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  4. GENERATION OF SPIN CURRENTS IN FERROMAGNETIC MATERIALS

GENERATION OF SPIN CURRENTS IN FERROMAGNETIC MATERIALS

File(s)
Mittelstaedt_cornellgrad_0058F_13108.pdf (3.16 MB)
Permanent Link(s)
https://doi.org/10.7298/21c2-2m67
https://hdl.handle.net/1813/112013
Collections
Cornell Theses and Dissertations
Author
Mittelstaedt, Joseph Arthur
Abstract

This thesis will discuss the utilization of ferromagnets for the generation of spin currents via various spin Hall like effects. The global magnetic order in a ferromagnetic material breaks the requisite symmetries to allow for the generation of spin currents with arbitrary polarizations which could prove useful for magnetic information storage technology. We first discuss some of the theoretical background of the various microscopic origins which can lead to spin Hall currents in ferromagnets as well as the theory behind some of the the experimental techniques used in this thesis. We then describe the measurement of a non-reorientable component of the spin Hall effect generated by a ferromagnetic Ni-Fe alloy using the spin torque ferromagnetic resonance technique, as well as modifications that we needed to make to the analysis of these measurements to account for coupling between magnetic layers driven by dynamic spin pumping. We conclude with a discussion of the materials problems which must be solved to utilize the spin anomalous Hall effect to switch out-of-plane polarized ferromagnetic layers as well as our attempts to realize such material systems.

Description
147 pages
Date Issued
2022-08
Keywords
Ferromagnet
•
Ferromangetic Resonance
•
Hall
•
Spintronics
Committee Chair
Ralph, Dan
Committee Member
Nowack, Katja C.
Mueller, Erich
Degree Discipline
Physics
Degree Name
Ph. D., Physics
Degree Level
Doctor of Philosophy
Rights
Attribution 4.0 International
Rights URI
https://creativecommons.org/licenses/by/4.0/
Type
dissertation or thesis
Link(s) to Catalog Record
https://newcatalog.library.cornell.edu/catalog/15578825

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