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The aim of the paper is to study the structural properties of the FePt particles synthesized at 200deg and 300deg C by using the XRD and XAFS techniques and the mechanism behind partial ordering has been proposed.
Ferrite/polymer composites were prepared by mixing ferrite powders with epoxy resin. The powders are W-type barium ferrites BaCoxZn2-xFe16O27 (x=1.0, 1.3 and 1.5) doped with V2O5 of 0-1.5 wt%. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure spectroscopy (EXAFS), scanning electron microscope (SEM), electric resistivity, static and high-frequency...
In this paper, nonmagnetic elements (Al and Cu) doping effect on the structural and magneto-transport properties of Zn0.85Mn0.15O (ZnMnO) dilute magnetic semiconductors were reported. The structural characterization was performed using XRD, Raman spectroscopy, AFM and SEM. Temperature dependent electrical resistivity, Hall effect, and were carried out using a standard magneto-transport set-up.
The FePt film prepared by ion beam sputtering with nitrogen gas in addition to the Ar gas transforms into the ordered fct structure at a faster rate as compared to that film prepared only with Ar gas. Mossbauer studies, X-ray reflectivity (XRR), and X-ray diffraction (XRD) characterization shows that at high temperature annealing, the present nitrogen escapes creating voids which play a significant...
The structure and magnetism and their correlation for the NiAs-type Mn50(Te50-xSbx) (NA-MTS) pseudo-single crystal films. The composition of the films was determined by X-ray fluorescence analysis. The crystal structure was investigated by XRD method. The magnetic properties such as saturation magnetic moments, magnetic transition temperatures and saturation magnetization were measured by a SQUID...
In this paper, the microstructure and magnetic properties of the Fe3B/(Pr,Tb)2Fe14B nanocomposite permanent magnets obtained from melt-spun powders with composition of Pr4.2Tb0.3Fe78B17.5 by applying spark plasma sintering (SPS) was discussed. Since the magnetic properties such as remanence (Br) and coercivity (Hci) will deteriorate dramatically due to excessive grain growth during sintering process...
The magnetic properties and microstructure of FePt film on island-like Ge3Pt2 were studied in this paper. The surface morphology of GePt underlayer on different deposition temperature were discussed and the island-like GePt-FePt underlayer was explored. The structural analysis were done by TEM, grazing incident XRD, and FESEM with EDS attachment. Magnetic hysteresis were measured at room temperature...
Multilayered Co/Pd nanowire array were obtained from atomic image projection electron beam lithography (AIPEL) and combined novel etching technique using amorphous Si layer. The role of dipolar interaction in magnetic anisotropy of the nanowire array was studied. The structural information were obtained by HR-TEM, XRD, SEM and AFM. The magnetic properties were measured by SQUID and vibrating sample...
We present here our results on the synthesis and characterization of transition metal (TM) doped-ZnO nanocrystals, where (TM= Co, Ni, Fe, Cu and Cr). Stable suspensions of these materials were produced in ethanol solution at room-temperature condition. liquors. XRD characterization of doped systems confirmed the exclusive formation of the host ZnO wurtzite structure. The incorporation of dopant species...
This article presents experiments on the magnetic characterisation of quaternary Heusler alloys for spintronic applications. In this work, polycrystalline Co2Cr1-XFeXAl (CCFA), Co2Cr1-XVXAl (CCVA) and Co2V1-XFeXAl (CVFA) bulk alloys were prepared by arc melting for mictrostructural, magnetic, and spin polarised properties. Magnetic measurements were carried out using VSM and SQUID magnetometry. Material...
In this study, PtMn nanoparticles were synthesized via a chemical method. After post-annealing at the temperature range of 500~700degC, different grain sizes were obtained. It was found the coercivity, measured at 5 K, decreased with increasing grain size. The exchange-bias was also observed at 5 K under a field-cooling process. The particle size and composition of as-synthesized PtMn nanoparticles...
This paper presents a new method for BaM thin films having a negative nucleation field, consequently high squareness of film. Bi-layered BaM thin films were deposited by rf sputtering with high purity Ar and O2 gases on single crystal sapphire (000l) substrates. The bi-layer is composed of amorphous as a top layer and crystalline BaM films. A three-step rapid temperature annealing (RTA) was performed...
CoCrPt-SiO2-based perpendicular recording medium with a crystalline soft underlayer (c-SUL). Low Deltathetas50 of about 3 deg with a thin intermediate layer of 5 nm has been made in this media. In this paper, we report the orientation improvement, noise reduction of c-SUL and recording performance of the media. The magnetic properties and microstructure were characterized by magneto-optic Kerr effect...
Ba (Sc)-hexaferrite has great potential in industry as a material for self-biased nonreciprocal devices operating at microwave frequencies below 18GHz ((D.B. Nicholson), (G.F. Dionne and J.F. Fitzgerald, 1991),(A Gruskova, 1994), (M.A. Tsankov and L. G. Milenova, 1993), (Cham Kiong Queck and L.E. Davis, 2003)). Here, we synthesized pure Ba(Sc)-hexaferrite by using conventional ceramic method followed...
The authors synthesized ultra-small magnetite (Fe3O4) nanoparticles using aqueous coprecipitation. The crystal structure of the samples was analyzed by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The magnetic properties of the magnetite nanocrystals were investigated using a SQUID magnetometer.
In the present study we show two variations of the bottom-up approach. First our correlated structural and magnetic properties studies on epitaxial FePd films grown on (001) MgO will show that this particular system does exhibit perpendicular magnetic anisotropy and it is also nano-structured due to 3-dimensional growth mode on the chosen substrate. We also note here that the highly-ordered nanostructures...
In this paper, the characteristics of the osmium (Os) in textured CoFe/IrMn magnetic film multilayer structure system is investigated and the characteristics of buffer layer and diffusion barrier is also reported. To examine the magnetic behavior, magneto-optical Kerr effect (MOKE) and vibrating sample magnetometer (VSM) are used and XRD is used to examine the crystal structure. As a result, a textured...
This paper reports the magnetoelectric properties of CoFe2O4-BaTiO3 core-shell structure composites. Crystalline structures of the composites were investigated by X-ray diffractometer (XRD). Magnetic properties were studied using a pulse field magnetometer. Magnetostriction was measured using strain gauge method. AC susceptibility and ME coefficient were investigated using lock-in technique in which...
Recently gold/iron oxide composite nanoparticles have attracted much attention as promising biomedical materials. In this paper, a novel laser soldering method called 'nano-soldering' is employed to prepare gold/iron oxide composite nanoparticles. The structural properties were examined by X-ray diffractometry (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy...
In this study, granular films were prepared by reactive RF magnetron sputtering. The film was deposited on Si (100) substrates. The magnetic properties (coercivity) were measured by a vibrating sample magnetometer (VSM). The electrical resistivity (p) of the thin film was determined by means of a four-point probe method. The film structures were investigated by X-ray diffractometry (XRD) and transmission...
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