# Magnetisation of ferromagnet

paweld
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 completly different then the one
which change the state of the system.)