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It concerns Gadolinium metal. I was trying but failed to measure the magnetic field of gadolinium metal as a function of temperature from 77K to it's curie temperature of 293K. However as I am doing my write up I am trying to produce some theoretical values for the expected magnetic field from the metal.

The susceptibility of Gadolinium at 0K is given as 755,000 in the CRC handbook. And I found a journal which quoted the saturation magnetisation to be 253.6cgs units. How do i turn this into a value for B?

I know when you apply a magnetic field to a ferromagnet it's magnetisation increased until saturation is reached. Then if you remove this applied field the ferromagnet retains a remanent magnetisation. How is this magnetisation M related to B?

I know that B=u(H+M) and in the absense of an applied field then B=uM then surely putting in the numbers with u=755000Uo and M=253.6 then you would get a field of just

240gauss. Surely the expected result would be much bigger. What have i done wrong?

Please could someone help i am almost literally tearing my hair out.

Thanks in advance