Writers: A. W. Arins; H. F. Jurca; J. Zarpellon; J. Varalda; I. L. Graff1; A. J. A. de Oliveira; W. H. Schreiner; and D. H. Mosca.
Keywords: ultra-thin films; magnetization
Abstract: We report on high quality MnGa epilayers directly grown on GaAs(111)-(1 × 1) reconstructed surface. MnGa layers are characterized by the stacking of (111) planes of tetragonal zinc-blende structure, which are rotated by 11° with respect to the underlying (111) planes of the GaAs lattice. These ultra-thin MnGa epilayers with lattice parameters a = 0.55 nm and c = 0.61 nm are stabilized for thickness between 5 and 20 nm with a net magnetic moment of 3.2 μB per Mn atom. These epilayers are potentially suited for semiconductor spintronics applications due to the reversal of its magnetization in relatively low magnetic fields.
O CDMF é um dos Centros de Pesquisa, Inovação e Difusão (CEPID) apoiados pela FAPESP. O Centro também recebe investimento do CNPq, a partir do Instituto Nacional de Ciência e Tecnologia dos Materiais em Nanotecnologia (INCTMN).
Writers: Ariadne C. Catto, Luís F. da Silva, Maria Inês B. Bernardi, Sandrine Bernardini, Khalifa Aguir, Elson Longo, and Valmor R. Mastelaro Keywords: cobalt; gas sensor; ozone; XANES spectroscopy; XPS; zinc oxide Abstract: A detailed study of the […]
Role of Dipolar Interactions and Volume Particle Size Distribution on the Nonmonotonic Magnetic Field Dependence of the Blocking Temperature in Magnetic Nanoparticles Abstract: The nonmonotonic behavior of the magnetic field dependence H of the superparamagnetic blocking […]
Writers: Juliane Maria GUERREIRO-TANOMARU; Fernando Antonio VÁZQUEZ-GARCÍA; Roberta BOSSO-MARTELO; Maria Inês Basso BERNARDI; Gisele FARIA; Mario TANOMARU FILHO Keywords: Physicochemical analysis; Biofilms; Enterococcus faecalis; Zirconium; Nanotechnology Abstract Objective Mineral Trioxide Aggregate (MTA) is a calcium silicate cement composed of Portland cement (PC) and bismuth oxide. Hydroxyapatite has been incorporated […]