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Realization of ground state in artificial kagome spin ice via topological defect-driven magnetic writing

DOI: 10.1038/s41565-017-0002-1 DOI Help

Authors: Jack C. Gartside (Imperial College London) , Daan M. Arroo (Imperial College London) , David M. Burn (Diamond Light Source) , Victoria L. Bemmer (Imperial College London) , Andy Moskalenko (Imperial College London) , Lesley F. Cohen (Imperial College London) , Will R. Branford (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Nanotechnology , VOL 57

State: Published (Approved)
Published: November 2017

Abstract: Arrays of non-interacting nanomagnets are widespread in data storage and processing. As current technologies approach fundamental limits on size and thermal stability, enhancing functionality through embracing the strong interactions present at high array densities becomes attractive. In this respect, artificial spin ices are geometrically frustrated magnetic metamaterials that offer vast untapped potential due to their unique microstate landscapes, with intriguing prospects in applications from reconfigurable logic to magnonic devices or hardware neural networks. However, progress in such systems is impeded by the inability to access more than a fraction of the total microstate space. Here, we demonstrate that topological defect-driven magnetic writing—a scanning probe technique—provides access to all of the possible microstates in artificial spin ices and related arrays of nanomagnets. We create previously elusive configurations such as the spin-crystal ground state of artificial kagome dipolar spin ices and high-energy, low-entropy ‘monopole-chain’ states that exhibit negative effective temperatures.

Journal Keywords: Magnetic devices; Magnetic properties and materials; Surface patterning; Surfaces, interfaces and thin films; Techniques and instrumentation

Diamond Keywords: Data Storage

Subject Areas: Physics, Materials, Information and Communication Technology

Technical Areas:

Added On: 28/11/2017 10:24

Discipline Tags:

Quantum Materials Physics Electronics Components & Micro-systems Information & Communication Technologies Magnetism Materials Science

Technical Tags: