Abstract by Aaron Gentillon
Physics and Astronomy
Magnetic Imaging of Cobalt Platinum Multilayered Thin Films
My project is a study of morphological changes in the magnetic domains of multilayered Cobalt/Platinum thin films. The goal of the project is to experimentally find the optimal magnetic field at which the density of magnetic domains is maximized. To obtain this information, we image the magnetic domains in small areas of the films, usually about 100 μm2, with Magnetic Force Microscope (MFM), after a specific field has been applied to the material with a Vibrating Sample Magnetometer (VSM). The images are then statistically analyzed by counting the number of domains and plotting that number as a function of the magnitude of the previously applied magnetic field. We have eight samples of varying Cobalt thicknesses, from 4 Å to 60 Å. Each sample has been studied following two specific sequences of magnitude of previously applied field, both an ascending and a descending series, which means that a data set has been taken starting at a field value of 0 T and going to 9 T and vice-versa. My work has been to compare the ascending and descending series to see what effects the field history has on the domain density and if similar effects are observed in both ascending and descending series.