Print Email Facebook Twitter Magnetic topology of Co-based inverse opal-like structures Title Magnetic topology of Co-based inverse opal-like structures Author Grigoryeva, N.A. Mistonov, A.A. Napolskii, K.S. Sapoletova, N.A. Eliseev, A.A. Bouwman, W.G. Byelov, D.V. Petukhov, A.V. Chernyshov, D.Y. Eckerlebe, H. Vasilieva, A.V. Grigoriev, S.V. Faculty Applied Sciences Department RRR/Radiation, Radionuclides and Reactors Date 2011-08-11 Abstract The magnetic and structural properties of a cobalt inverse opal-like crystal have been studied by a combination of complementary techniques ranging from polarized neutron scattering and superconducting quantum interference device (SQUID) magnetometry to x-ray diffraction. Microradian small-angle x-ray diffraction shows that the inverse opal-like structure (OLS) synthesized by the electrochemical method fully duplicates the three-dimensional net of voids of the template artificial opal. The inverse OLS has a face-centered cubic (fcc) structure with a lattice constant of 640±10 nm and with a clear tendency to a random hexagonal close-packed structure along the [111] axes. Wide-angle x-ray powder diffraction shows that the atomic cobalt structure is described by coexistence of 95% hexagonal close-packed and 5% fcc phases. The SQUID measurements demonstrate that the inverse OLS film possesses easy-plane magnetization geometry with a coercive field of 14.0 ± 0.5 mT at room temperature. The detailed picture of the transformation of the magnetic structure under an in-plane applied field was detected with the help of small-angle diffraction of polarized neutrons. In the demagnetized state the magnetic system consists of randomly oriented magnetic domains. A complex magnetic structure appears upon application of the magnetic field, with nonhomogeneous distribution of magnetization density within the unit element of the OLS. This distribution is determined by the combined effect of the easy-plane geometry of the film and the crystallographic geometry of the opal-like structure with respect to the applied field direction. To reference this document use: http://resolver.tudelft.nl/uuid:c6ae86bf-2a1d-401c-99d0-690bda6822c6 DOI https://doi.org/10.1103/PhysRevB.84.064405 Publisher American Physical Society ISSN 1098-0121 Source http://link.aps.org/doi/10.1103/PhysRevB.84.064405 Source Physical Review B, 84 (6), 2011 Part of collection Institutional Repository Document type journal article Rights © 2011 the Author(s)American Physical Society Files PDF Bouwman_2011.pdf 1.26 MB Close viewer /islandora/object/uuid:c6ae86bf-2a1d-401c-99d0-690bda6822c6/datastream/OBJ/view