Change search
ReferencesLink to record
Permanent link

Direct link
Arrays of elliptical Fe(001) nanoparticles: Magnetization reversal, dipolar interactions, and effects of finite array sizes
Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Molecular Biomimetics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden.;Univ Warsaw, Ctr New Technol, PL-02097 Warsaw, Poland..
Univ Gothenburg, Dept Phys, SE-41296 Gothenburg, Sweden..
Show others and affiliations
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 9, 094436Article in journal (Refereed) Published
Abstract [en]

The magnetic properties of arrays of nanoparticles are determined by the interplay between the individual particle properties and the dipolar interactions between them. Here we present a study of arrays of elliptical Fe(001) particles of thickness 10-50 nm. The aspect ratios of the ellipses are 1:3, their short axes a = 50, 100, or 150 nm, and the periodicity of the rectangular arrays is either two or four times the corresponding axes of the ellipses. Magnetic measurements together with numerical and micromagnetic calculations yield a consistent picture of the arrays, comprising single-domain nanoparticles. We show that the magnetization reversal, occurring in the range 100-400 mT for fields applied along the long axis, is mainly determined by the properties of the corresponding single Fe ellipses. The interaction fields of the order of tens of mT can be tuned by the array configurations. For the actual arrays the interactions promote switching. For film thicknesses below the Bloch wall width parameter of Fe, l(w) = 22 nm, magnetization reversal occurs without formation of domain walls or vortices. Within this range arrays may be tuned to obtain a well-defined switching field. Two general conclusions are drawn from the calculations: the character of the interaction, whether it promotes or delays magnetization reversal, is determined by the aspect ratio of the array grid, and the interaction strength saturates as the size of the array increases.

Place, publisher, year, edition, pages
2015. Vol. 92, no 9, 094436
National Category
Physical Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-264842DOI: 10.1103/PhysRevB.92.094436ISI: 000361660600002OAI: diva2:861756
Available from: 2015-10-19 Created: 2015-10-19 Last updated: 2015-10-23Bibliographically approved

Open Access in DiVA

fulltext(3766 kB)311 downloads
File information
File name FULLTEXT01.pdfFile size 3766 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Brucas, RimantasHjörvarsson, Björgvin
By organisation
Molecular BiomimeticsSolid State PhysicsMaterials Physics
In the same journal
Physical Review B. Condensed Matter and Materials Physics
Physical SciencesEngineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 311 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 1051 hits
ReferencesLink to record
Permanent link

Direct link