Chirality control and magnetization dynamics in a dual vortex spin valve nanopillar

Simple item page
dc.contributor.authorKolthammer, Joseph Edward
dc.contributor.supervisorChoi, Byoung-Chul
dc.date.accessioned2017-05-01T14:31:28Z
dc.date.available2017-05-01T14:31:28Z
dc.date.copyright2017en_US
dc.date.issued2017-05-01
dc.degree.departmentDepartment of Physics and Astronomy
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractA new method for dynamic chirality control of a magnetic vortex is demonstrated with micromagnetic simulations. Spin transfer torque and giant magnetoresistance in an asymmetric spin valve nanopillar provide fast, reliable, and compact single-bit manipulation and readout. Magnetization relaxation following chirality switching proceeds via formation and dissipation of spin wave eigenmodes. Combined time- and frequency-domain analysis reveals a novel radial eigenmode spectrum with large edge amplitudes and nonuniform phase in the fundamental mode, in contrast with existing analytical models and experimental precedents. With the aim to determine the sources of this departure, we implement signal processing methods to identify and characterize the effects of interlayer coupling and nanoscale spatial confinement on the magnetization dynamics. Variation of the interlayer coupling and relative chirality is found to modify the eigenfrequencies but not the eigenfunctions. Examination of the interlayer phase and dynamic stray field provides quantitative and qualitative explanation of frequency splitting with relative chirality.en_US
dc.description.proquestcode0611, 0607en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/8022
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectnanomagnetismen_US
dc.subjectsimulationen_US
dc.subjectvortexen_US
dc.titleChirality control and magnetization dynamics in a dual vortex spin valve nanopillaren_US
dc.typeThesisen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Kolthammer_Joseph_PhD_2017.pdf
Size:
5.28 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.74 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Electronic Theses and Dissertations (ETD)
 
University of Victoria Libraries

We acknowledge and respect the Lək̓ʷəŋən (Songhees and Esquimalt) Peoples on whose territory the university stands, and the Lək̓ʷəŋən and W̱SÁNEĆ Peoples whose historical relationships with the land continue to this day.