Ordering and Magnetic Anisotropy

Plastic deformation of metals and alloys occurs by slip and/or twinning on certain crystallographic planes and along certain crystallographic directions and is accomplished by the movement of dislocations (Volume 2, Chapter 7). Plastic deformation results in considerable disorder, leading to phase transformations in some cases. The de- 

Deformation-Induced Magnetic Anisotropy. Ni3Fe Alloys (LI 2 Structure) 

Directional order theory yields an expression for the induced macroscopic anisotropy energy E which results when there is an asymmetric distribution of atom pairs (or or 

Like-atom pairs, denoted by double bars, are produced along the [Oil] direction perpendicular to the [OTl] slip direction, while the pair distribution is unchanged in the other five 110 directions. For the SRO case, the direction of BB pairs induced by (lll)[0Tl] slip are no longer along [011], but equally probable in the three 110 directions connecting the (111) slip planes, i.e., [011], [101], and [110]. 

From a knowledge of the initial orientation of a crystal or the texture of a polycrystalline material, the nature of the deformation processing, active slip systems, and degree of order, the slip-induced easy axis of magnetization can be determined from the above equa-tions. 6.68. i) 

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