Measurements are reported of the loss per cycle (sinusoidal flux waveform) versus magnetizing frequency f/sub m/(0 >

General properties of power losses in soft ferromagnetic materials

https://www.andrew.cmu.edu/user/dl0p/laughlin/pdf/PMS.pdf

Amorphous and nanocrystalline materials for applications as soft magnets

Glassy metals not only exhibit technologically interesting properties, e.g. high fracture strength, excellent soft magnetic behaviour and good corrosion resistance, they also constitute ideal materials for the studies of low-temperature transport, critical behaviour and electrical properties of disordered metals. Considerable efforts at understanding their structure, atomic and electronic transport properties and low-temperature behaviour have been made. The author describes the nature of the glassy state, various quenching techniques and glass-forming alloys, and discusses structural models, experimental structural data and atomic transport properties including diffusivities and kinetics of structural relaxation, magnetic aging and crystallisation. The mechanical properties and magnetic behaviour are summarised, with emphasis laid on the influence of modification of these properties due to changes in structural and chemical disorder and states of magnetisation. Finally the electrical transport properties, spin wave excitations and critical behaviour, thermal and acoustic behaviour at very low temperatures, and chemical properties are presented.

REVIEW ARTICLE: Glassy metals

Fe-based bulk metallic glasses: Glass formation, fabrication, properties and applications

https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1243&context=ameslab_manuscripts

Review of Fe-6.5 wt%Si high silicon steel—A promising soft magnetic material for sub-kHz application

A new method was developed to measure the saturation magnetostriction of a thin amorphous ribbon. It is based on the use of small-angle magnetization rotation to measure the change in anisotropy field caused by the tensile stress. Measurements have been performed on Metglas 2826, 2605, and Co-Si-B amorphous ribbons. The maximum experimental error of the measurement was estimated to be about ±5 percent. It is shown that the sensitivity of the method depends on the shape anisotropy field. The estimated sensitivity was about 2 × 10-7for Metglas 2826 ribbon with 1.8 mm × 40 μm × 12 cm in dimensions.

/pdf/measurement-of-saturation-magnetostriction-of-a-thin-1djsgxyda3.pdf

Measurement of saturation magnetostriction of a thin amorphous ribbon by means of small-angle magnetization rotation

The effect of ordering on the magnetic properties such as magnetostriction, magnetic anisotropy, permeability, and coercive force of 6.5-percent silicon-iron alloy has been studied. The alloys were heat-treated at various temperature, and then quenched into oil. It was found that magnetostriction decreases with the growth of DO 3 structure and magnetic anisotropy decreases with the growth of B 2 structure. By oil-quenching from 500°C, permeability became a maximum and coercive force became a minimum. The effect is caused by the growth of DO 3 structure. The improvement of the magnetic properties of 6.5-percent silicon-iron alloy was attained by controlling the ordering in this alloy through the double heat treatment. The values obtained were maximum permeability μm = 52 000, initial permeability \mu_{i} = 4000 , and coercive force H c = 0.088 Oe measured at the maximum induction of 10 kG.

Effect of ordering on magnetic properties of 6.5-percent silicon-iron alloy

The induced anisotropy, Ki, was measured in cobalt-based amorphous alloys containing 4d and 5d transition metals. The value of Ki for (Co1-xTMx)0.9Zr0.1 (TM=Cr, Fe, Ni) alloys is much larger than that for metal-metalloid amorphous alloys, and shows a peak with increasing x. This behavior can be explained by the pair-ordering model, and the observed large Ki is attributed to strong pseudo-dipole interaction and weak non-magnetic interaction between magnetic atom pairs. Ki in (Co1-yZry)0.9B0.1 and Co1-yZr0.1MEy-0.1 (ME=Nb, Mo, W) alloys is also larger than that of metal-metalloid alloys, and decreases monotonically with increasing y. This decrease is closely related to the reduction of saturation magnetization, Ms, and the empirical low (Ki ∝Ms3.2) is obtained. These behaviors are also discussed in the framework of the pseudo-dipole interaction model.

Composition Dependence of Induced Anisotropy in Cobalt-Based Amorphous Alloys Containing 4d and 5d Transition Metals

It has been found that the amorphous powder of a transition metal - metalloid alloy can be prepared by the spark erosion technique. The powder consists of roughly spherical particles whose diameters are ranging from 0.5 μm to 30μm. The preparation procedure of the powder is described and its magnetothermal characteristics and the crystallization behaviours are discussed.

Magnetothermal characteristics of amorphous Fe-Si-B powder produced by spark erosion

The effect of nickel and manganese addition on the ductility and magnetic properties of 6.5% silicon-iron sheet has been studied. Ductility was studied by tensile tests and cold-rolling under various conditions. It was found that the nickel addition did not improve the cold-workability of the alloys. Alloys with 0.10-0.17% manganese can be cold-rolled from a thickness of 1 mm to less than 0.35 mm after hot-rolling with above 80% reduction at about 600-700°C and a subsequent annealing at 600°C for 1 h. This might be due to the small grain size caused by the manganese addition and the removal of internal stress without crystal growth by annealing at 600°C. The effect of nickel and manganese addition on the magnetic properties of 6.5% silicon-iron alloy is fairly small for nickel content of less than 4% and manganese content of less than 0.20%. A maximum permeability of 35 000 occurs at about 0.15% manganese content and at annealing temperature of 900°C for 20 h.

Effect of nickel and manganese addition on ductility and magnetic properties of 6.5% silicon-iron alloy

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