Influence of annealing and phase decomposition on the magnetostructural transitions in Ni50Mn39Sn11
| Title | Influence of annealing and phase decomposition on the magnetostructural transitions in Ni50Mn39Sn11 |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | Yuhasz WM, Schlagel DL, Xing Q, Dennis KW, McCallum RW, Lograsso TA |
| Journal Title | Journal of Applied Physics |
| Volume | 105 |
| Pages | 07a921 |
| Date Published | 04/01 |
| ISBN Number | 0021-8979 |
| Accession Number | ISI:000266633500246 |
| Keywords | magnetic-properties, ni-mn-ga, shape-memory alloys, transformations |
| Abstract | Magnetic and structural transitions in the Ni50Mn50-xSnx (x=10-25) ferromagnetic shape memory alloys are currently of interest. As in Ni-Mn-Ga, these alloys feature high-temperature austenite and low-temperature martensite phases, where the magnetic state is strongly composition dependent. To study the role of chemical ordering in fine-tuning their magnetostructural properties, they were first annealed for 4 weeks/1223 K to achieve structural and compositional homogeneity, and were then further annealed for 1 week (similar to 150 K below the reported B2 to L2(1) transition) at 773 K to increase the degree of chemical ordering. For x=11, this anneal resulted in a dramatic change in the magnetic ordering temperature. Following the 1223 K anneal, the sample exhibited ferromagnetic ordering at 140 K. After the 773 K anneal, the ferromagnetic transition is at 350 K, a characteristic of the ferromagnetic austenite phase with 15 |
| URL | <Go to ISI>://000266633500246 |
| DOI | 10.1063/1.3067855 |
