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Optical and extreme UV studies of spin dynamics in metallic and insulating ferrimagnets.
- Source :
-
Journal of Applied Physics . 12/28/2021, Vol. 130 Issue 24, p1-9. 9p. - Publication Year :
- 2021
-
Abstract
- We present all-optical studies of spin dynamics in two classes of ferrimagnets. Both sets of experiments use table-top laser-based pump–probe techniques to examine the ultrafast and longer timescale spin excitations. We use the visible/near infra-red time-resolved magneto-optical Kerr effect (tr-MOKE) to follow the spin dynamics of a series of metallic (FeCo) 1 − x Gd x thin films with varying Gd content. Magnetic compensation in the films occurs at a Gd concentration of ≈ 26 % , and the spin dynamics of the films exhibit a non-monotonic variation in effective magnetization. We also examine spin dynamics in an insulating NiFe 2 O 4 spinel using ultrafast techniques up at extreme ultraviolet energies, which permit element-specific investigations. The element and time-resolved delay scans reveal a non-trivial interaction between spin excitations on the different magnetic sub-lattices of the magnetic insulator. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 130
- Issue :
- 24
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 154430381
- Full Text :
- https://doi.org/10.1063/5.0073606