Chakraborty, Akash and Wenk, Paul and Schliemann, John (2015) Lifetimes of magnons in two-dimensional diluted ferromagnetic systems. EUROPEAN PHYSICAL JOURNAL B, 88 (3): 64. ISSN 1434-6028, 1434-6036
Full text not available from this repository. (Request a copy)Abstract
Spin dynamics in low dimensional magnetic systems has been of fundamental importance for a long time and has currently received an impetus owing to the emerging field of nanoelectronics. Knowledge of the spin wave lifetimes, in particular, can be favorable for future potential applications. We investigate the low-temperature spin wave excitations in two-dimensional disordered ferromagnetic systems, with a particular focus on the long wavelength magnon lifetimes. A semi-analytical Green's functions based approach is used to determine the dynamical spectral functions, for different magnetic impurity concentrations, from which the intrinsic linewidth is extracted. We obtain an unambiguous q(4) scaling of the magnon linewidth which is ascribed to the disorder induced damping of the spin waves, thereby settling a longstanding unresolved issue on the wave-vector dependence. Our findings are also in good agreement with previous theoretical studies on Heisenberg ferromagnets. Additionally, we demonstrate the futility of using the low moments associated with the spectral densities to evaluate the magnon dispersions and lifetimes.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SPIN-WAVES; EXCITATIONS; FLUCTUATIONS; FRACTONS; DYNAMICS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Jul 2019 14:12 |
| Last Modified: | 22 Jul 2019 14:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5784 |
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