| Autor: |
M. Kurfiß, R. Anton, J. Kötzler, Guido Meier, F. Schultz, L. von Sawilski |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
Journal of Magnetism and Magnetic Materials. :591-594 |
| ISSN: |
0304-8853 |
| DOI: |
10.1016/j.jmmm.2004.11.272 |
| Popis: |
By co-evaporation of Ni and an alloy of Mn and In, thin films of the Heusler alloy Ni 2 MnIn are deposited at temperatures around 300 ∘ C. Electron diffraction reveals the L 2 1 -ordered cubic structure (Fm3m). Magnetization data shows an onset of ferromagnetism at 318 K in close agreement with previous results on bulk Ni 2 MnIn , while the saturation magnetization appears to be 15% below the bulk value. The field-dependent and the zero-field-cooled magnetizations indicate superparamagnetism, which can be related to the granular nanostructure of the films. A particle size of 23 nm is extracted, which is in the order of the film thickness (39 nm) and agrees with a mean grain size of (25 ± 5) nm observed by transmission electron microscopy. The magnetic blocking at T bl = 280 K is attributed to the strong dipole interaction between the grains. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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