Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Magnetization and Demagnetization Dynamics III
MA 36.7: Vortrag
Mittwoch, 9. März 2016, 16:45–17:00, H34
Temperature dependent laser induced magnetization switching in Tb22Fe69Co9 ferrimagnetic thin film by photoelectron emission microscopy — •Ashima Arora, Lukas Gierster, Ahmet Ünal, and Florian Kronast — Helmholtz-Zentrum Berlin, Albert-Einstein Str. 15, 12489 Berlin, Germany
All optical helicity dependent switching has drawn a significant attention for data storage applications in the view of controlling the magnetic state of material without applying high magnetic fields. It has been shown in the previous studies that the magnetization of ferrimagnets like Tb22Fe69Co9 can be altered by circularly polarized femtosecond laser pulses[1-2]. This magnetization reversal process involves a competition between different effects arising from laser heating, helicity dependent momentum transfer and dipolar fields. Using X-Ray photoelectron emission microscopy (PEEM), we distinguished the influence of the three effects using a µm sized laser spot [3]. To investigate the magnetic switching in greater detail, measurements were performed at different temperatures which show that the effect of helicity dependent switching is stronger at lower temperatures. We observe that the total area switched by a single circularly polarized femtosecond laser pulse and the average domain size, both increase with the sample temperature. These observations might be attributed to temperature dependent threshold in laser switching process.
1. S.Mangin et al., Nat. Mater. 13, 286-292 (2014)
2. C-H. Lambert et al., Science 345, 6202(2015)
3. L. Gierster et al., Ultramicroscopy (2015) doi:10.1016/j.ultramic.2015.05.016