Magnetotransport of connected artificial spin ice

Artificial spin ices are mesoscopic arrays of interacting single-domain ferromagnetic nanoislands or nanowires. With Ising-like behavior of individual magnetic moments, artificial spin ice has been utilized to investigate geometrically frustrated systems like spin ice, a class of magnetic pyrochlore oxides. Here I detail measurements of the magnetotransport response of connected artificial spin ice to varying temperatures and magnetic fields. In the literature, transport measurements have been used simply as a tool to probe the behavior of connected artificial spin ice. Here I demonstrate that connected artificial spin ice possesses fascinating intrinsic magnetotransport properties. I describe first the interplay between artificial spin ice transport and another magnetic phenomenon, exchange bias. Afterwards, I detail systematic transport measurements for different magnetic field directions, revealing that the vertices of connected artificial spin ice control facets of the transport features.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2016

Author dc:creator

• Le, Brian Lamson

Contributors dc:contributor

• Schiffer, Peter E.
• Mason, Nadya
• DeMarco, Brian L.
• Vishveshwara, Smitha

• artificial spin ice
• frustrated magnetism
• magnetotransport
• exchange bias
• anisotropic magnetoresistance
• planar Hall effect

Statement dc:rights

• Copyright 2016 by Brian L. Le

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/90524

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/90524