collective magnetic properties of cobalt nanocrystals
Tài liệu Báo cáo " The effect of cobalt substitution on structure and magnetic properties of nickel ferrite " pptx
... hence it was the increasing of HC The increasing of HC proved that the soft magnetic property of ferrite NiFe2O4 changed to the hard magnetic property of ferrite CoFe2O4 Ni-Co ferrite samples ... part of several tens percent of HC and the last one whereas can only reach several hundreds of gauss Thus, the increasing of Co-concentration led to the increasing of anisotropy property of ferrites ... characterization of nanosize nickel-substituted cobalt ferrites (Co1-xNixFe2O4), Journal of Solid State Chemistry, Vol 178 (2008) 3183 [3] Z.P Niu, Y Wang, F.S Li, Magnetic properties of nanocrystalline...
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THE INFLUENCE OF COBALT ON CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF nimnsbb2 HEUSLER ALLOYS
... effect depends on the properties of each material The physical origin of the MCE is the coupling of the magnetic sub lattice to the applied magnetic field, H, which changes the magnetic contribution ... regions with their own properties of material: ferromagnetic in the range of temperature from 200 K to 300 K, antiferromagnetic below 200 K c Applications Physical properties of interest to materials ... from 77 K to 291 K 3.2 Magnetic properties of NiMnSbB2 and NiMnSbCo1B2 alloys To survey magnetic properties of NiMnSbB2 and NiMnSbCo1B2 alloys, we make some following magnetic measurements: The...
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Tài liệu Báo cáo " Signficantly improving magnetic properties of Sr-La-Co hexagonal ferrite" doc
... increase up-spin of positions 2a and 2b About the role of La to improve hard magnetic properties of hexagonal ferrite, the Vietnamese researchers have published a large number of publications ... al Magnetic Properties of La-Co substituted M-Type Sr-Ferrite ultrafine Powders prepared from citrate recursors, Proc of the ICF9, SanFrancisco, California, USA (2004) 75 [9] L Neél Magnetic Properties ... and properties of Sr ferrite, J Phys IV, France (1997) CI 313 [17] N.Chau, N.K.Dung, D.L.Minh, B.T.Cong, High hard magnetic properties of Sr hexagonal ferrite substituted by La, Proceedings of...
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synthesis, structure and magnetic properties of iron-doped tungsten oxide nanorods
... ¼ 80 K with a magnetic moment of 2:5mB per atom of iron [17] The a-Fe2O3 phase is antiferromagnetic (paramagnetic) at temperatures To260 K (T4T N 950 K) while a destabilization of their perfect ... oxides In order to determine the magnetization contribution of different magnetic phases, a basic knowledge for the magnetic properties of bulk Fe and its oxides is crucial It is well known that ... magnetization at K of the asprepared sample in an applied field of T is as large as 56 Am2 =kg, arising from the magnetization of metallic Fe and its oxides Assuming a magnetic moment of 2:2mB per iron...
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Báo cáo khoa học: H NMR study of the molecular structure and magnetic properties of the active site for the cyanomet complex of O2-avid hemoglobin from the trematode Paramphistomum epiclitum pdf
... of the inuence of the heme orientation on functional properties of myoglobin Biochim Biophys Acta 1388, 349362 Emerson, S.D & La Mar., G.N (1990) NMR determination of the orientation of the magnetic ... R.J.P (1985) Comparison of the solution and crystal structures of mitochondrial cytochrome c Analysis of paramagnetic shifts in the nuclear magnetic resonance spectrum of ferricytochrome c J Mol ... conservation of the magnetic anisotropies of low-spin hemin with His/cyanide ligation The 10 tilt of the major magnetic or z-axis is shown to be consistent with the % 10 tilt of the Fe-CN vector...
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Báo cáo hóa học: " Synthesis and magnetic properties of Zr doped ZnO Nanoparticles" docx
... http://www.nanoscalereslett.com/content/6/1/587 Page of Figure XRD patterns represented by lines of different colors (a) XRD patterns of Zn1-xZrxO samples; (b) XRD patterns of Zn1-xZrxO samples in detail; (c) the variation of the lattice ... images of ZnO NPs with different Zr contents the result, those motivated us to carry out a comparative study on their magnetic properties Magnetization curves as a function of applied magnetic ... at RT of samples are revealed in Figure 6, where the contributions of the paramagnetism (PM) signals of the samples were deducted In the inset of Figure 6, which displays the M-H curves of the...
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Báo cáo hóa học: "Investigation of electrical and magnetic properties of ferro-nanofluid on transformers" pptx
... concentrations of ferro-nanofluids were applied to the magnetic cores of transformers The performance of transformers with magnetic cores of air Figure The coupling coefficients of transformers ... factor of coils of transformers with different magnetic cores Owing to the fact that the increase of resistance is larger and faster than that of inductance with the presence of Fe3 O4 nanofluids, ... magnetized curve of the Fe O nanofluid measured by a VSM Results and discussion Different magnetic cores, air, and Fe3O4 nanofluids of 0.25, 0.5, 0.75, and M were applied as the magnetic core of transformers...
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Báo cáo hóa học: "Fabrication and magnetic properties of granular Co/porous InP nanocomposite materials" ppt
... Tunable magnetic properties of heterogeneous nanobrush: from nanowire to nanofilm Nanoscale Res Lett 2010, 5:853-858 Silverberg J, Friedman A, Menon L: Growth and magnetic properties of polycrystalline ... synthesis of an array of nickel nanotubules and its magnetic behavior Adv Mater 2001, 13:1631-1633 Li DD, Thompson RS, Bergmann G, Lu JG: Template-based synthesis and magnetic properties of cobalt ... texture on magnetic characteristics of cobalt nanowires Nanoscale Res Lett 2010, 5:1111-1117 Cao HQ, Xu Z, Sang H, Sheng D, Tie CY: Template synthesis and magnetic behavior of an array of cobalt...
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Báo cáo hóa học: " Wet chemical synthesis and magnetic properties of single crystal Co nanochains with surface amorphous passivation Co layers" pdf
... superparamagnetic CoFe2O4 microspheres with high saturation magnetization Nanoscale Res Lett 2010, 5:1718 Cao H, Xu Z, Sang H, Sheng D, Tie C: Template synthesis and magnetic behavior of an array of cobalt ... of 8.86 Å (5 × 1.772 Å) is consistent with that of the [200] planes of single-crystalline face-centered Co, which is compatible with the data of XRD The SAED patterns (see the inset in Page of ... Papaefthymiou V, Kostikas A: Magnetic properties of ultrafine iron particles Phys Rev B 1992, 45:9778 14 Srikala D, Singh V, Banerjee A, Mehta B, Patnaik S: Control of magnetism in cobalt nanoparticles...
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Báo cáo hóa học: " Microscopic study of electrical properties of CrSi2 nanocrystals in silicon" potx
... differences in the vicinity of NCs Across most of the surface, the current was nearly constant and even independent of the polarity of the bias Locally, evidence of rectification could be observed ... conductivity of inclusions increases the locally sensed capacitance, and thus, the difference of electrical properties of silicon and CrSi2 gives a better contrast for the detection of the NCs ... (b) SCM image of the same area cross section of the SCM image across a NC is shown in Figure The half-width of the peak agrees with the size of the NCs It shows that the interaction of the charged...
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Báo cáo hóa học: " Electronic and magnetic properties of SnO2/CrO2 thin superlattices" doc
... a magnetic moment of μB per chromium atom, which is independent of the number of monolayers As the FM rutileCrO2 is unstable at ambient temperature, and known to be stabilized when on top of ... Abbreviations AFM: anti-ferromagnetic; FM: ferromagnetic; GGA-PBE: generalized gradient approximation and the Perdew, Burke, and Ernzerhof; NM: non -magnetic; PDOS: projected density of states; SL: superlattice; ... Density of states and total energies for the SL with n=10 (a) Total density of states (in black) and project density of states (in gray) for the Cr–3d (b) Total energies for the non magnetic...
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Báo cáo hóa học: " Synthesis and Magnetic Properties of Maghemite (c-Fe2O3) Short-Nanotubes" ppt
... structures The roomtemperature and low-temperature magnetic properties of these SNTs were investigated The study of pure c-Fe2O3 SNTs and their magnetic properties is a key issue, not only for practical ... exhibit weak ferromagnetic and soft magnetic behaviors [26] The structure of a-Fe2O3 can be described as consisting hcp arrays of oxygen ions stacked along the [001] direction Two-thirds of the sites ... unless the magnetic properties of magnetic materials are improved [39] Conclusions The approach used in this study provides a simple and inexpensive method for the preparation of stable and magnetic...
