TITLE

Magnetic domain structure in a ferromagnetic shape memory alloy Ni[sub 51]Fe[sub 22]Ga[sub 27] studied by electron holography and Lorentz microscopy

AUTHOR(S)
Murakami, Y.; Shindo, D.; Oikawa, K.; Kainuma, R.; Ishida, K.
PUB. DATE
May 2003
SOURCE
Applied Physics Letters;5/26/2003, Vol. 82 Issue 21, p3695
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Behaviors of magnetic domains with cooling in a Ni[sub 51]Fe[sub 22]Ga[sub 27] ferromagnetic shape memory alloy were examined by electron holography and Lorentz microscopy. A peculiar meshy pattern was observed in the Lorentz microscope image of the parent phase, being concurrent with the anomaly in the thermomagnetization curve. The meshy pattern was found to stem from the heavily bent lines of magnetic flux. The dramatic change in the magnetic domains is presumably due to some intrinsic magnetic instability that is pronounced by cooling, rather than a phenomenon triggered by the lattice modulation as the precursor effect of martensitic transformations or formation of the intermediate phase as observed in other systems.
ACCESSION #
9815551

 

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