Is the Magnetisation of Ferromagnetic Materials Thermodynamically Reversible?

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SUMMARY

The magnetisation of ferromagnetic materials is not thermodynamically reversible. According to the definition of reversibility, a process is reversible if the system and environment can return to their initial states without any net change. Heating ferromagnetic materials to their Curie temperature results in a loss of magnetisation, and upon cooling, the material does not return to its original magnetic state. This indicates that the magnetisation process involves irreversible thermodynamic changes.

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paweld
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I wonder if the process of magnetisation of ferromagnetic material is reversible in
a thermodynamic sense according to the following definition of reversibility?

Reversible process - let's assume that initial state of the system
was a, initial state of the environment was b and final state of the system and
environment was a' and b' appropriately. If there exists a process which
changes the state of full system (considered system + environment)
form (a',b') to (a,b) the process is said to be reversible.
(This definition allows the reverse process to completely different then the one
which change the state of the system.)

What are your opinions about it?
 
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If you heat it up hot enough you will reach the curie temp.
 

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