GROWTH AND MAGNETIC CHARACTERIZATION OF FACE-CENTERED-CUBIC CO ON (001) DIAMOND

We report the growth and characterization of face centered cubic (fcc) Co epitaxial films (t = 10-130 nm) on diamond. Growth was carried out under ultrahigh vacuum conditions in a commercial molecular beam epitaxy machine and monitored during growth using reflection high energy electron diffraction which showed single crystal growth oriented with <100>Coparallel-to<100>C. X-ray diffraction studies of the 130 nm sample demonstrated the single crystal fcc growth throughout the entire sample. Vibrating sample and quantum interference magnetometry yields a magnetic moment of (1.05+/-0.1) x 10(3) emu/cm3. Ferromagnetic resonance measurements carried out at 35 GHz yield a large cubic anisotropy K1/M(S) = (-480+/-30) Oe and linewidth of the order of 110 Oe. Spin waves were observed in the thicker samples and the exchange constant determined to be A(Co) = 1.09 x 10(-6) erg/cm.