Green magnetite (Fe3O4): Unusual optical Mie scattering and magnetic isotropy of submicron-size hollow spheres

Quan-Lin Ye; Yoshikawa, Hirofumi; Bandow, Shunji; Awaga, Kunio
February 2009
Applied Physics Letters;2/9/2009, Vol. 94 Issue 6, pN.PAG
Academic Journal
Magnetite hollow spheres with a diameter of 650 nm and shell thickness of 40 nm exhibit an unexpected green color, in contrast with usual magnetite solids appearing black. This unusual green color is interpreted in terms of the Mie scattering on the inhomogeneous and low-density structure of the hollow spheres with a characteristic diameter that is comparable to the wavelength of the visible light. Further, thin films of the hollow spheres exhibit no two-dimensional shape anisotropy, reflecting the isotropic structure of individual particles. These results indicate the potential advantages in achieving unique physical properties through constructing hollow structures.


Related Articles

  • Long wavelength propagation of elastic waves in three-dimensional periodic solid-solid media. Ni, Qing; Cheng, Jianchun // Journal of Applied Physics;4/1/2007, Vol. 101 Issue 7, p073515 

    We present an approach for efficient, accurate calculations of the elastic wave properties of three-dimensional periodic solid-solid media with cubic lattice structures based on the principle that the elastic wave should be uniform when averaged over length scales much larger than the size of...

  • Dispersed failure of an anisotropic flywheel. Akhundov, M.; Sadayev, A. // Mechanics of Composite Materials;Jan2005, Vol. 41 Issue 1, p65 

    Based on a hereditary damage model of solids, the strength of a cylindrically anisotropic flywheel is calculated. By using a failure criterion, the location and time of initial failure is determined in relation to an anisotropy parameter, for which the ratio of rigidities in the tangential and...

  • Critical state behaviour of granular materials from isotropic and rebounded paths: DEM simulations. Sitharam, T. G.; Vinod, J. S. // Granular Matter;Jan2009, Vol. 11 Issue 1, p33 

    This paper presents the results of numerical simulations using the three-dimensional discrete element method (DEM) on the critical state behaviour of isotropically compressed and rebounded assemblies of granular materials. Drained and undrained (constant volume) numerical simulations were...

  • Comparative analysis of the two‐constant generalizations of hooke's law for isotropic elastic materials at finite strains. Adamov, A. A. // Journal of Applied Mechanics & Technical Physics;Sep/Oct2001, Vol. 42 Issue 5, p890 

    For ten models of the isothermal behavior of materials, the solutions of boundary‐value problems are studied for five types of the experimentally reproducible uniform stress–strain state with unchanged directions of the principal axes. It is found that, for three models, the...

  • Isotropic proton-detected local-field nuclear magnetic resonance in solids. Havlin, Robert H.; Walls, Jamie D.; Pines, Alexander // Journal of Chemical Physics;2/15/2005, Vol. 122 Issue 7, p074507 

    A nuclear magnetic resonance method is presented which produces linear, isotropic proton-detected local-field spectra for INS spin systems in powdered samples. The method, heteronuclear isotropic evolution (HETIE), refocuses the anisotropic portion of the heteronuclear dipolar coupling...

  • New Types of Spatial Structures in Multisublattice Antiferromagnets. Borisov, A. B. // Journal of Experimental & Theoretical Physics;Sep2005, Vol. 101 Issue 3, p437 

    A broad class of three-dimensional space structures in multisublattice antiferromagnets was found in the isotropic approximation (the principal chiral field model on the SU(2) group). According to the Andreev–Marchenko theory, this approximation is applicable to spin glasses and provides...

  • Photothermoacoustic Oscillations in a Solid—Piezoelectric Layered Structure. Kozachenko, V.V.; Kucherov, I. Ya. // Acoustical Physics;Mar2004, Vol. 50 Issue 2, p185 

    Photothermoacoustic oscillations in a thin plane-layered structure consisting of an isotropic solid and a piezoelectric crystal of class 6mm (or piezoelectric ceramics) are studied theoretically and experimentally. Expressions for the potential difference across an arbitrary layer of the...

  • Comparison of the Molecular Dynamics of C70 in the Solid and Liquid Phases. Hughes, R. M.; Mutzenhardt, P.; Rodriguez, A. A. // Advances in Physical Chemistry;2009, p1 

    A previous study of C70 in deuterated benzenes generated evidence suggesting C70 exhibited unique reorientational behavior depending on its environment. We present a comparison of the dynamic behavior of this fullerene, in the solid and solution phases, to explore any unique features between...

  • Magnetic properties of isotropic Sm-Fe-N magnets produced by compression shearing method. Saito, Tetsuji; Kitazima, Hiroshi // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p07A716 

    TbCu7-type Sm-Fe-N powder was consolidated into bulk materials at room temperature by the compression shearing method. The resultant Sm-Fe-N bulk magnets retained the original TbCu7-type structure without any appreciable decomposition. It was found that the TbCu7-type Sm-Fe-N bulk magnet is...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics