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Magnetic and Structural Properties of Rapidly Quenched Tetragonal Mn3 - xGa Nanostructures.
- Source :
- IEEE Transactions on Magnetics; Jul2013, Vol. 49 Issue 7, p3277-3280, 4p
- Publication Year :
- 2013
-
Abstract
- Nanostructured Mn3 - x Ga ribbons with x = 0, 0.4, 0.9 and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal D019 and cubic L21 Heusler crystal structures based on the concentration of Mn in Mn3 - xGa. Upon vacuum-annealing the samples at 450 ^\circC for about 50 hours, both the hexagonal and cubic structures transformed into a tetragonal D022 structure. High-temperature x-ray diffraction and high-temperature magnetometry showed that the samples with low Mn content (Mn1.9 Ga and Mn2.1Ga) retain their tetragonal structure up to 850 K but the samples with high Mn concentrations (Mn2.6 Ga and Mn3.0Ga) undergo a structural phase transition from tetragonal to hexagonal phases around 800 K. The magnetic properties of Mn3 - x Ga ribbons were very sensitive to Mn concentration, where the magnetization and anisotropy energy increased and the coercivity decreased as x increased from 0 to 1.1. Although the Curie temperatures of Mn2.6 Ga and Mn3.0 Ga samples could not be determined because of the structural phase transition, the Curie temperature decreased with increasing x in Mn3 - xGa. The maximum magnetization of 57 emu/g (300 emu/cm^3) and the coercivity of 6.5 kOe were measured in the Mn1.9 Ga and Mn3.0Ga ribbons, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189464
- Volume :
- 49
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Magnetics
- Publication Type :
- Academic Journal
- Accession number :
- 89227751
- Full Text :
- https://doi.org/10.1109/TMAG.2013.2244856