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Báo cáo hóa học: " Aqueous Solution Preparation, Structure, and Magnetic Properties of Nano-Granular ZnxFe32xO4 Ferrite Films" potx
... Izaki’s method, the incorporation of Zn into magnetite was finished by the deposition of magnetite film on ZnO thin film, so the Zn content of ferrite film and the magnetic properties cannot be well adjusted ... composed of fine Ag nano-granules of 1–10 nm in size The surface of the Ag layer possesses the large surface area of the fine Ag nano-granules Heterogeneous nucleation is promoted by the presence of ... sites, so the net magnetic moment of the ZnxFe3-xO4 spinel unite cell is the difference in the magnetic moment between B and A sites [28, 29] Therefore, the net magnetic moment m of the ZnxFe3-xO4...
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báo cáo hóa học:" Synthesis and Magnetic Properties of Nearly Monodisperse CoFe2O4 Nanoparticles Through a Simple " docx
... as-synthesized CoFe2O4 nanoparticles under an applied magnetic field of 100 Oe than that of the K values of bulk CoFe2O4 [(1.8–3.0) 106 ergs/cm3] The distribution function of the magnetic anisotropy ... surface of CoFe2O4 The peak at 3,007 cm-1 is assigned to the Fig TEM image of the as-synthesized CoFe2O4 nanoparticles 1041 Fig FTIR spectra of the as-synthesized CoFe2O4 nanoparticles stretching of ... (6 mmol) of FeCl3Á6H2O and 0.7 g of (3 mmol) CoCl2Á6H2O were dissolved in the solvent composed of 80 ml of water and 40 ml of ethanol After that, 7.3 g (24 mmol) of sodium oleate and ml of oleic...
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Báo cáo hóa học: " First-Principles Study of Magnetic Properties of 3d Transition Metals Doped in ZnO Nanowires" potx
... the defect formation energies of transition metals in ZnO nanowires and bulk, and the magnetic coupling properties of the TMs in the two systems A brief summary of the letter is given in Sect ... theoretical analysis To further understand the origin of ferromagnetism of TMs in the ZnO nanowire, we also plot the density of states (DOS) of 3d levels of the FM and AFM states in Fig for the two Cr ... DMSs is important for their applications, it is of great interest to investigate the chemical trends of defect formation and magnetic couplings of TMs doped in the ZnO nanowire theoretically In...
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Báo cáo hóa học: "Synthesis, structure and magnetic properties of b-MnO2 nanorods" pptx
... significantly their magnetic response, which can be explained as a superposition of bulk magnetic properties of the spatially segregated constituent manganese-oxide phases and the magnetism of the thin ... (~2.5 nm) surface layer of a-Mn2O3 phase with a reduced Mn valence state We also present magnetic properties of the b-MnO2 nanorods and demonstrate the important role of the surface layer in ... independent of the magnetic field, followed by a decrease of Fig (Color online) (a) Atomic-resolved HRTEM image of a b-MnO2 nanorod, showing that the b-MnO2 single-crystalline material in the interior of...
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Electronic and magnetic properties of alkali and alkaline earth metals doped AIN bulk to surfaces
... influence of surface effects on the electronic and magnetic properties of magnetic semiconductors at the low-dimension Thus to identify the origin of magnetism and enhance the applications of magnetic ... of Tables 4.1 Charge and magnetic moment (µ) of high spin polarized N atoms surrounding Mg of both Mg doped AlN (10¯ and Mg doped AlN (11¯ 10) 20) surfaces µ is the magnetic moment in units of ... level diagrams of ferromagnetic coupling (a) and antiferromagnetic coupling (b) of K doped AlN 48 3.7 Total DOS of Be doped AlN 49 4.1 Modelling of (10¯ surface...
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Investigation of electronic and magnetic properties of pristine and functionalized graphene
... showing the temperature variation of magnetization of HEpG; (b) Magnetic hysteresis (in unit of Bohr magnetons per benzene ring) of HEpG at 300 K after subtracting the diamagnetic background ... (secondary electron cutoff) during the deposition of MoO3 on EpG Spectra are measured with photon energy of 60 eV b The plot of the sample work function and C 1s of EpG as a function of the MoO3 xii ... All of these carbon materials have been used in many applications much earlier before graphene emerged, yet many of their electronic and magnetic properties originate from the properties of graphene...
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