Magnetotransport of connected artificial spin ice

Le, Brian Lamson

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https://hdl.handle.net/2142/90524 Copy

Description

Title

Magnetotransport of connected artificial spin ice

Author(s)

Le, Brian Lamson

Issue Date

2016-04-11

Director of Research (if dissertation) or Advisor (if thesis)

Schiffer, Peter E.

Doctoral Committee Chair(s)

Mason, Nadya

Committee Member(s)

• DeMarco, Brian L.
• Vishveshwara, Smitha

Department of Study

Physics

Discipline

Physics

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

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

Abstract

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.

Graduation Semester

2016-05

Type of Resource

text

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

Copyright and License Information

Copyright 2016 by Brian L. Le

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