A5001082026- Magnetic properties of thin films
- Magnetic Properties and Synthesis of Ferrites
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Theoretical and Computational Physics
- Multiferroics and related materials
- Magnetic Properties and Applications
- Iron oxide chemistry and applications
- Magnetic and transport properties of perovskites and related materials
- Metallic Glasses and Amorphous Alloys
- ZnO doping and properties
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic Properties of Alloys
- Metal and Thin Film Mechanics
- Microbial metabolism and enzyme function
- Surface Roughness and Optical Measurements
- Pigment Synthesis and Properties
- Transition Metal Oxide Nanomaterials
- High-pressure geophysics and materials
- Nanomaterials for catalytic reactions
- Electronic and Structural Properties of Oxides
- Microwave Dielectric Ceramics Synthesis
- Hemoglobin structure and function
- Advanced Materials Characterization Techniques
- Electrical and Thermal Properties of Materials
Institute of Structure of Matter
2011-2022
National Research Council
2020
Consorzio Roma Ricerche
1989-2015
Baikov Institute of Metallurgy and Materials Science
2009
Institute of Nanostructured Materials
2009
Sapienza University of Rome
2005
Istituto di Metodologie Chimiche
1988-2002
Assing (Italy)
1999
Bologna Research Area
1992
Universitat de Barcelona
1991
The magnetic properties of ultra-small (3 nm) CoFe(2)O(4) nanoparticles have been investigated by DC magnetization measurements as a function temperature and field. main features the behaviour are blocking non-interacting particle moments (zero-field-cooled T(max) approximately 40 K), rapid increase saturation (up to values higher than for bulk material) at low T an in anisotropy below 30 K due appearance exchange bias. is determined random freezing surface spins. Localized spin-canting...
The spin-flop transition of acicular hematite nanoparticles different size synthesized by chemical route and annealed at temperatures has been investigated as a function temperature. Transmission electron microscopy (TEM) measurements show that particles have an ellipsoidal shape, with major axis $330\ifmmode\pm\else\textpm\fi{}50\mathrm{nm}$ minor $70\ifmmode\pm\else\textpm\fi{}10\mathrm{nm}.$ TEM x-ray diffraction experiments are made crystallites, which grow on increasing the annealing...
In this work we report on the synthesis, microstructural characterization, and magnetic properties of ∼7 nm bimagnetic core/shell nanoparticles prepared by seed-mediated growth high temperature decomposition organometallic precursor. The are formed an antiferromagnetic CoO core coated with ferromagnetic CoFe2O4 shell 2–3 thickness. XRD electron diffraction patterns show reflections structure phases Dark- Bright-field TEM images provide evidence core–shell morphology system. Magnetic...
Magnetic interactions in silica coated spherical nanoporous assemblies of CoFe2O4 nanoparticles have been investigated by low temperature field dependent remanent magnetization (MDCD and MIRM) relaxation measurements. The synthesis procedure leads to the formation aggregates about 50–60 nm diameter composed hexagonal shaped nanocrystals with shared edges. negative deviation from non-interacting case Henkel plot indicates predominance dipole–dipole favouring demagnetized state, although...
The thermal decomposition of acetylacetonate precursors is one the most employed syntheses to prepare high quality colloidal magnetic nanoparticles. In this paper, an advanced version synthetic approach was developed cobalt ferrite nanoparticles, introducing for first time a rigorous control on commonly neglected reaction parameter, that is, residual oxygen content in environment. A new concept derived from statistical analysis S(T)EM images, i.e., so-called aspects maps, introduced: tool...
The magnetic properties of ultra-small (~2 nm) δ-(Fe(0.67)Mn(0.33))OOH nanoparticles prepared by a microemulsion technique have been investigated magnetization and ac susceptibility measurements at variable frequency. results provide evidence two different regimes whose onset is identified maxima in the zero-field-cooled susceptibility: large one, centered ~150 K (T(mh)), narrow one ~30 (T(ml)). temperatures exhibit frequency dependence: T(mh) follows Vogel-Fulcher law τ =...
