Analysis of ultra-narrow ferromagnetic domain walls
Name
56028361-MIT.pdf
Description
Full printable version
Size
2.31 MB
Format
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Checksum (MD5)
d68db6c15623e17fdb627c10f684e563
Author(s)
Jenkins, Catherine A. (Catherine Ann), 1981-
Advisor(s)
David I. Paul and Samuel M. Allen.
Date Issued
2004
Publisher
Massachusetts Institute of Technology
Abstract
A mathematical analysis of ultra-narrow ferromagnetic domain walls was undertaken, with graphical plots coded in the programming language TrueBASIC. An intrinsic inter-atomic potential stemming from the breakdown of the continuum approximation of matter is calculated and its contribution to the coercive force of hard materials is depicted. The interaction of a very narrow domain wall with a similarly narrow planar defect is analyzed. Time-dependent motion of such walls is modeled for various external driving forces and in different combinations of material parameters. This work was completed in parallel with a study of narrow crystallographic magnetic discontinuities known as twin boundaries, and was designed to gain an intuition into the control of high-anisotropy magnetic recording devices. The equations developed here would be particularly useful as a basis for approaching the calculations of the stability of high-density storage media.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2004.
Includes bibliographical references (p. 35).
Subjects
Materials Science and Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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