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04652 Exchanged-Biased Magnetic Films May Liang Mentor: Herbert Hopster Metallic thin films possess unique magnetic properties, which is absent in their bulkier form. Through studying the hysteresis curves, which records the change of the magnetization of the sample with a changing external magnetic field, it is observed that the samples have different values of magnetization. These values depend on the change of the external magnetic field, and reach extreme values at the saturation points. The focus of this project is exchanged-biased magnetic films. When ferromagnetic ultra-thin films on the nano-scale are in contact with antiferromagnetic film, the properties of the ferromagnet can be greatly altered due to magnetic interface coupling. Exchange bias means that the antiferromagnetic film imposes a preferred magnetization direction on the ferromagnet. In this project we deposit ultra-thin (thickness on the order of 10 nm) films of different materials to produce exchange-coulpled bi-layers of Fe and Mn. The sample preparation is done under ultra-high vacuum (UHV) conditions in the 10-10 Torr range. Materials are evaporated from high-purity electron beam evaporation sources. The magnetic properties are investigated ex-situ by magneto-optical Kerr effect (MOKE) measurements. Temperature dependent hysteresis curves look for a difference in the hysteresis curve of the ferromagnetic layer (Fe) due to the magnetic ordering of the antiferromagnetic (Mn) layer.