Suppose you have a sphere of single-crystal cobalt with diameter L. For what values of L would you expec chis to be a single domain particle? Assume the magnetostatic energy of a uniformly magnetized sphere of volume V = 4/37(L/2)° is given by HoM? V. %3D For Co, M, = 1400KA/m, K 4 × 105 J/m³, a 0.25nm and A = 10¬18 J. Particles remain single domain when L is less than what value? Hint: Remember that the expression provided in class and in the notes for domain wall energy Ew is given J/m².
Suppose you have a sphere of single-crystal cobalt with diameter L. For what values of L would you expec chis to be a single domain particle? Assume the magnetostatic energy of a uniformly magnetized sphere of volume V = 4/37(L/2)° is given by HoM? V. %3D For Co, M, = 1400KA/m, K 4 × 105 J/m³, a 0.25nm and A = 10¬18 J. Particles remain single domain when L is less than what value? Hint: Remember that the expression provided in class and in the notes for domain wall energy Ew is given J/m².
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Transcribed Image Text:Suppose you have a sphere of single-crystal cobalt with diameter L. For what values of L would you expect
this to be a single domain particle? Assume the magnetostatic energy of a uniformly magnetized sphere of
volume V
- 4/3T(L/2)° is given by µo M? V.
For Co, Ms
1400KA/m, К 3 4х 10° J/m3, а —
0.25nm and A = 10-18 J.
Particles remain single domain when L is less than what value?
Hint: Remember that the expression provided in class and in the notes for domain wall energy Ew is given in
J/m2.
L (in nm):
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