Ferrimagnetic materials

Technical Magnetic Behavior. When a magnetic-field strength H is appHed to a ferromagnetic or ferrimagnetic material, the latter develops a flux density or iaduction as a result of orientation of the magnetic domains. The relation between B and H is... 

Laboratory, particularly to study ferrimagnetic materials. In 1994, a Nobel Prize in physics was (belatedly) awarded for this work, which is mentioned again in the next chapter, in Section 7.3. A range of achievements in neutron crystallography are reviewed by Willis (1998). 

Figure 6.52 The magnetic spin alignments and variation of snsceptibUity with temperatnre for (a) ferromagnetic, (b) antiferromagnetic, and (c) ferrimagnetic materials. From K. M. Ralls, T. H. Courtney, and J. Wulff, Introduction to Materials Science and Engineering. Copyright 1976 by John Wiley Sons, Inc. This material is used by permission John Wiley Sons, Inc.

Explain why many ferrimagnetic materials crystallize in a spinel lattice. 

Figure 2. Neel s classification of magnetization curves for ferrimagnetic materials.

The Lang method can also reveal magnetic domains in ferromagnetic and ferrimagnetic materials [8.21]. Here, spontaneous magnetostrictive strains in domains and domain walls are enough to upset the regularity of the lattice and constitute crystal imperfections. 

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