Fyzikální ústav Akademie věd ČR

The spin and orbital magnetic moment and g-factor of FeSi Heusler alloys were determined experimentally by ferromagnetic resonance (FMR) and SQUID magnetometry and compared with calculations performed by fully relativistic density functional theory. The experimental data are in a good agreement with the theoretical ones. Further on, using FMR, very low intrinsic relaxation constant G data were obtained, of the order of 10 Mrad/s. The results reveal an important step towards tailoring spin and orbital magnetism in the binary Heusler alloys; the relaxation properties enable application in ultrafast magnetic systems (magnetic field sensors, spintronic memories and oscillators) [Zakeri KH. et al., Spin and orbital magnetism in ordered Fe_3±δSi_1^-+δ binary Heusler structures: Theory versus Experiment, Phys. Rev. B 77 (2008) 104430, 1-5].
In cooperation with Universities Ruhr-Bochum and Duisburg-Essen (in the frame of DFG SFB 491, "Magnetic heterogeneous structures", 2008-11), contact: Z.Frait, tel. 266052164, fraitfzu [dot] cz