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Magnetization anomalies in melt-spun Ni–Mn–Ga ribbons
- Source :
-
Journal of Magnetism & Magnetic Materials . Mar2008, Vol. 320 Issue 6, p1063-1067. 5p. - Publication Year :
- 2008
-
Abstract
- Abstract: Temperature and field dependencies of the magnetization of melt-spun ribbons of Ni45.7Mn37.2Ga17.1 (T C<T A) and Ni54.3Mn20.5Ga25.2 (T C>T A), where T A and T C are the reverse martensitic transformation and Curie temperatures, respectively, have been studied in broad ranges of magnetic fields (±30kOe) and temperatures (10–350K). It was found that the magnetic and thermomagnetic properties have a number of peculiarities and anomalies. Particularly, the magnetization values measured at both low and high magnetic fields increase significantly after annealing. Low-temperature anomalies of magnetization suggest the presence of the superparamagnetic behavior and/or phenomena related to the concurrent exchange interactions in the as-spun state. The obtained results can be explained by the influence of concentration inhomogeneities and atomic disordering in the rapidly quenched ribbons, which can be reduced by annealing. [Copyright &y& Elsevier]
- Subjects :
- *MAGNETIZATION
*FERROMAGNETISM
*MAGNETISM
*PARAMAGNETISM
Subjects
Details
- Language :
- English
- ISSN :
- 03048853
- Volume :
- 320
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of Magnetism & Magnetic Materials
- Publication Type :
- Academic Journal
- Accession number :
- 30066489
- Full Text :
- https://doi.org/10.1016/j.jmmm.2007.10.011