Studies of magnetism and mgnetoresistance in Py╱Ru╱Py trilayers

• Main Authors: Meng-Kai Hsing, 幸盟凱
• Other Authors: J.C.A Huang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/z25wat

碩士 === 國立成功大學 === 物理學系碩博士班 === 90 === By molecular beam epitaxy (MBE), the author has prepared high-quality NiFe80Fe20 / Ru / NiFe80Fe20 trilayers with different spacer (Ru) thickness on Al2O3(11-20) substrates. This thesis study on the magnetoresistance effect and the oscillation behavior of antiferromagnetic coupling as a function of the Ru thickness in Ni80Fe20╱Ru╱Ni80Fe20 trilayers. The oscillation of the interlayer coupling as a function of the spacer thickness and the giant magnetoresistance effect have been extensively studied in recent years. In particular, Fe/Cr, Co/Cr, Co/Cu systems have been studied by different authors. In this work, we use the trilayers system—NiFe80Fe20 / Ru / NiFe80Fe20 success to find the oscillation behavior of antiferromagnetic coupling. In our experiment, Reflection high-energy electron diffraction (RHEED) has been employed to study the epitaxial relation and surface of the trilayers structure. Longitudinal magneto-optical Kerr effect (LMOKE) and vibration sample Magnetometer (VSM) have been used to investigate the magneto-optical properties. Atomic Force Microscopy (AFM) has been used to observe the atom and roughness on the trilayers surface. We also use the Magneto-Resistance (MR) to observe the ratio of resistance with field.