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Ferromagnetism (ferromagnetic material usage (magnetic storage in the form…
Ferromagnetism
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Classical Explanation
Weiss theory, depicts how the Weiss molecular field is proportional to the magnetization of the ferromagnetic material
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this equation show the total magnetic field with H as the exterior field
due to similarity with paramagnetism the equation below can be solved and exchanged for H in Langevin function
due to beta M = 0 above Curie temperature(no internal field exist) resulting the Curie-Weiss law
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Temperature Dependence
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reached Curie temperature cause randomly aligned moments and spin-soupling limit has been surpassed before break down making it act paramagnetically
this figure shows how the moments are aligned below Curie Temperature and above it.
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the spins of electrons are all pointing in the same direction causes strong attraction or repulsion unlike paramagnetism all electrons are pointing in all different direction