Saturation induction

Pr,Sm)Co magnets have higher values of saturation induction than SmCo, but are produced only in a limited way. The Sm—Ce and Sm—CeMM combinations lower the magnetic properties, but the price of raw materials is lower. 

Material Initial Susceptibility (/ at H 0) Hysteresis Loss per Cycle (J/m ) Saturation induction (Wb/m )... 

Alloy Composition Saturation induction, fly, T Coercive force Hc. A/m Magnetostriction. A. x 10 ft... 

Saturation induction (saturation flux density) Bs > 2.0 T (/i well above that... 

Coercivity - The maximum value of coercive force that can be attained when a magnetic material is symmetrically magnetized to saturation induction. [10]... 

FeCo - in particular with a 2 % V addition - has found widespread use as a magnetically soft material with a high saturation induction, e.g. as electromagnet pole tips, and the respective alloys are known as Permendur alloys (Chen, 1961 Kouvel, 1967 Dietrich, 1990). These alloys also exhibit a high, positive magnetostrictive co-... 

In SMPSs (see Section 5.3), a high-frequency transformer is essential. For working frequencies up to 100 kHz, amorphous materials have losses comparable to those of ferrites, but possess higher saturation induction. 

M H = 0) = Msj 0 due to residual field-induced domain orientation. The shape of the rest of the loop (curves b, c) is similar to that of single-domain ferroics (see Fig. 1.1). This shows the possibility of transformation of multidomain ferroic into single-domain one by the external field. One can see from Fig. 1.2, that for soft iron the coercive field is about 1 Gs, the saturation induction is Bs = 15,000 Gs and spontaneous magnetization is about two times smaller. In general case these parameters depend essentially on the specific material properties. 

As a way to stabilize metallic magnetic phases, metal alloys have been prepared. In particular, iron-cobalt alloys have attracted much attentiOTi due to their technological relevance to magnetic storage. In the bulk they are soft magnetic materials with saturation induction 15% larger than pure iron and with magnetizatiOTi values dependent on their composition. 

Fig. 27. (Upper panel) Lattice parameters a and c, (middle panel) Curie points Tq, and (lower panel) saturation induction, versus Co concenfiation x in Sm(Fei, iCOj)H all( (Andreev et al. 1989). Note that, contrary to results of Ohashi et al. (1988b) the single-phase range exists for x < S only. The Curie points obtained by Ohashi et al. (1988b) are slightly higher than that presented in this figure, excqtt for x=0, where the value shown in the figure is apparently higher. Results of Sola et al. (1990) (diamonds) are also similar.

Saturation induction depends only on the ferromagnetic atoms present in the materials and is not structure sensitive. 

Ferroresonant transformers exhibit unique voltage-regulation characteristics that have proved valuable in a wide variety of applications. Voltage output is fixed by the size of the core, which saturates each half cycle, and by the turns ratio of the windings. Voltage output is determined at the time of manufacture and cannot be adjusted. The secondary circuit resonance depends upon capacitors, which work with the saturating inductance of the device to keep the resonance active. A single-phase ferroresonant transformer is shown in Fig. 10.155. 

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