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A detailed characterization and analysis of the microwave properties of a set of nanogranular (Fe0.7Co0.3)71B22Ni7 films under an applied magnetic dc field ranging from 0 to 45 kA/m is presented. A full microwave characterization of the films is performed up to 20 GHz using a vector network analyzer (VNA) connected to a matched microstripline or coplanar waveguide, loaded with the films. The evolution...
The domain wall dynamics during magnetization reversal process of glass-coated amorphous Fe77.5Si7.5B15 bistable microwire was considered. Its domain structure deriving from the magnetoelastic and shape anisotropies consists of an axial single domain and two closure domain structures at the ends, plus an outer radial-helical shell in its surface. This articles report the measured domain wall velocities,...
Amorphous Fe73.5Cu1Nb3Si15.5B7 ribbons that are 2 mm wide and 20 mum thick were prepared by the continuous stress annealing-Joule heating (CSA-JH) method in air under tensile stresses of 50 to 175 MPa. Processing parameters such as the supplied current density and the moving velocity were varied. The ribbons were annealed at various conditions, and the relationship between the developed anisotropy...
The aim of this paper is to investigate FeCuSiBNb nanocrystalline microwires as an alternative to amorphous Co-based high-permeability microwires. The anisotropy is determined through static characterization from 20degC to 250degC using a VSM (Vibrating Sample Magnetometer). The properties are comparable in term of softness, but are superior in terms of saturation magnetostriction and thermal stability...
In this study, we investigated that both magnetic switching and tunneling magnetoresistance (TMR) ratio of MTJs with the NiFeSiB free layer. The junctions were fabricated by a photolithographic patterning procedure and ion beam etching. A magnetic field of 100 Oe was applied during deposition to induce the uniaxial magnetic anisotropy in ferromagnetic layer.The NiFeSiB layers were used to substitute...
Summary form only given. This paper focuses on the possibility of direct casting miniature NdFeB-based bulk permanent magnets in different three-dimensional shapes for various applications, with amorphous structure followed by subsequent optimal annealing. Nd3Dy1Fe66Co10B20 bulk nanocomposite permanent magnets in form of rods with diameters ranging from 0.5 to 0.8 mm have been prepared by devitrification...
Thick NdFeB films have been prepared by triode sputtering with a deposition rate of 20 mum/hour. Films were deposited on either "cool" substrates or onto substrates heated in the range 300-500degC and then annealed at 750degC for 10 minutes. Magnetic characterisation was carried out at room temperature with an extraction magnetometer in fields of up to 10 T. Microstructures were observed...
In this report, the magnetic microstructures of the melt-spun(Fe0.55Pt0.45)78Zr2B20 and (Fe0.55Pt0.45)78Zr4B18 in as-quenched state were investigated by Lorentz microscopy and electron holography. The in-plane component of the magnetic flux was visualized by analyzing the phase shift of the electrons traversing the specimen by using the Fourier transform for digital holograms. An ex situ observation...
The soft under layer (SUL) is used to improve write head filed strength, field gradient and read-back signal in perpendicular magnetic media. In this study, four type SUL structures were fabricated. Samples were post-annealed and cooled to room temperature under magnetic field along radial direction. VSM, MFM and Guzik spin stand were used to analyze the magnetic properties, domain structure and noise...
A cantilevered actuator is fabricated in this study by sputter deposition using amorphous Fe72Si14B14 as the magnetostrictive material. The displacement of the cantilever is observed with applying the magnetic field of 10 kA/m to the width direction of the cantilever. Results show that the displacement of the cantilever increased with decreasing substrate thickness, and has a peak value at the thickness...
The magnetic properties bulk nanograin composite Nd-Fe-B/Fe-Co magnets is enhanced reducing the size and improving the distribution of the soft phase throughout the magnet. This was achieved through various coating technologies applied to coat melt-spun micrometer-sized Nd-Fe-B powder particles with thin alpha-Fe or Fe-Co layers. These coating techniques include sputtering, pulsed laser deposition,...
In the present study, the enhanced magnetic properties of Nd-Fe-B sintered magnet pieces treated with the Dy or Tb metal as reduced by heating their oxides or fluorides with CaH2 are reported together with the results obtained on the samples simply coated and heated with the oxide or fluoride of Dy and Tb elements and the mechanism for enhancing the coercivity is disscussed to produced much powerful...
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