Example 7.4 Calculation of wall energy and thickness from anisotropy energy, saturation magnetization and exchange energy. Find the domain-wall energy y, wall thickness / and critical dimension r, for single-domain particles for a material with anisotropy energy K= 33 x 104 J m-3, saturation magnetization M, = 0.38 x 10° A/m, lattice spacing 3 x 10-10 m and exchange energy J = 3 x 10-21 J. You may assume this material has a spin of S = 1/2, or magnetic moment per atom of one Bohr magneton.
Example 7.4 Calculation of wall energy and thickness from anisotropy energy, saturation magnetization and exchange energy. Find the domain-wall energy y, wall thickness / and critical dimension r, for single-domain particles for a material with anisotropy energy K= 33 x 104 J m-3, saturation magnetization M, = 0.38 x 10° A/m, lattice spacing 3 x 10-10 m and exchange energy J = 3 x 10-21 J. You may assume this material has a spin of S = 1/2, or magnetic moment per atom of one Bohr magneton.
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Transcribed Image Text:Example 7.4 Calculation of wall energy and thickness from anisotropy energy,
saturation magnetization and exchange energy. Find the domain-wall energy y, wall
thickness I and critical dimension r, for single-domain particles for a material with
anisotropy energy K=33 × 10* J m¯', saturation magnetization M,= 0.38
x 10° A/m, lattice spacing 3 × 10~1º m and exchange energy J = 3 × 10-21 J. You
may assume this material has a spin of S = 1/2, or magnetic moment per atom of
one Bohr magneton.
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