Magnetic properties of semiconductor-based heterostructures

L.B. STEREN, J. MILANO, J.C. ROJAS SANCHEZ, M. MARANGOLO, V. ETGENS, M. EDDRIEF

Buenos Aires

Workshop; New Trends in Condensed Matter Physics; 2004

Dpto. Fisica, Centro Atomico Constituyentes (Bs.As.)

The comprehension of the magnetic properties of hybrid nanostructures, built of magnetic and semiconducting materials is crucial for the design of spintronics devices. The magnetism of these structures lay on the magnetic coupling across semiconducting barriers, the magnetism at the ferromagnetic(FM)/ semiconductor(SM) interfaces  and the bulk and interface anisotropies of the magnetic layers. Ferromagnetic resonance spectroscopy (FMR) is one of the most used tool to study the magnetic properties of films and multilayers. The dependence of the resonance frequencies on the energy density of the samples, provides us the essential parameters that describe the magnetic properties of the structures. This technique is sensitive to very small amount of material and is capable to identify magnetic ions in different environments and materials with different anisotropies.  Our work is focused on the study of the magnetic coupling and magnetic anisotropies of FM/SM structures, based on FMR experiments. In this talk, I will present some recent results obtained in different semiconductor-based hybrid heterostructures.