研究目的
Investigating the possibility of local all-optical magnetization reversal in a thin ferrimagnetic rare-earth—transition metal film (DyFeCo) by femtosecond laser pulses.
研究成果
The possibility of the local magnetiztion reversal in the thin rare-earth—transition metal Dy0.22Fe0.68Co0.1 amorphous film by unit femtosecond laser pulse and pulse sequences is shown. The minimum energy density at which the change of magnetic order was observed is 3 ± 0.3 mJ/cm2.
研究不足
The study did not observe the all-optical switching process for films of pure magnetic elements, only for alloys and heterostructures of 3d and 4f elements. The problem of the time of rotation of local magnetization direction remains open.
1：Experimental Design and Method Selection:
The study used linearly and circularly polarized 35 fs laser pulses to demonstrate the local all-optical magnetization reversal in a DyFeCo thin film.
2：Sample Selection and Data Sources:
A ferrimagnetic rare-earth—transition metal Dy
3：22Fe68Co1 amorphous alloy film was prepared by magnetron sputtering. List of Experimental Equipment and Materials:
Ti:sapphire laser system (Katyusha, OOO AVESTA-PROEKT), Glan-Taylor prism (Thorlabs, GT10, 1/100000), quarter-wave plate (Thorlabs, AHWP05M-600).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser radiation was focused on a sample at room temperature to a spot 5 μm in diameter. The film was exposed to either single pulse or a sequence of pulses.
5：Data Analysis Methods:
The change of the perpendicular component of resulting magnetization direction in the sample subjected to exposure was studied using MOKE microscopy.
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