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In this work, magnetic properties of melt-spun B-rich (10 at%) and Nb/Ta-containning nanocomposite alloys based on the formula (Nd0.75Pr0.25)y(TM)90-y-xMxB10 (TM=Fe, Fe0.90Co0.1, M=Nb, Ta; y=8, 10; x=0,2,4) were determined by means of VSM measurements. Nanocomposite alloys were obtained from devitrification of initially fully amorphous precursors. Considerable enhancement of the intrinsic coercivity...
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...
In this paper, the recording performance of two types of media are compared by calculating the head field distribution of an 80 nm wide write pole in conjunction with a soft magnetic underlayer. The maximum effective field was inclined 15deg from the perpendicular axis. The effective head field gradient was a maximum when the head field was inclined 35deg from the perpendicular. Composite media have...
This paper presents detailed micromagnetic analysis of the magnetization reversal characteristics and recording properties and comparison with the conventional granular perpendicular media (GPM) will be discussed. The percolated perpendicular media (PPM) consists of exchange coupled magnetic grains with strong perpendicular anisotropy and, more or less uniformly and relatively densely distributed...
This paper presents the first quantitative evaluation of the pinned uncompensated spin (UCS) density on the scale of single grains obtained from high lateral resolution magnetic force microscopy. All measurements presented were performed on one ferromagnetic-antiferromagnetic (FM/AFM) multilayer sample that contained a Co/Pt multilayer as ferromagnetic layer and CoO as an AFM layer. TEM of the CoO...
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...
In order to shed light on the magnetization reversal mechanism of CGC perpendicular recording media, the authors have carried out investigations of its activation volume, the angular dependence of Hc, cluster size and the physical grain size.
In this study, the activation volumes of perpendicular recording media with dispersions of grain size have been analyzed using Voronoi lattice by micromagnetic simulation. An array of polygonal prism grains with perfect mirror image for soft underlayer (SUL) was used to simulate a section of a perpendicular recording medium. Thermal activation volume was obtained from the difference of the magnetization...
In the present study, the switching field distribution (SFD) of the Tb/Pt/Ru/CoPtCr-SiO2 perpendicular media has been studied in relation to the Ar pressure at which the recording layer was deposited. The goal of the present study is to correlate the SFDs of the Tb/Pt/Ru/CoPtCr-SiO2 media with their intergranular exchange coupling and their grain size distribution.
La(Fe0.88Si0.12)13 and their hydrides show a large magnetocaloric effects which make them the primary candidate for the working materials for a near room temperature magnetic refrigeration.In this paper, structure and magnetocaloric effects of rapidly solidified La(Fe0.88Si0.12)13 alloys after short heat treatments are Rapidly solidified La(Fe0.88Si0.12)13 alloys were prepared using both a melt spinning...
The authors studied the influence of microstructure and grain size, as well as Curie temperature, on the low-temperature aged Sm(Co0.45Cu0.4Fe0.15)5 alloy in relation to enhanced coercivity. Melt-spinning has been employed in order to achieved a wide range of grain sizes from micro- to nanometer level. XRD and TEM analysis were used to study the structure of as-spun ribbons and SQUID magnetometer...
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