The ultrahigh vacuum magneto-optic Kerr effect microscope

Liang-Wei Lan^1,2*, Jui-Yang Tsai¹, Wei-Hsiang Wang¹, Chien-Cheng Kuo¹

¹Department of Physics, National Sun Yat-sen University, Kaohsiung, Taiwan
²Internal PhD program of science, National Sun Yat-sen University, Kaohsiung, Taiwan

* Presenter:Liang-Wei Lan, email:lanlw1990@gmail.com

Magneto-Optic Kerr Effect (MOKE) Microscope is a beneficial technique for investigating the magnetic domain image [1]. Real-time observation of the domain variation with an external magnetic field gives robust evidence for the microscale magnetic structures. Magnetization reversal processes in magnetic thin films are strongly correlated to morphology. Directly in-suit preparation and measurement in a clean vacuum offer the opportunity to characterize the relation between surface and magnetic properties. For the sake of it, we built an ultrahigh vacuum MOKE microscope, and it will be a branch of the photoelectron-related imaging and nano-spectroscopy (PRINS) station at NSRRC TPS-27A. PRINS station provides the localized intrinsic electronic band structure without the external magnetic field. Our system carries out the complementary long-range magnetic information with a 5-port electromagnet offering magnetic fields up to 200 mT and 450 mT along and normal to the surface plane of the sample. Both microscale magnetic properties and nanoscale electronic properties can be achieved at the PRINS station in the near future. For the mentioned delicate samples, a portable chamber is equipped to maintain the magnetic properties during sample transportation. Its vacuum is supported by a commercialized tiny-size ion pump which is expected for the ultrahigh vacuum circumstance.

Keywords: Magneto-Optic Kerr effect microscope, magnetic domain image, Ultrahigh vacuum