高真空下利用脈衝磁場量測磁光科爾效應

本論文研究在大氣以及高真空環境下，利用電容瞬間放電，使電流流經雙銅線線圈，產生毫秒等級之正、負脈衝磁場。此脈衝磁場之強度會根據電容放電時的電壓而改變。通過理論模擬的方式使脈衝磁場較強且均勻，用以量測鍍在玻璃表面上鎳薄膜的表面磁光科爾效應（SMOKE）。此量測方式可以在毫秒等級的時間內得到磁光科爾訊號，進而作出磁滯曲線（hysteresis loop）。觀察磁性薄膜之矯頑力（coercivity），剩磁（remanence）以及磁滯曲線趨勢等特徵，與其他期刊之量測方式相比，其結果相符。證實此裝置量測之準確性。此技術也將可應用於磁性動態行為的研究上。

關鍵字

磁光科爾效應；脈衝磁場

並列摘要

The surface magneto-optical Kerr effect measurement in high vacuum was performed with a millisecond-pulsed magnetic field, which is generated from the controlled discharge of capacitors to the coils. The theoretical simulation is used to obtain the strong and uniform pulsed magnetic field. Compared with the conventional electromagnet, pulsed magnetic field is faster. The maximum field strength can be improved by increasing the charging voltage. A nickel film on the SiO2 is used as the test sample, and its magnetic hysteresis loop was successfully obtained. The magnetic coercive, remanence, and hysteresis curve characteristics of the magnetic film were observed. The results were consistent with the measurement methods of other periodicals. Verify the accuracy of this device measurement. This technique can be applied to the study of the dynamic magnetic properties in the future.