Research activities led by Michal Urbánek

Magnonics


3D magnetic nanostructures by FEBID/FIBID


Magnetic patterning by focused ion beam writing 

Direct writing of magnetic patterns by focused-ion-beam irradiation presents a favorable alternative to the conventional lithography approaches. We study epitaxially grown metastable face-centered cubic (fcc) Fe thin films which undergo structural (fcc->bcc) and magnetic (paramagnetic->ferromagnetic) phase transformation upon ion-beam-irradiation. By using focused ion beam we were able to write ferromagnetic (bcc Fe) patterns into the paramagnetic (fcc Fe) layer with sub-100 nm resolution with control over the saturation magnetization (irradiation dose) and even anisotropy (irradiation scanning direction). 

For further details, contact Michal Urbánek (michal.urbanek(at)ceitec.vutbr.cz).

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Magnetic vortices

Magnetic vortices are curling magnetization structures formed in micro- and nanosized magnetic disks and polygons. They are known for having four different magnetization configurations (vortex states) that can be used for a multibit memory cell. We study dynamic magnetization processes of switching of the vortex states and we investigate the possibilities of writing two bits of information into a magnetic vortex. While most of the work has been done on planar structures, more recently we have been studying 3D vortices in micro- and nanosized spheres.  

For further details, contact Michal Urbánek (michal.urbanek(at)ceitec.vutbr.cz).

Related publications: