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Journal article

Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocomposites

By Frandsen, Cathrine1,2; Lefmann, Kim; Lebech, Bente2; Bahl, Christian Robert Haffenden3,4; Brok, Erik1,2; Ancona, S. N.5; Kuhn, Luise Theil; Keller, L.6; Kasama, Takeshi7; Gontard, Lionel Cervera7; Mørup, Steen2 ...and 1 more

From

Surface Physics and Catalysis, Department of Physics, Technical University of Denmark1

Department of Physics, Technical University of Denmark2

Electrofunctional materials, Department of Energy Conversion and Storage, Technical University of Denmark3

Department of Energy Conversion and Storage, Technical University of Denmark4

SimCorp A/S5

Paul Scherrer Institute6

Center for Electron Nanoscopy, Technical University of Denmark7

We report that the spin structure of alpha-Fe2O3 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 similar to 70 degrees) in alpha-Fe2O3 nanoparticles has, in appearance, similarities to the Morin transition in bulk alpha-Fe2O3, but its origin is different-it is caused by exchange coupling between aggregated nanoparticles of alpha-Fe2O3 and NiO with different directions of easy axes of magnetization.

Language: English
Year: 2011
ISSN: 1550235x , 10980121 and 01631829
Types: Journal article
DOI: 10.1103/PhysRevB.84.214435
ORCIDs: 0000-0003-4282-756X , Frandsen, Cathrine , Bahl, Christian Robert Haffenden , Kuhn, Luise Theil and Kasama, Takeshi
Keywords

AGGREGATION ANISOTROPY CRYSTAL-GROWTH Dependence HEMATITE NANOPARTICLES MAGNETIC-PROPERTIES NIO NANOPARTICLES Physics Size

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