Spin orbital reorientation transitions induced by magnetic field
| Autor: | Sztenkiel, Dariusz |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Magnetism and Magnetic Materials 572 (2023) 170644 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.jmmm.2023.170644 |
| Popis: | Here we report on a new effect similar to the spin reorientation transition (SRT) that takes place at two magnetic fields of $B_{SORT1}$ and $B_{SORT2}$. The effect is observed in the magnetization curves of small Mn$^{3+}$ magnetic clusters in the wurtzite GaN (being in a paramagnetic state) calculated using crystal field model approach. The obtained results suggest that the computed magnetic anisotropy (MA) reverses its sign on increasing $B$ across $B_{SORT}$. Detailed analysis show however that MA is unchanged for high magnetic fields. We show that the observed effect arises from the interplay of the crystalline environment and the spin-orbit coupling $\lambda \hat{\textbf{S}} \hat{\textbf{L}}$, therefore we name it spin orbital reorientation transition (SORT). The value of $B_{SORT1}$ depends on the crystal field model parameters and the number of ions $N$ in a given cluster, whereas $B_{SORT2}$ is controlled mostly by the magnitude of the spin-orbit coupling $\lambda$. The explanation of SORT is given in terms of the spin $M_S$ and orbital momentum $M_L$ contributions to the total magnetization $M = M_S + M_L$. The similar effect should also be present in other materials with not completely quenched (non zero) orbital angular momentum $L$, a uniaxial magnetic anisotropy and the positive value of $\lambda$. Comment: 8 pages, 6 figures |
| Databáze: | arXiv |
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