In this work, we studied the dynamic and static magnetic properties of ZnO-core/CoFe2O4-shell CoO-core/CoFe2O4-shell nanoparticles. Both systems are formed by a core ∼4 nm diameter encapsulated in shell ∼2 thickness. The mean blocking temperature changes from 106(7) to 276(5) K when is diamagnetic or antiferromagnetic, respectively. Magnetic remanence studies revealed presence weak dipolar interparticle interactions, where Hint approximately −0.1 kOe for ZnO/CoFe2O4 −0.9 CoO/CoFe2O4, playing...
ZnO-core/CoFe2O4-shell nanoparticles of 7.4 nm average size have been synthesized and their magnetic properties compared to those CoO-core/CoFe2O4-shell with similar morphology. The coercive field values are much lower than for CoO/CoFe2O4 (e.g., at 5 K: Hc = 7.8 kOe ZnO/CoFe2O4; 27.8 CoO/CoFe2O4). nature the is explained by a phenomenological model free energy non-magnetic core, or an antiferromagnetic encapsulated hard ferrimagnetic shell.
Carbonated hydroxyapatite (CHA)-coated titanium can find wide applications as bone substitute implant in and dental surgery orthopedics, promoting osseointegration with a host ensuring biocompatibility bioactivity. In this work, carbonated films were prepared on substrates by pulsed laser deposition at different substrate temperatures ranging from 30 to 750 °C. The properties of investigated scanning electron microscopy, atomic force energy-dispersive X-ray diffraction, Fourier transform...
Nowadays, a wide number of applications based on magnetic materials rely the properties arising at interface between different layers in complex heterostructures engineered nanoscale. In ferromagnetic/heavy metal multilayers, such as [Co/Pt]N and [Co/Pd]N systems, proximity effect was demonstrated to be asymmetric, thus inducing moment Pt (Pd) layer that is typically higher top Co/Pt(Pd) interface. this work, advanced spectroscopic imaging techniques were combined with theoretical approaches...
The magnetization reversal mechanism in perpendicular soft/hard Fe/FePt exchange-coupled bilayers has been investigated as a function of the soft layer thickness (tFe = 2, 3.5, 5 nm) combining loops at variable angle, magnetic domain analysis by force microscopy and numerical micromagnetic simulations. analytical model proposed literature can properly account for some features mechanism, such positive nucleation fields reduction coercive field remanence increasing thickness, but cannot...
Abstract Weakly magnetic hematite (α‐Fe 2 O 3 ) nanoparticles were synthesized by heating an amorphous polymer supported iron(III) complex ( Fe_POL at 400 °C for 4 h in air. The growth of (NPs) was studied PXRD, the from 150 to 25 intervals, revealing that, all temperatures, only crystalline phase detected is hematite. Conversely, annealing under nitrogen, yielded a material containing wüstite (FeO) as phase, onto pyrolised acrylamidic polymer. materials characterized TXRF, SEM‐EDS, XPS,...
Bimagnetic nanoparticles have been proposed for the design of new materials with controlled properties, which requires a comprehensive investigation their magnetic behavior due to multiple effects arising from complex structure. In this work we fabricated bimagnetic core/shell formed by an $\ensuremath{\sim}3$-nm antiferromagnetic (AFM) CoO core encapsulated within $\ensuremath{\sim}1.5$-nm ferrimagnetic (FiM) ${\mathrm{Co}}_{0.5}{\mathrm{Ni}}_{0.5}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ shell,...
Thin films of Bi-Sr-Ca-Cu-O, deposited on (100) cubic zirconia by laser ablation from a bulk superconducting target nominal composition BiSrCaCu2 Ox , have been investigated dc resistance and magnetically modulated microwave absorption measurements. The latter technique reveals important features regarding the phase purity samples that are masked in behavior films, as function substrate temperature during deposition post-deposition annealing conditions, is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHemiporphyrazine, a porphyrin-related macrocycle that induces rhombically compressed stereochemistries: structure and properties of bis(pyridine)(hemiporphyrazinato)nickel(II)E. Agostinelli, D. Attanasio, I. Collamati, V. FaresCite this: Inorg. Chem. 1984, 23, 8, 1162–1165Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April...