This document discusses magnetic materials and their properties. It covers magnetic anisotropy, which refers to the directional dependence of a material's magnetic properties and can occur intrinsically in single crystal materials or be induced in polycrystalline materials through treatments like cold working or magnetic annealing. The document also discusses magnetostriction, the phenomenon where ferromagnetic materials change shape or dimensions due to being subjected to a magnetic field. There are different types of magnetostriction including longitudinal, transverse, and volume magnetostriction. Joule magnetostriction is also mentioned.

1. ELECTRICAL ENGINEERING
MATERIALS: MAGNETIC MATERIALS
MR. ASIF L. JAMADAR

2. MAGNETIC ANISOTROPY
 Single crystal magnetic materials (e.g.
Iron)
 Magnetocrystalline Anisotropy
 Polycrystalline materials
 Material which subjected to specific
treatment (Induced Anisotropy)
 Example of induced anisotropy (Ni-Fe
alloy)
 Methods of uniaxial anisotropy,
 Cold working
 Magnetic annealing
2

3. MAGNETOSTRICTION
 Phenomenon of Magnetostriction
 Types of Magnetostriction
 Longitudinal Magnetostriction
 Transverse Magnetostriction
 Volume Magnetostriction
 Joule Magnetostriction
 λ is generally not greater than 30 X 10-6
 Villari effect is observed
 Largely theoretical interest and limited
3

4. THANK
YOU
4