The potential application of artificial spin ice in magnetic nanodevices provides a strong drive to investigate different lattice geometries. Here, we combine components of a recently investigated artificial spin ratchet with components of the prototypical square lattice to form a geometrically frustrated artificial spin ice system where Ising-type nanomagnets are arranged onto a two-dimensional square-kite lattice. Using synchrotron-based photoemission electron microscopy, we explore moment configurations achieved in this lattice geometry. Following thermal annealing, we image how a variation of the relevant lattice parameter affects magnetic ordering in four-island squares and four-island vertices during cooling through the Blocking temperature. Depending on lattice spacing, both nearly uniform and disordered spin configurations are accessible in our samples. We show that the relative energies of the building blocks of the system, which are typically used to classify lattice configurations, are not predictive of the low energy states adopted by the experimental system. To understand magnetic ordering in the square-kite lattice, longer range interactions must be considered.
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26 February 2018
Research Article|
February 27 2018
Tuning magnetic ordering in a dipolar square-kite tessellation
Charlotte F. Petersen;
Charlotte F. Petersen
a)
1
COMP Centre of Excellence, Department of Applied Physics, Aalto University
, P.O. Box 11100, FI-00076 Aalto, Espoo, Finland
2
Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck
, Technikerstraße 21A, A-6020 Innsbruck, Austria
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Alan Farhan
;
Alan Farhan
b)
3
Advanced Light Source, Lawrence Berkeley National Laboratory (LBNL)
, 1 Cyclotron Road, Berkeley, California 94720, USA
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Scott Dhuey;
Scott Dhuey
4
Molecular Foundry, Lawrence Berkeley National Laboratory (LBNL)
, 1 Cyclotron Road, Berkeley, California 94720, USA
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Zuhuang Chen;
Zuhuang Chen
5
Department of Materials Science and Engineering, University of California
, Berkeley, California 94720, USA
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Mikko J. Alava;
Mikko J. Alava
1
COMP Centre of Excellence, Department of Applied Physics, Aalto University
, P.O. Box 11100, FI-00076 Aalto, Espoo, Finland
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Andreas Scholl;
Andreas Scholl
3
Advanced Light Source, Lawrence Berkeley National Laboratory (LBNL)
, 1 Cyclotron Road, Berkeley, California 94720, USA
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Sebastiaan van Dijken
Sebastiaan van Dijken
6
NanoSpin, Department of Applied Physics, Aalto University School of Science
, P.O. Box 15100, FI-00076 Aalto, Finland
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a)
Electronic mail: [email protected]
b)
Electronic mail: [email protected]
Appl. Phys. Lett. 112, 092403 (2018)
Article history
Received:
November 14 2017
Accepted:
February 11 2018
Citation
Charlotte F. Petersen, Alan Farhan, Scott Dhuey, Zuhuang Chen, Mikko J. Alava, Andreas Scholl, Sebastiaan van Dijken; Tuning magnetic ordering in a dipolar square-kite tessellation. Appl. Phys. Lett. 26 February 2018; 112 (9): 092403. https://doi.org/10.1063/1.5014041
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