Showing papers by "George C. Ho published in 1994"
TL;DR: In this paper, the authors reported the first results employing a new technique for studying heteromagnetic multilayers by element specific magnetic hysteresis measurements using soft x-ray magnetic dichroism.
Abstract: We report the first results employing a new technique for studying heteromagnetic multilayers by element specific magnetic hysteresis measurements. Dramatically different Fe and Co hysteresis curves of Fe/Cu/Co trilayers were obtained by recording the soft x‐ray magnetic dichroism1 at their respective L3 absorption edges as a function of the applied magnetic field. The complicated conventional hysteresis curves, obtained by a vibrating sample magnetometer, were resolved into linear combinations of the two individual elemental hysteresis curves, thus determining the average atomic magnetic moments of each element within the multilayer structure (Fe is 2.0±0.08 μB and Co is 1.1±0.04 μB). Furthermore, fine hysteresis features associated with one element, imperceptible in the conventional curves, were also observed, and demonstrate a new and powerful means for studying heteromagnetic multilayer systems.
4 citations
TL;DR: In this paper, high quality L2,3 edges magnetic circular dichroism (MCD) data of in situ grown Fe, Co, and Ni ferromagnetic thin films were measured using transmission x-ray absorption technique.
Abstract: High quality L2,3 edges magnetic circular dichroism (MCD) data of in situ grown Fe, Co, and Ni ferromagnetic thin films were measured using transmission x‐ray absorption technique. These data were utilized to investigate the validity of the recently proposed x‐ray MCD sum‐rules that offer a new means for deducing orbital‐ and spin‐magnetic moments from MCD data. We find that the orbital to spin magnetic moment ratios of Fe, Co, and Ni deduced from MCD data according to the sum‐rules are at ±30% discrepancy with those deduced from neutron scattering data. This inconsistency may be attributed to the neglecting of multi‐electron excitations and band structure effects in the derivation of the sum‐rules or due to uncertainties in the neutron scattering results. Caveats for MCD data taken with the fluorescence yield x‐ray absorption technique will also be discussed.