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← ScienceWhich defect encourages domain wall pinning in ferromagnetic materials?
A)Increased grain boundary dislocations✓
B)Reduced applied magnetic field
C)Elevated operating temperature
D)Simplified crystal lattice structure
💡 Explanation
Grain boundaries cause domain wall pinning because the domain wall moves to minimize energy through magnetostatic energy minimization; therefore, domain walls get 'stuck' where the crystal structure is discontinuous, rather than at easier locations.
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