Magneto-structural correlations in a systematically disordered B2 lattice
| Autor: | Ehrler, Jonathan, Sanyal, Biplab, Grenzer, Jörg, Zhou, Shengqiang, Böttger, Roman, Eggert, Benedikt, Wende, Heiko, Lindner, Jürgen, Fassbender, Jürgen, Leyens, Christoph, Potzger, Kay, Bali, Rantej |
|---|---|
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | New Journal of Physics (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1367-2630/ab944a |
| Popis: | Ferromagnetism in certain B2 ordered alloys such as Fe$_{60}$Al$_{40}$ can be switched on, and tuned, via antisite disordering of the atomic arrangement. The disordering is accompanied by a $\sim$1 % increase in the lattice parameter. Here we performed a systematic disordering of B2 Fe$_{60}$Al$_{40}$ thin films, and obtained correlations between the order parameter ($S$), lattice parameter ($a_0$), and the induced saturation magnetization ($M_{s}$). As the lattice is gradually disordered, a critical point occurs at 1-$S$=0.6 and $a_0$=291 pm, where a sharp increase of the $M_{s}$ is observed. DFT calculations suggest that below the critical point the system magnetically behaves as it would still be fully ordered, whereas above, it is largely the increase of $a_0$ in the disordered state that determines the $M_{s}$. The insights obtained here can be useful for achieving tailored magnetic properties in alloys through disordering. Comment: 6 pages, 3 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|