Using graphene to control magnetic anisotropy and interaction between supported clusters
2015 (English)In: New Journal of Physics, ISSN 1367-2630, Vol. 17, 053052Article in journal (Refereed) Published
Stabilization of magnetic order in clusters/nanoparticles at elevated temperatures is a fundamentallychallenging problem. The magnetic anisotropy energy (MAE) that prevents the thermal fluctuationsof the magnetization direction can be around 1–10Kin free transition metal clusters of around adozen atoms. Here we demonstrate that a graphene support can lead to an order of magnitudeenhancement in the anisotropy of supported species. Our studies show that theMAEof supportedCo5 and Co13 clusters on graphene increase by factors of 2.6 and 25, respectively. The enhancement islinked to the splitting of selected electronic orbitals that leads to the different orbital contributionsalong the easy and hard axis. The conductive support enables a magnetic interaction between thedeposited species and the nature of themagnetic interaction can be controlled by the separation betweensupported clusters or by vacancies offering an unprecedented ability to tune characteristics of assemblies.
Place, publisher, year, edition, pages
2015. Vol. 17, 053052
Condensed Matter Physics
Research subject Physics, Condensed Matter Physics
IdentifiersURN: urn:nbn:se:lnu:diva-44616DOI: 10.1088/1367-2630/17/5/053052OAI: oai:DiVA.org:lnu-44616DiVA: diva2:822425