Segulkerfi á ýmsum lengdar og tímaskölum: Frá atómum til spunaíss - verkefni lokið

Fréttatilkynning verkefnisstjóra


         The project involved the development of theoretical and computational methods for identifying the mechanism and estimating the rate of magnetic transitions that occur because of thermal fluctuations possibly in the presence of an external field. 

The focus was on localized, non-collinear magnetic structures, in particular skyrmions but also vortices, as they are andidates for future data storage and data processing. With such technology, higher storage density by orders of magnitude could be achieved and lower energy consumption. The challenge there is mainly to find materials and design systems where the localized magnetic states are stable enough at room temperature. In the project, the tools have been developed to estimate lifetime of such states and the first calculation of the activation energy for collapse carried out (article 1). Furthermore, a particular system that had been measured by experiments was estimated and the path and activation energy for collapse estimated (article 5). The articles describing this work have already had significant impact, with 105 and 70 citations, respectively. The remagnetization of small magnetic islands was also analyzed both theoretically and with calculations mimicking particular systems that had been measured in the laboratory. Experimental measurements and theoretical calculations were carried out for spin ice systems, in particular kagome and shakty lattices. Some of those articles were published in very high impact journals (in particular article 14). Some of the work was carried out as part of a Nordic Network organized by the PI. The simulation methods developed in he project have been implemented in various software packages such as Spirit and LAMMPS, and thereby made available to the scientific community. The outputs of the project are the publications listed above, research presentations at conferences and workshops, and the implementation of the methods in various software packages as described in the previous paragraph.

Heiti verkefnis: Segulkerfi á ýmsum lengdar og tímaskölum: Frá atómum til spunaíss/Magnetic systems on various length and time scales: From atoms to spin ice
: Hannes Jónsson, Háskóla Íslands
Tegund styrks: Verkefnisstyrkur
Styrktímabil: 2015-2017
Fjárhæð styrks: 36 millj. kr. alls
Tilvísunarnúmer Rannís: 152483

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