Apparent ferromagnetism in the 'pinwheel' artificial spin ice

Macêdo, R. , Macauley, G.M. , Nascimento, F.S. and Stamps, R.L. (2018) Apparent ferromagnetism in the 'pinwheel' artificial spin ice. Physical Review B, 98, 014437. (doi:10.1103/PhysRevB.98.014437)

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Abstract

Magnetic artificial spin ice provides examples of how competing interactions between magnetic nanoelements can lead to a range of fascinating and unusual phenomena. We examine theoretically a class of spin ice tilings, called pinwheel, for which near degeneracy of spin configuration energies can be achieved. The pinwheel tiling is a simple but crucial variant on the square ice geometry, in which each nanoelement of square ice is rotated some angle about its midpoint. Surprisingly, this rotation leads to an intriguing phase transition; and even though the spins are not parallel to one another, a ferromagnetic phase is found for rotation angles near 45∘. Here, magnetic domains and domain walls are found when viewed in terms of net magnetisation. Moreover, the ferromagnetic behaviour of the system depends on its anisotropy which we can control by array shape and size.

Item Type:Articles
Additional Information:This work was also supported by the University of Glasgow. The work of G.M.M. was also supported by the Carnegie Trust for the Universities of Scotland. R.L.S. also received partial support from the University of Manitoba.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Nascimento, Mr Fabio and Macauley, Mr Gavin and Stamps, Professor Robert and Macedo, Dr Rair
Authors: Macêdo, R., Macauley, G.M., Nascimento, F.S., and Stamps, R.L.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
629961Artificial spin ice: designer matter far from equilibriumRobert StampsEngineering and Physical Sciences Research Council (EPSRC)EP/L002922/1S&E P&A - PHYSICS & ASTRONOMY