By Alex Goldman
Revision of a vintage reference on ferrite technology
Includes basics in addition to purposes
Covers new components such as nanoferrites, new excessive frequency strength provide fabrics, magnetoresistive ferrites for magnetic recording
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Because the low Ms conflicts with the need for high remanence, a compromise is usually adopted. The field created from the residual strong poles forms a permanent magnet. Because of a strong uniaxial anisotropy, the coercive forces of permanent magnet materials are quite high ranging from about 500 oersteds for Alnico to 3,000 or higher for other materials. In the case of hard ferrites, the remanence is low because the saturation is so much lower than it is for metals. However, the coercive forces for hard ferrites are much higher than Alnico.
M. N. Ferrites, Proc. ICF6, Jap. ,of Powder and Powd. (1907) J. [4] 6,661 3 AC PROPERTIES OF FERRITES INTRODUCTION In the previous chapter we discussed how the hysteresis loop can literally be called the signature of a magnetic material. We have produced this loop by slowly applying a direct current (DC) field in one direction, saturating the material, reducing the field slowly to zero, reversing the field and repeating the same procedure. The loop we get is called the DC hysteresis loop. DC loops are important for studying the basic properties of a material and are also used in permanent magnet materials design since its operation is equivalent to a DC field.
If we stop part of the way up and then reduce the field to zero and repeat the process to the same value of reverse field the result is a minor loop. 10 along with the saturation loop. 30 MODERN FERRITE TECHNOLOGY PERMEABILITY We previously defined the susceptibility as the ratio of M to H. For paramagnetics and diamagnetics, this parameter is quite useful. 10 A minor hysteresis loop with the saturation loop which is the ratio of induction, B to magnetizing field, H. However, this parameter can be measured under different sets of conditions.