Magnetic properties of Fe76X2Si8B14 (X=Al, Cr, Mo) amorphous alloys (original) (raw)
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Journal of Applied Physics, 2004
The magnetic anisotropy induced in amorphous magnetic ribbons by applying a magnetic field to the melt during the solidification process is analyzed. Using a model based on the magnetization curve and on the evolution of the uniaxial torque with the applied magnetic field, the volume fractions of the sample affected by the different magnetic anisotropies are obtained for the ribbons of composition Fe 80 B 20 and Co 70 Mn 5 Fe 1 Mo 1 Si 14 B 9 . The results are compared with those obtained in the ribbons of the same composition but with anisotropies induced by the static magnetic annealing. From these results, the different sources of the field-quenching-induced magnetic anisotropy in those amorphous magnetic ribbons are analyzed.
Magnetic materials for technical applications
Journal of Optoelectronics and Advanced Materials
The time evolution of the physical properties of hard and soft magnetic materials is shortly reviewed. Then, we analyse the magnetic properties of Nd5Fe67Cr8Nb2B18 nanocomposites, Nd-Fe-Co-Al-B hard magnetic phases and magnets as well as of Nd2Fe14-xMxC0.8B0.2 (M=Ni, Cu and Al) alloys. Some data on soft magnetic materials are also given. Finally, the magnetocaloric properties of ternary Gd-Co-B compounds are reported. Hard and soft magnetic materials, Magnetocaloric effect a) based on lecture given at MATEHN International Conference
Magnetic characterization of soft magnetic materials—experiments and analysis
Journal of Magnetism and Magnetic Materials, 2003
Various kinds of magnetic measurement methods suited for soft magnetic materials are critically surveyed. Emphasis was laid on AC-susceptibility methods, the hysteresis loop and the magnetostriction. The analysis of the temperature dependence of the magnetization and the magnetostriction is demonstrated on the amorphous system Fe-Co-B. r
Magnetic characterization of Fe-Al-B amorphous ribbons obtained by the melt spinning technique
EPJ Web of Conferences, 2011
The magnetic properties of a new amorphous material obtained by melt spinning technique is presented. The composition of the ribbon is Fe 72 Al 14 B 14. The bulk hysteresis loops indicates that this ribbon is a soft magnetic material with a magnetic anisotropy along the longitudinal direction of the ribbon and an anisotropy constant of 1860 Jm-3. The value of the anisotropy is explained on the basis of the formation of directional order. The saturation magnetization results 1.12 T and the coercive field 18 Am-1. The surface magnetic properties show that the magnetic anisotropy is higher in the wheel-surface than in the air-surface. This result is explained considering the residual stress distribution in this kind of materials.
Journal of Bangladesh Academy of Sciences, 1970
Structural and magnetic measurements have been performed on the FINEMET type of ribbons with nominal composition of Fe 74 Cu 0.5 Nb 3 Si 13.5 B 9 synthesized by rapid solidification technique. The crystallization behavior and the nanocrystal formation have been studied by differential thermal analysis (DTA) and X-ray diffraction (XRD). The crystallization onset temperatures determined by XRD are in good agreement with DTA results. Magnetic permeability and magnetization measurements have been carried out using inductance analyzer and vibrating sample magnetometer (VSM). Magnetic permeability sensitively depends on the annealing temperature which increases sharply with the increase of annealing temperature. Maximum permeability corresponding to optimum annealing temperature (T a) was observed at T a = 575°C. Saturation magnetization, M s, increases with T a for the sample and finally decreases for annealing at a temperature much higher than peak crystallization temperature. The results show that the amounts of Cu and Nb are very important for the soft magnetic properties of FINEMET alloys.
Magnetic properties of Co-based amorphous ribbon under cyclic heating and cooling
ISSUES, 2010
Purpose: The aim of the work is to investigate the changes of magnetic properties of the cobalt based Co68Fe4Mo1Si13.5B13.5 alloy under cycling heating and cooling. Design/methodology/approach: The amorphous metallic ribbons were manufactured by planar-flow-casting method. Investigations of the magnetic properties were observed under permanent heating amorphous and partially crystallized alloy. Observations of the structure were made on the JOEL transmission electron microscope (TEM). Using the HFQS program the distributions of the magnetic hyperfine P(H) fields were determined for spectra smoothed in this way, employing the Hesse-Rübartsch method. Findings: The analysis of the magnetic properties under permanent heating and structure of the Co-based amorphous ribbons obtained in the by planar-flow-casting process proved that the permanent heating caused the crystallization of second magnetic phase after transition near to paramagnetic state. Research limitations/implications: The appropriate cyclic heating and cooling significantly decreasing soft magnetic properties of examined amorphous alloy. The cyclic heating beginning of elementary crystallization processes and the end of crystallization alloy. Practical implications: According to the results presented in the paper the examined Co-based glassy alloys as a soft ferromagnetic material may be utilized in construction of magnetic cores such as choke coils, common mode and noise filter and is of great technological interest. Originality/value: The paper presents influence of permanent heating on structural changes of metallic ribbons. Results and discussion of the influence of permanent heating on magnetic properties of metallic ribbon are presented.
Archives of Metallurgy and Materials
The results of microstructure and magnetic properties studies of the amorphous Fe 73 Me 5 Y 3 B 19 (where Me = Ti or Nb) alloys are presented The samples of the investigated alloys were produced in the form of ribbons with thickness of approximately 30 µm by unidirectional cooling of the liquid material on a rotating copper wheel. Both investigated alloys, in the as-quenched state, were fully amorphous which was verified using a 'Bruker' X-ray diffractometer. Static hysteresis loops, measured using 'LakeShore' vibrating sample magnetometer (VSM), were typical as for soft magnetic ferromagnets. The Fe 73 Nb 5 Y 3 B 19 and Fe 73 Ti 5 Y 3 B 19 alloys were characterized by relatively high values of saturation of the magnetization (1.25 T and 1.26 T, respectively) and low coercivity field (16 A/m and 47 A/m, respectively). The core losses obtained for the investigated alloys were significantly lower than for commercially used FeSi transformer steels. Both alloys also exhi...
Magnetoelastic effects on practical properties of amorphous ribbons
IEEE Transactions on Magnetics, 1986
Magnetoelastic effects are abserved on Epstein Sample of Metglas 2605S2 when additional weights are used t o reduce the gap at the corner joints of the magnetic path.; The measured degradation of the apparent power is important though the exerted pressure remains lower than 4 kPa. This effect is explained taking into account the ribbon shape which is not perfectly f l a t , The weights submit the end of the strips to considerable bending stresses responsible for the magnetic properties degradation. By flattening the sample d w f w annealing the weight influence is largely reduced.
Archives of Metallurgy and Materials, 2012
Microstructure and Soft Magnetic Properties of Fe61Co10Y8Me1B20(Where Me = W, Zr or Nb) Amorphous AlloysThe microstructure and the soft magnetic properties of the multi-component Fe61Co10Y8Me1B20amorphous alloys (where Me = W, Zr or Nb) have been investigated; the samples were in the form of ribbons of 3 mm width and 30 μm thickness. The samples were produced using a single-roller melt-spinning method. The alloy composition was investigated using an X-ray diffractometer. The amorphous nature of the entire volume of all the as-quenched samples was confirmed. From the magnetic measurements performed using the ‘LakeShore’ vibrating sample magnetometer, magnetic parameters such as: coercivity, saturation of the magnetization for the as-quenched samples were derived. All of the investigated alloys displayed good soft magnetic properties, making them perfect materials for magnetic cores. The core losses for different values of magnetic field and operating frequency were also measured. It ...