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

reportActive / Technical Report | Accession Number: ADA516280 | Open PDF

Abstract:

Magnetic domain configurations in the ferromagnetic shape memory alloy Ni2MnGa 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.

Author(s):
De Graef, Marc ; Willard, Matthew A. ; Mchenry, Michael E. ; Zhu, Yimei
Author Organization(s):
CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF MATERIALS SCIENCE AND ENGINEERING
Descriptive Note:
Journal article
Supplementary Note:
Published in IEEE Transactions on Magnetics, v37 n4 p2663-2665, July 2001. Sponsored in part by NSF.
Pagination:
0004

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
DE-AC02-98CD10886, DMR-95-01017
Monitor Series:
DOE
 Subject Terms
Joint Capability Areas:
JCA_8_Building Partnerships
Communities of Interest:
Advanced Electronics
Descriptor(s):
*MAGNETIC DOMAINS, *SHAPE MEMORY ALLOYS, NICKEL ALLOYS, LORENTZ FORCE, MAGNETIC ALLOYS, ELECTRON MICROSCOPY, REPRINTS, FOILS(MATERIALS)
Field(s)/Group(s):
Metallurgy and Metallography, Electricity and Magnetism
Keyword(s):
*FERROMAGNETIC SHAPE MEMORY ALLOYS, *LORENTZ MICROSCOPY, PHASE RECONSTRUCTION, PHASE TRANSFORMATION
Report Date:
2001 Jul 01
Creation Date:
2010 Mar 31