In materials, all molecules in microscopic regions {domain, magnetism}| can have same magnetic-field alignment.
magnetization
After removing magnetization, domains return to original orientations {magnetic memory, domain}.
anistropy
Crystals magnetize differently on different axes {magnetocrystalline energy} {magnetocrystalline anisotropy}.
energy
Unaligned domains minimize magnetic-field potential energy {magnetostatic energy}. Boundaries between domains add potential energy {domain wall energy}. Domain-wall width increases by exchange energy but decreases by magnetocrystalline energy.
length
Crystals change length when magnetized, because domains shift {magnetostrictive energy}. Iron gets longer. Nickel gets shorter.
Physical Sciences>Physics>Electromagnetism>Magnetism>Permeability
5-Physics-Electromagnetism-Magnetism-Permeability
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224