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Domain wall dynamics in ion-implanted magnetic bubble materials


Gallagher, Timothy (1980) Domain wall dynamics in ion-implanted magnetic bubble materials. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/j5xa-xp25.


The object of this work is to extend the experimental and theoretical understanding of domain wall dynamics in implanted magnetic bubble materials. The presence of the implanted layer was incorporated into the theory of domain wall dynamics by considering both the modified demagnetizing field and the surface pinning associated with the implanted surface. Using this model, calculations of peak wall velocities were made to explain the velocity asymmetry with respect to in-plane field direction. An experimental technique was developed to determine the influence of implantation on bubble state switching, and the results were interpreted using the surface pinning condition. Based on predictions of the model, a new class of bubble states was found in implanted films and the unique dynamic characteristics of these states were investigated.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Humphrey, Floyd Bernard
Thesis Committee:
  • Unknown, Unknown
Defense Date:15 May 1980
Record Number:CaltechETD:etd-10172006-152737
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4134
Deposited By: Imported from ETD-db
Deposited On:31 Oct 2006
Last Modified:16 Apr 2021 23:16

Thesis Files

PDF (Gallagher_t_1980.pdf) - Final Version
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