Optimisation of measuring magneticproperties of micro-structuresusing the magneto-optic Kerr effect

• Main Authors: Persson, Måns, Lindh, Filip
• Format: Others
• Language: English
• Published: Uppsala universitet, Materialfysik 2016
• Subjects: moke; magnetism; elektromagnetism
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-306118

Magnetic storage means storage of data using magnetised medium and is widespreadover the world today, especially in hard disk drives. Using this kind of storagerequires knowledge about these materials. A way to study thin magnetic materials isto use MOKE(magneto optical Kerr effect). A Moke-system is a setup to measure thinmagnetic films by shooting a laser and analyze the reflected beam.The purpose of this report is to document and if possible improve a MOKE-system,named HOMER. This includes temperature regulation, filters, amplifiers, opticalchopper, Helmholtz coils and a laser. HOMER was documented and some changeswere made. The PID-parameters were set successfully. A low pass filter wasremoved, which decreased the noise. Using an optical chopper and lock in amplifierhowever did not decrease the noise. A labview program was written to demagnetizethe samples in a certain time which seemed to work properly. The hall probe in thesystem was successfully calibrated.