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首页> 外文期刊>Physical review >Spin reorientation in α-Fe_2O_3 nanoparticles induced by interparticle exchange interactions in α-Fe_2O_3/NiO nanocomposites
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Spin reorientation in α-Fe_2O_3 nanoparticles induced by interparticle exchange interactions in α-Fe_2O_3/NiO nanocomposites

机译：α-Fe_2O_3/ NiO纳米复合材料中的粒子间交换相互作用引起的α-Fe_2O_3纳米粒子的自旋重取向

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摘要

We report that the spin structure of α-Fe_2O_3 nanoparticles rotates coherently out of the basal (001) plane at low temperatures when interacting with thin plate-shaped NiO nanoparticles. The observed spin reorientation (up to ～70°) in α-Fe_2O_3 nanoparticles has, in appearance, similarities to the Morin transition in bulk α-Fe_2O_3, but its origin is different-it is caused by exchange coupling between aggregated nanoparticles of α-Fe_2O_3 and NiO with different directions of easy axes of magnetization.
机译：我们报告说，当与薄板状NiO纳米粒子相互作用时，α-Fe_2O_3纳米粒子的自旋结构在低温下连贯地旋转出基（001）平面。在α-Fe_2O_3纳米粒子中观察到的自旋重取向（至约70°）在外观上与本体α-Fe_2O_3的莫林跃迁相似，但其起源不同-这是由α-Fe_2O_3的聚集纳米粒子之间的交换耦合引起的。 Fe_2O_3和NiO的易磁化轴方向不同。

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  • 来源
    《Physical review》 |2011年第21期|p.214435.1-214435.10|共10页
  • 作者

    C. Frandsen; K. Lefmann; B. Lebech; C. R. H. Bahl; E. Brok; S. N. Ancona; L. Theil Kuhn; L. Keller; T. Kasama; L. C. Gontard; S. Morup;

  • 作者单位

    Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;

    Nano-Science and eScience Centers, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5,DK-2100 Copenhagen 0, Denmark,European Spoliation Source, Lund, Sweden,Materials Research Division, Riso DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark;

    Nano-Science and eScience Centers, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5,DK-2100 Copenhagen 0, Denmark,Materials Research Division, Riso DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark;

    Materials Research Division, Riso DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark,Fuel Cells and Solid State Chemistry Division, Riso DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark;

    Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark,Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;

    Materials Research Division, Riso DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark;

    Materials Research Division, Riso DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark,Fuel Cells and Solid State Chemistry Division, Riso DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark;

    Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;

    Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;

    Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;

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  • 正文语种 eng
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  • 关键词

    fine-particle systems; nanocrystalline materials;

    机译：细颗粒系统;纳米晶材料;

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