Impact of mechanical damaging on magnetic nanosystems deposited on strechable substrates – DAMMAG

The DAMMAG project aims at studying the modifications of magnetic properties of thin films deposited on polymers, as a function of controlled complex loading paths ranging from small up to large deformations. Indeed, the relationships between the changes of magnetic properties of thin films and damages such as crack patterns which are specific to large deformations, have not yet been studied whereas flexible and stretchable magnetic devices undergo such deformations during their use. An original experimental setup will be developed on a diffractometer by combining a biaxial deformation machine, a MOKE setup to measure magnetic properties (both in imaging and magnetometry), resistivity measurements and accurate strain measurement by digital image correlation technique. In addition, simulations will be carried out in order to reproduce:
1) the applied deformation fields and the different crack patterns observed experimentally and,
2) the deformation field gradients to simulate the modifications of the magnetic properties.