Magnetism and Thermal Transport of Exchange-Spring-Coupled LaSrMnO/LaMnCoO Superlattices with Perpendicular Magnetic Anisotropy.

Superlattices (SLs) comprising layers of a soft ferromagnetic metal LaSrMnO (LSMO) with in-plane (IP) magnetic easy axis and a hard ferromagnetic insulator LaMnCoO (LMCO, out-of-plane anisotropy) were grown on SrTiO (100)(STO) substrates by a metalorganic aerosol deposition technique. Exchange spring magnetic (ESM) behavior between LSMO and LMCO, manifested by a spin reorientation transition of the LSMO layers towards perpendicular magnetic anisotropy below = 260 K, was observed. Further, 3ω measurements of the [(LMCO)/(LSMO)]/STO(100) superlattices revealed extremely low values of the cross-plane thermal conductivity (300 K) = 0.

Spinodal decomposition introduces strain-enhanced thermochromism in polycrystalline VTiO thin films.

Processes of self-organization play a key role in the development of innovative functional nanocomposites, allowing, in particular, the transformation of metastable solid solutions into multilayers by activating spinodal decomposition instead of layer-by-layer film growth. We report the formation of strained layered (V,Ti)O nanocomposites in thin polycrystalline films using a spinodal decomposition. Already during the growth of VTiO films, spinodal decomposition was detected while producing atomic-scale disordered V- and Ti-rich phases.

Ultrafast element-resolved magneto-optics using a fiber-laser-driven extreme ultraviolet light source.

We present a novel setup to measure the transverse magneto-optical Kerr effect in the extreme ultraviolet spectral range based on a fiber laser amplifier system with a repetition rate between 100 and 300 kHz, which we use to measure element-resolved demagnetization dynamics. The setup is equipped with a strong electromagnet and a cryostat, allowing measurements between 10 and 420 K using magnetic fields up to 0.86 T.