. The Bell System technical journal . (a) (b) (c) Fig. 9—Powder-patterns for iron (McKeehan and Ellmore): (left) field outward;(middle) demagnetized; (right) field inward. PRESENT STATUS OF FERROMAGNETIC THEORY 75 lines determined by the crystal axes, indicating that stray magneticfields go in and out of the surface just as if some sections were mag-netized differently from their neighbors. This occurs even when theiron is unmagnetized, but never occurs with materials that are notferromagnetic. Now consider in more detail by what processes changes in magneti-zation occur. Most changes are attr
. The Bell System technical journal . (a) (b) (c) Fig. 9—Powder-patterns for iron (McKeehan and Ellmore): (left) field outward;(middle) demagnetized; (right) field inward. PRESENT STATUS OF FERROMAGNETIC THEORY 75 lines determined by the crystal axes, indicating that stray magneticfields go in and out of the surface just as if some sections were mag-netized differently from their neighbors. This occurs even when theiron is unmagnetized, but never occurs with materials that are notferromagnetic. Now consider in more detail by what processes changes in magneti-zation occur. Most changes are attributable to the reorientation ofelectron spins in domains, from one direction of easy magnetizationto another (Fig. 10). These are the changes that take place over the.
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