TITLE

Stress-induced magnetization in polycrystalline Ni–Fe–Ga ferromagnetic shape memory alloy

AUTHOR(S)
Kustov, Sergey; Corró, Miquel; Cesari, Eduard
PUB. DATE
October 2007
SOURCE
Applied Physics Letters;10/1/2007, Vol. 91 Issue 14, p141907
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Results are reported for simultaneous experimental studies of the stress-induced magnetic induction and of anelasticity in a polycrystalline Ni–Fe–Ga ferromagnetic shape memory alloy. The authors found in the martensitic state a linear relationship between mechanically induced induction and stress amplitude, in contrast to a strong nonlinearity of the anelastic strain. This difference between elastic and magnetic responses to applied stress points to inefficient coupling between the motion of elastic twins/domain boundaries and magnetic domain walls. They argue that, in acoustic experiments, magnetic domain walls in Ni–Fe–Ga polycrystals perform only linear displacements within local potential minima, characteristic for the microeddy current magnetomechanical damping.
ACCESSION #
27060970

 

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