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Type: Artigo de periódico
Title: Magnetic Moment Of Fe3 O4 Films With Thicknesses Near The Unit-cell Size
Author: Gomes G.F.M.
Bueno T.E.P.
Parreiras D.E.
Abreu G.J.P.
De Siervo A.
Cezar J.C.
Pfannes H.-D.
Paniago R.
Abstract: We perform a systematic study on the evolution of the magnetic spin moment (ms) of epitaxial [100]- and [111]-magnetite films of increasing thickness. The ultrathin films are characterized by low-energy electron diffraction, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism (XMCD). By employing sum rules on the XMCD spectra we obtain ms=3.6 μB/f.u. for samples of around 35 Å. This is considered a bulk value and has been reported only for films more than 10 times thicker. Moreover, we show that even 10-Å-thick magnetite already presents a significant magnetic moment. For both grown directions the moment increases similarly with the thickness. The ferromagnetic behavior for each iron ion site (Feocta2+, Feocta3+, Fetetra3+) of Fe3O4 is measured by monitoring XMCD peaks. The deduced hysteresis curves (per ion, per site) exhibit a coercive field of 300 Oe. Our results show that both the ferrimagnetic order and the bulk moment value are preserved at room temperature around the thickness of 2 unit cells.
Editor: American Physical Society
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.90.134422
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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