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Magnetic and Electronic Properties of Rapidly Quenched Materials

  • R. C. O’Handley
  • H. H. Liebermann
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 29)

Abstract

Magnetic materials derive their usefulness from the fact that the magnetization, Ms = Nμm/V i. e. the volume density of atomic magnetic moments, μm, can be changed by application of a magnetic field. As temperature increases it becomes increasingly more difficult for an applied field to orient the atomic moments. The net spontaneous magnetization, vanishes at the Curie temperature, T c (Fig. 6.1). Above T c, atomic magnetic moments may still exist but their long-range orientations are no longer correlated. Of course with a strong enough field, one could overcome the effects of k B T and fully align these paramagnetic moments, but at room temperature such fields do not exist. Below T c, the ability to change the orientation of the saturation magnetization by application of a magnetic field is limited by the magnetic anisotropy (the preference for M to lie in a particular direction dictated by crystallography, shape and strain). The M(H) curves shown indicate nothing about magnetic anisotropy as they stand; magnetic anisotropy implies a difference in the field needed to magnetize a sample in different directions. If significant anisotropy were present, saturation in a hard direction would require a larger field than saturation in an easy direction. Magnetostriction is the strain (typically measured in parts per million) that accompanies a change in magnetization. The inverse effect, piezomagnetism, a change in the direction of preferred magnetization induced by a stress, is also very important.

Keywords

Domain Wall Metallic Glass Amorphous Alloy Magnetic Anisotropy Magnetocrystalline Anisotropy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • R. C. O’Handley
  • H. H. Liebermann

There are no affiliations available

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