Studies of magnetism and superconductivity by scanning probe microscopy2012.07.11
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Room-temperature scanning probe microscopy (RT-SPM) is widely used to study electronic and magnetic properties at the sub-micron scale in basic and applied science. By analogy with RT-SPM, low-temperature SPM (LT-SPM) is a key tool to investigate phase transitions at low temperature, such as ferromagnetism and superconductivity. In this talk, I will present a variety of LT-SPM techniques to directly image magnetic and electric properties in ferro- and ferri-magnetic materials, and metal insulator transition materials. Recently, we developed a novel technique to measure the absolute value of the magnetic penetration in superconductors by magnetic force microscopy (MFM). This technique has been applied to unconventional superconductors, such as borocarbides and pnictides, to investigate superconducting properties. Also, direct visualization of the interaction between magnetism and superconductivity will be present in a ferromagnet-superconductor hybrid.