M. Kohlmann
University of Greifswald,
Greifswald, Germany
Date & Time: 10:00 - 11:00, October 30th (Wed), 2024.
Place: 8F Middle Seminar Room, Main Bldg., Sengen.
Bias field and wavelength studies on the AOHDS efficiency
M. Kohlmann
University of Greifswald,
Greifswald, Germany
Abstract:
The relevance of heat-assisted magnetic recording (HAMR) motivates ongoing research and development in magnetization manipulation. We study all-optical helicity-dependent switching (AOHDS) of FePt granular media as a viable alternative method for magnetic writing of HAMR media. The interplay of magnetic dichroism and the inverse Faraday effect is currently understood as driving process behind the magnetization reversal. Ab-initio calculations of magnetic dichroism and inverse Faraday effect for the switching rates of single FePt nanoparticles provided us with a stochastic model for the switching process[1]. To get better insight into the underlying mechanics we performed a bias field study for different sample configurations provided by NIMS. Additionally, we present data for the wavelength dependent efficiency of the writing process from 800 nm - 1550 nm. We greatly acknowledge the DFG funding within the project "Fundamental aspects of all-optical single pulse switching in nanometer-sized magnetic storage media[2] and collaboration with the research around Prof. Takahashi at NIMS.
[1] R. John, Scientific Reports 7, 4114 (2017)
[2] M. Kohlmann, arXiv:2401.18010
[1] R. John, Scientific Reports 7, 4114 (2017)
[2] M. Kohlmann, arXiv:2401.18010