Magnetic polarons reach a hundred thousand Bohr magnetons.

The ability of light to manipulate fundamental interactions in a medium is central to research in optomagnetism and applications in electronics. A prospective approach is to create composite quasiparticles, magnetic polarons, highly susceptible to external stimuli. To control magnetic and transport properties by weak magnetic and electric fields, it is important to find materials that support photoinduced magnetic polarons with colossal net magnetic moments.

Automatic thermal conductivity measurements with 3-omega technique.

This article describes an improvement of the 3-omega thermal conductivity measurement system facilitating automatic mode measurement. The use of the electrical circuit with negative feedback to compensate the first harmonic in the voltage signal on the heater-thermometer eliminates manual resistance tuning. To test the procedure, measurements of the thermal conductivity of single crystal sapphire AlO were made.