Magento Optical Kerr Effect Measurement of Magnetic Thin-Films on Self-Assembled Nanospheres
Authors:Brian Flores, Russell Gleason
Mentor:Jiyeong Gu, Associate Professor of Physics, California State University Long Beach
We are exploring how the topography of substrate surface alters the magnetic property of ferromagnet bilayer system. Ferromagnet bilayer system has presented an interesting magnetic switching behavior originating from the magnetic interaction at the interface. This switching is known to be notably sensitive to the relative thickness of the two layers. Using nanospheres we modified the topography of substrate; 880 nm polystyrene nanospheres were uniformly self-assembled on silicon substrate and magnetic materials were deposited on them. Magnetic hysteresis measurements were made with a homemade Magneto Optical Kerr Effect (MOKE) system using a HeNe laser with maximum magnetic field of 1300 Oe. From preliminary data, it is observed that nanosphere topography has made a considerable change in magnetic property of thin films compared to the films grown directly onto silicon substrate.