Models of the energy landscape for an element of shakti spin ice

U. B. Arnalds, S. Y. Liashko, P. F. Bessarab, V. M. Uzdin*, H. Jonsson

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Micromagnetic calculations are compared with faster model calculations of interacting nanoscopic magnetic islands representing an element of a shakti spin ice lattice. Several pathways for transitions between equivalent ground states are studied. The model calculations describe the interaction between the islands either with the point dipole approximation, or with a dumbbell approximation where the distance between the two poles is optimized to match the micromagnetic results. The closest agreement in the energy of both local minima as well as transition state configurations where one macrospin has rotated by 90 degrees is obtained with a dumbbell model where the distance between the poles is ca. 20 % smaller than the island length.

Original languageEnglish
Pages (from-to)711-715
Number of pages5
JournalNanosystems: Physics, Chemistry, Mathematics
Volume9
Issue number6
DOIs
Publication statusPublished - Dec 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • magnetic islands
  • activation energy
  • micromagnetics
  • dipole interaction
  • dumbbell
  • spin ice
  • LATTICE
  • FIELD

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