Large coercivity and low-temperature magnetic reorientation in ε-Fe <inf>2</inf>O <inf>3</inf> nanoparticles

M. Gich, A. Roig, C. Frontera, E. Molins, J. Sort, M. Popovici, G. Chouteau, D. Martín y Marero, J. Nogús

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A large coercive field, HC =20 kOe, is obtained at room temperature in ε- Fe2 O3 nanoparticles embedded in a silica matrix, produced by sol-gel chemistry. The combination of a relatively high magnetic anisotropy together with the small saturation magnetization are responsible for this large HC. Upon cooling, a strong reduction of HC is observed at T∼100 K, which is accompanied by a drastic reduction of the squareness ratio MR MS. Neutron-diffraction measurements reveal the existence of a low-temperature magnetic transition to which the softening of this material can be ascribed. © 2005 American Institute of Physics.
Original languageEnglish
Article number044307
JournalJournal of Applied Physics
Publication statusPublished - 15 Aug 2005


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