Ultrafast heating effect on transient magnetic properties of L10-FePt thin films with perpendicular anisotropy |
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Authors: | Jiaqi Zhao Zongzhi Zhang B. Ma |
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Affiliation: | a Key Lab for Advanced Photonic Materials and Devices, and Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China b Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China |
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Abstract: | Laser-induced ultrafast magnetization dynamics and transient coercivity behavior in perpendicular magnetized L10-FePt films are investigated using the time-resolved polar magneto-optical Kerr technique. The magnetization after photo-excitation shows a dramatic reduction on the picosecond time scale. In contrast, the coercivity shows a weak decrease, accompanied by a skewed Kerr loop shape for low and intermediate fluences. The results can be interpreted by the laser-induced non-uniform demagnetization due to the weakened coupling between FePt grains of different size and/or components. The remaining coercivity vanishes when the film is fully demagnetized at higher fluence. We claim that the remaining coercivity can be manipulated by employing appropriate laser energy and film thickness, which may be helpful for application in heat-assisted magnetic recording. |
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Keywords: | FePt Thin films Ultrafast magnetization dynamics Perpendicular anisotropy Magneto-optical Kerr effect |
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