Magnetic permeability of Fe3O4

[sachindra]

Can someone please point me any article or link that gives magnetic permeability of Fe3O4? I have searched for quite sometime now and cannot find the answer.

Because of magnetic property of Fe3O4 powder and how commonly it is used, I assumed it has high magnetic permeability. From all the information (magnetic susceptibility, molecular weight, and density) all I could back calculate was it has relative magnetic permeability of around 3? Although I didn't expect it to be as high as pure iron (which has relative magnetic permeability of 5000), I expected something significant.

Can anyone point me to right document to refer? I don't know where to ask this.

[Skippy]

The typical permeability figures quoted for magnetite are 3 to 6 ( SI metric ) , but it can vary from 1 to 20, it depends on the 'variety' of magnetite.
On the popular Teknetics T2 / Fisher F75 machines, they have a ground-signal strength meter, that is calibrated in "percentage magnetite", and the user manual has a conversion from "percentage magnetite" to metric units. The figure they use for the conversion is magnetite permeability = 3.14 ( SI metric ).

I personally think this variability is one reason to calibrate the ground-strength meter in SI-metric units, and put the '% magnetite' conversion in the user manual.

This web page covers magnetite properties quite well:
https://www.eoas.ubc.ca/courses/eosc...magsuscept.htm

[Skippy]

You're welcome.

And here is some additional chat on the subject, on a US forum:
https://www.detectorprospector.com/f...ge/4/#comments

[sachindra]

The typical permeability figures quoted for magnetite are 3 to 6 ( SI metric ) , but it can vary from 1 to 20, it depends on the 'variety' of magnetite.
On the popular Teknetics T2 / Fisher F75 machines, they have a ground-signal strength meter, that is calibrated in "percentage magnetite", and the user manual has a conversion from "percentage magnetite" to metric units. The figure they use for the conversion is magnetite permeability = 3.14 ( SI metric ).

I personally think this variability is one reason to calibrate the ground-strength meter in SI-metric units, and put the '% magnetite' conversion in the user manual.

This web page covers magnetite properties quite well:
https://www.eoas.ubc.ca/courses/eosc...magsuscept.htm

You're welcome.

And here is some additional chat on the subject, on a US forum:
https://www.detectorprospector.com/f...ge/4/#comments

Thank you very much. I appreciate it.