Recently a big effort has been put into the investigation of so-called spin valves, devices promising important advances in magnetic sensors, e.g. for hard disk read heads. Ballistic Electron Magnetic Microscopy (BEMM) is one method for investigating these devices. Electrons are injected through the tip of a Scanning Tunneling Microscope into a magnetic layer of a sample. The ballistic flow of electrons through the sample is studied at different magnetic fields while the tip-sample separation is controlled with the regular tunneling current...

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