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Magnetic properties and thermal stability of (Fe,Co)-Mo-B-P-Si metallic glasses
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Image of FIG. 1.
FIG. 1.

(a) Differential scanning calorimetric curves for (Fe1-x Co x )78Mo1B21-y-z P y Si z alloys with x = 0 and {y,z} = {0,6}, {6,2}, {6,6}, and {6,10}. The upward and downward arrows indicate T c and T g , respectively. (b) Ternary diagram showing the ΔT x dependence (in K) on metalloid composition in the Fe78Mo1(B,P,Si)21 alloy series, with compositions indicated as {y,z}.

Image of FIG. 2.
FIG. 2.

Glass transition (T g ) and crystallization temperatures (T x ) plotted against the phosphorus content of the alloy (y). Difference between the curves is ΔT x , which ranges from about 50 (at y = 0) to about 40 (at y = 10).

Image of FIG. 3.
FIG. 3.

Partial time-temperature-transformation (TTT) diagram of (a) Fe78Mo1B13P6Si2 (i.e., {0,6,2}) and (b) Fe78Mo1B15Si6 (i.e., {0,0,6}) metallic glasses in the SCL region. The single-phase amorphous and mixed crystalline/amorphous phases are marked in these diagrams with square and circle symbols, respectively. (c) The comparison of crystallization of the two alloys plotted on the same diagram.

Image of FIG. 4.
FIG. 4.

A characteristic hysteresis loop for the Fe78Mo1B15Si6 (i.e., {0,0,6}) sample, measured at room temperature with a maximum applied field of 72 kA/m. The inset shows an enlargement of the loop near zero field to highlight the coercivity.

Image of FIG. 5.
FIG. 5.

(a) Saturation magnetization (μ 0 M s ) as a function of average magnetic valence for the Fe78Mo1(B,P,Si)21 alloy series. (b) Saturation magnetization plotted against Co content in the (Fe1-x Co x )78Mo1B21-y-z P y Si z alloy series with {y,z} = {0,6}, {6,2}, {6,6}, and {6,10}. For comparison, data from the (Fe1-x Co x )80B20 and (Fe1-x Co x )78Mo1(C,B,P,Si)21 alloy series are plotted from Refs. 22 and 25, respectively.

Image of FIG. 6.
FIG. 6.

(a) Curie temperature (T c ) plotted against the average metalloid atomic radius for the Fe78Mo1(B,P,Si)21 alloy series. Atomic radii are marked for the metalloid atoms B, P, and Si. (b) Curie temperature variation with Co content for the full series of alloys studied.

Image of FIG. 7.
FIG. 7.

Core loss plotted against switching frequency for the alloy Fe78Mo1B15Si6 at magnetic induction amplitudes from 100 to 1000 mT. (a) Sine waveform, (b) square waveform.

Image of FIG. 8.
FIG. 8.

Core loss plotted against maximum induction amplitude at a switchingfrequency of 20 kHz (sine waveform) for Fe78Mo1B15Si6,Fe78Mo1B13P6Si2, (Fe0.85Co0.15)78Mo1B15Si6, and (Fe0.85Co0.15)78Mo1B13P6Si2.


Generic image for table
Table I.

Summary of Curie temperature (T c ), glass transition temperature (T g ), onset temperature of crystallization (T x ), saturation magnetization (μ 0 M s ), and coercive field (Hc) for as-spun (Fe1- x Co x )78Mo1B21-y- z P y Si z metallic glasses. The values of T g of some metallic glasses could not be obtained from DSC signals due to close proximity to T c .

Generic image for table
Table II.

Summary of coefficients for the power-law relationship between core losses (P cv ) and maximum magnetic induction amplitude (B max ). The Steinmetz exponent (n) and power-law prefactor (P 0 ) are reported for alloys measured by AC core loss measurements on toroidal-shaped cores using sine and square waveforms. Steinmetz equation: .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic properties and thermal stability of (Fe,Co)-Mo-B-P-Si metallic glasses