In-situ Lorentz TEM Cooling Study of Magnetic Domain Configurations in Ni2MnGa

Abstract

Magnetic domain configurations in the ferromagnetic shape memory alloy Ni(2)MnGa are analyzed by means of Lorentz microscopy and noninterferometric phase reconstruction methods. Domain structures in the cubic phase consist of cross-tie walls in the thinnest portions of the foil, and more complex configurations in thicker regions. At low temperature, the magnetization configurations change as the structure transforms martensitically to a tetragonal phase. A simple model for the magnetization changes is proposed.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2001
Accession Number
ADA516280

Entities

People

  • Marc De Graef
  • Matthew A. Willard
  • Michael E. Mchenry
  • Yimei Zhu

Organizations

  • Carnegie Mellon University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Alloys
  • Boundaries
  • Crystallography
  • Domain Walls
  • Electronic Mail
  • Field Emission
  • Low Temperature
  • Magnetic Domains
  • Magnetic Materials
  • Magnetization
  • Martensite
  • Materials
  • Materials Science
  • Neutron Diffraction
  • Phase Transformations
  • Shape
  • Shape Memory Alloys

Fields of Study

  • Physics

Readers

  • Marine Propulsion Engineering and Naval Architecture
  • Materials Science and Engineering.
  • Plasma Physics / Magnetohydrodynamics