Download Introduction to magnetic materials by B. D. Cullity PDF

By B. D. Cullity

Creation to Magnetic fabrics, 2d version covers the fundamentals of magnetic amounts, magnetic units, and fabrics utilized in perform. whereas holding a lot of the unique, this revision now covers SQUID and alternating gradient magnetometers, magnetic strength microscope, Kerr impact, amorphous alloys, rare-earth magnets, SI devices along cgs devices, and different up to date subject matters. additionally, the authors have further a wholly new bankruptcy on details fabrics. The textual content offers fabrics on the functional instead of theoretical point, taking into account a actual, quantitative, measurement-based figuring out of magnetism between readers, be they expert engineers or graduate-level scholars.

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3, at the center of an infinitely long solenoid. 13% less than that produced by an infinitely long solenoid. The field variation in the radial direction is generally negligible. To achieve a higher field, it is preferable to increase n/L by winding the wire in two or more layers rather than to increase the current. Although H is proportional to i, the heat developed in the winding is proportional to i 2R, where R is its resistance. Thus doubling the number of layers and keeping the current constant will double H, R, and the amount of heat; whereas doubling the current will double H, but quadruple the heat.

The technique depends on the measurement of a frequency, which can be done to very high precision and accuracy. 2 Electronic Integrator or Fluxmeter By Faraday’s law, a changing magnetic flux w through a coil of N turns generates a voltage in the coil proportional to the rate of change of flux e ¼ ÀC2 N dw dt volt, (2:7) where in SI units C2 ¼1 and w is in webers or volt-seconds; in cgs units C2 ¼ 1028 and w is in maxwells. Time t is in seconds. 7 we obtain e dt ¼ ÀC2 N d w, (2:8) and integrating, ðt 0 e dt ¼ ÀC2 N ð f2 dw ¼ ÀC2 N Dw: (2:9) f1 An instrument to integrate the voltage from a search coil is called a fluxmeter.

04 in (1 mm) thick, have a central hole and a narrow radial slot and are insulated from each other by similarly cut sheets of thin insulating material. Each copper disk is rotated about 208 with respect to its neighbor, so that the region of overlap provides a conducting path for the current to flow from one disk to the next. The current path through the entire stack of disks is therefore helical, and the stack of disks acts as a solenoid. 2 FIELD PRODUCTION BY SOLENOIDS 29 Fig. 5 Sketch of a Bitter magnet solenoid.

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