A method to measure the two-dimensional image of magneto-optical Kerr effect

作者：Zhu XS; Zhao HB; Zhou P; Xia GQ; You HY; Zhang RJ; Li J; Wang SY; Ni WM; Chen LY^*

来源：Review of Scientific Instruments, 2003, 74(11): 4718-4722.

DOI：10.1063/1.1618012

A two-dimensional (2D) image of magneto-optical Kerr effect measurement system has been designed and constructed. The magnetic field is provided by two cylindrical permanent magnets in the 0-8000 G range. To avoid beam deviation and other problems in the measurement, an electronically controlled liquid crystal retarder with a fixed polarizer was used to detect the polarization change of the light at the 546.1 nm wavelength. The Fourier transformation method was used to retrieve the Kerr signal in data analysis. The Kerr image signal was measured by using a 2D charge coupled diode (CCD) array detector with 1536x1024 pixels. In terms of a telescope with 1:1 optical magnification, the CCD pixel detects the Kerr signal that is produced by the microsurface of the sample with the area size equaling to that of the pixel. The image Kerr effect of GdFe film sample was measured with the results to show that the 2D Kerr pattern can map the in-plane distribution of the magnetic property of the sample surface.

• 出版日期2003-11
• 单位复旦大学