magnetic properties of solids

... 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...

Ngày tải lên: 13/02/2014, 03:20

... 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 ... in an increasing magnetic moment per formula of Ni1-xCoxFe2O4 and equivalently, an enhancement of magnetization [7].The dependence of saturation magnetization Ms as a function of Co2+ concentration...

Ngày tải lên: 13/02/2014, 04:20

... Magneto-optical properties of magnetic multilayers 2.2.1 Magneto-optical properties of Co/Pd systems 2.2.2 Magneto-optical properties of Co/Pt multilayers 2.2.3 Magneto-optical properties of Co/Cu multilayers ... physical properties of layered structures including the MO properties Chapter of the book presents the MO properties of f band ferromagnetic materials Sections 3.1 devoted to the MO properties of 4f ... MO properties of elemental ferromagnetic metals (Fe, Co, and Ni) and paramagnetic metals in external magnetic fields (Pd and Pt) Also TLFeBOOK xii ELECTRONIC STRUCTURE AND MO PROPERTIES OF SOLIDS...

Ngày tải lên: 17/03/2014, 14:51

... 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...

Ngày tải lên: 20/03/2014, 13:08

... 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...

Ngày tải lên: 23/03/2014, 17:22

... studies of electronic properties of solids If we think of the optical properties for various classes of materials, it is clear from Fig 3.3 that major differences will be found from one class of materials ... produce a force in another direction because of the anisotropy of the constant energy surfaces in solids Because of the anisotropy of the effective mass in solids, j and E are related by the tensorial ... Chapter Absorption of Light in Solids References: • Ziman, Principles of the Theory of Solids: Chapter • Bassani and Pastori–Parravicini, Electronic States and Optical Transitions in Solids: chapter...

Ngày tải lên: 24/04/2014, 17:13

Ngày tải lên: 13/05/2014, 09:07

... 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...

Ngày tải lên: 20/06/2014, 22:20

... 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...

Ngày tải lên: 21/06/2014, 04:20

... 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 ... is that of Co/InP nanocomposites Magnetic properties of Co/InP nanocomposites Figure shows field-dependent magnetization (M-H) curves of such Co/InP nanocomposites, where the applied magnetic ... 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...

Ngày tải lên: 21/06/2014, 04:20

... 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 ... 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 ... multiple branches because of the stronger anisotropic magnetic forces, and these findings are in agreement with those of our earlier article [17] Despite the presence of the amorphous buffer layer,...

Ngày tải lên: 21/06/2014, 04:20

... 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...

Ngày tải lên: 21/06/2014, 05:20

Ngày tải lên: 21/06/2014, 08:20

... 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...

Ngày tải lên: 21/06/2014, 17:20

... 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...

Ngày tải lên: 21/06/2014, 17:20

... 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...

Ngày tải lên: 21/06/2014, 18:20

... 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...

Ngày tải lên: 22/06/2014, 01:20

... 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...

Ngày tải lên: 22/06/2014, 22:20

Ngày tải lên: 14/11/2014, 07:13

... 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 ... in case of Sc2+ and Ti2+ ions [55], at least one of the orbital is empty and the hybridization favors ferromagnetic interaction The magnetic ordering in many of the solids is a result of competition ... 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...

Ngày tải lên: 09/09/2015, 08:12