Photothermally modulated spatially resolved FMR detection of Walker modes in yttrium iron garnet spheres

The photothermally modulated (PM) ferromagnetic resonance (FMR) combines the high sensitivity of conventional FMR and spatial resolution. This technique has been applied to a single-crystalline yttrium iron garnet (YIG) sphere with a diameter of 2 mm. For the first time, the spatial variation of the high-frequency magnetization patterns known as Walker modes were visualized and it is thus shown that PM-FMR can even be applied to unfavourable geometries

Photothermally modulated ferromagnetic resonance investigations of epitaxially grown thin Fe (001) films

The photothermally modulated (PM) ferromagnetic resonance (FMR) combines the high sensitivity of conventional FMR and the spatial resolution of thermal waves. For the first time, this alternative FMR-technique was applied to the magnetic characterization of high-quality thin Fe (001) films epitaxially grown on (001) GaAs substrate : Images of the distribution of crystalline anisotropy constant K1 and the magnetization M were determined from the locally resolved FMR spectra

Spatially resolved photomodulated microwave absorption and thermal wave images of boron doped silicon

A novel imaging technique for semiconductor samples, the photomodulated microwave absorption (PMA), is presented. The sample is placed in a microwave cavity and illuminated with a modulated focussed laser beam. The excited photo carriers disturb the distribution of the high-frequency electric field in the cavity and therefore change its quality factor. This change is accessible to the experiment. First results on a silicon sample with well defined boron doped areas (1015 cm-2) are resented and compared to Mirage experiments