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In the usual technique for the display of ferroelectric hysteresis loops, the specimen is excited from a sinusoidal a.c. voltage source, signals proportional to D and E are derived and these are respectively applied to the vertical and horizontal deflection plates of a cathode ray oscilloscope. Ordinarily, the frequency of excitation is 60 c.p.s., the choice being purely one of convenience. Actually,...
In the present section, attention is confined to ferromagnetic materials that are nonmetallic. The materials dealt with are characterized by a resultant spontaneous moment that ordinarily is due to an uncompensated antiferromagnetism. Such substances are more properly designated as ferricmagnetic.
In the present section, attention is confined to ferromagnetic materials that are nonmetallic. The materials dealt with are characterized by a resultant spontaneous magnetization that ordinarily is due to an uncompensated antiferro-magnetism. In Néel's terminology substances of this type would be described as “ferrimagnetic”. We shall make no particular effort to employ this special terminology, rather...
The measurement of dielectric properties in the microwave band is usually accomplished by placing the sample in a waveguide or resonant cavity. Free-space methods, while lacking the general versatility of waveguide techniques, exhibit certain advantageous features: the problem of maintaining a precision fit between the sample and the guide is avoided; certain structures, for example, “honeycomb” materials...
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