Besides using top-down fabrication techniques based on thin films and lithography, we are putting a strong emphasis on bottom-up research (self-organization), based on physical and chemical routes.
We use MFM in the MNM team, as a versatile technique for magnetic imaging of various materials and devices.
An elegant alternative to Molecular Beam Epitaxy is Pulsed Laser Deposition (PLD), where the energy to evaporate atoms from a target is provided by a nanosecond (or shorter) class IV laser, instead of Joule or electron bombardment heating. Peculiarities arise, such as the pulsed arrival of adatoms on the surface and their kinetic energy, which often promote layer-by-layer growth.
Combining XMCD, PEEM and the temporal structure of synchrotron radiation, we have developped a technique that allows a microscopic, element-selective study of fast magnetization reversal in heterogeneous magnetic systems like spin-valves and magnetic tunnel junctions.
PhotoEmission Electron Microscopy in combination with X-ray Magnetic Circular Dichroism (XMCD) is used by the group to perform high-resolution, element-selective magnetic imaging of thin films and nanostructures.
XMCD is a synchrotron-based technique that allows element-selective magnetic properties to be obtained
SPLEEM is an extension of the conventional Low-Energy Electron Microscopy (LEEM) in which the electron beam used for imaging is spin-polarized. SPLEEM is dedicated to magnetic imaging : when spin-polarized electrons are injected onto a ferromagnetic surface, the number of electrons... > suite