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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2018-12
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Mcode
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Language
en
Pages
5
711-715
Series
Nanosystems: Physics, Chemistry, Mathematics, Volume 9, issue 6
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.
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Keywords
magnetic islands, activation energy, micromagnetics, dipole interaction, dumbbell, spin ice, LATTICE, FIELD
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Citation
Arnalds , U B , Liashko , S Y , Bessarab , P F , Uzdin , V M & Jonsson , H 2018 , ' Models of the energy landscape for an element of shakti spin ice ' , Nanosystems: Physics, Chemistry, Mathematics , vol. 9 , no. 6 , pp. 711-715 . https://doi.org/10.17586/2220-8054-2018-9-6-711-715