed arrays of beveled disks, vortex formation takes place. The technique presented facilitates the vortex formation even in closely packed and small elements. The lowering of the minimum critical diameter for vortex formation enables a significant increase of data storage density in devices based on magnetic vortices.
Keywords
- magnetic materials, magnetic vortex, nanoparticles, patterned arrays, thin films
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Advanced functional materials, Vol. 21, No. 5, 08.02.2011, p. 891-896.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Enhanced Nucleation of Vortices in Soft Magnetic Materials Prepared by Silica Nanosphere Lithography
AU - Martin, Norbert
AU - Bigall, Nadja Carola
AU - Mönch, Ingolf
AU - Gemming, Thomas
AU - Eychmüller, Alexander
AU - Mattheis, Roland
AU - Schäfer, Rudolf
AU - Schultz, Ludwig
AU - Mccord, Jeffrey
PY - 2011/2/8
Y1 - 2011/2/8
N2 - Magnetic vortices show promise as data storage structures, however the vortex formation process imposes a lower limit on the elements size. In this article a technique is presented, which application increases the probability of nucleating of magnetic vortices in sub-micrometer sized soft magnetic thin film elements. By tailoring the edge geometry of the elements, the symmetry of their magnetic configuration is broken in a manner which favors vortex nucleation. Micromagnetic simulations are presented, which demonstrate this effect in soft-magnetic disks with beveled edges. The favored edge geometry is realized by applying nanosphere lithography directly on top of a ferromagnetic thin film material. In this process, the film is masked with a self assembled monolayer of SiO2-nanospheres and subsequently ion-etched. The resulting magnetic reversal loops show that in both magnetically isolated as well as in closely packed arrays of beveled disks, vortex formation takes place. The technique presented facilitates the vortex formation even in closely packed and small elements. The lowering of the minimum critical diameter for vortex formation enables a significant increase of data storage density in devices based on magnetic vortices.
AB - Magnetic vortices show promise as data storage structures, however the vortex formation process imposes a lower limit on the elements size. In this article a technique is presented, which application increases the probability of nucleating of magnetic vortices in sub-micrometer sized soft magnetic thin film elements. By tailoring the edge geometry of the elements, the symmetry of their magnetic configuration is broken in a manner which favors vortex nucleation. Micromagnetic simulations are presented, which demonstrate this effect in soft-magnetic disks with beveled edges. The favored edge geometry is realized by applying nanosphere lithography directly on top of a ferromagnetic thin film material. In this process, the film is masked with a self assembled monolayer of SiO2-nanospheres and subsequently ion-etched. The resulting magnetic reversal loops show that in both magnetically isolated as well as in closely packed arrays of beveled disks, vortex formation takes place. The technique presented facilitates the vortex formation even in closely packed and small elements. The lowering of the minimum critical diameter for vortex formation enables a significant increase of data storage density in devices based on magnetic vortices.
KW - magnetic materials
KW - magnetic vortex
KW - nanoparticles
KW - patterned arrays
KW - thin films
UR - http://www.scopus.com/inward/record.url?scp=79952163510&partnerID=8YFLogxK
U2 - 10.1002/adfm.201002140
DO - 10.1002/adfm.201002140
M3 - Article
AN - SCOPUS:79952163510
VL - 21
SP - 891
EP - 896
JO - Advanced functional materials
JF - Advanced functional materials
SN - 1616-301X
IS - 5
ER -