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# magnetic persistence and permeability

## magnetic persistence and permeability

(OP)
who knows the general value of magnetic persistence and permeablity of N45H magnet? Thank you.
Replies continue below

### RE: magnetic persistence and permeability

Are you looking for the permeance?  There is no general value for permeability for N45H or any NdFeB magnet.

The permeance for all grades of NdFeB is 1.05.

Can you please clarify what you mean by "magnetic persisitence"?

### RE: magnetic persistence and permeability

(OP)
Dear MagMike, thank you for your help. Can you tell me what is the value of remanence relative permeability of N45H? The unity of the value is "T/A/m" (Tesla/Ampere/meter), is this a general value or not? And how to calculate this?

### RE: magnetic persistence and permeability

It is not usually specified in units of Tesla/Ampere/meter (or, more properly: Tesla-meter/Ampere).

At remanence for most NdFeB materials, the relative permeability is close to 1.05 multiplied by permeability of free space.  The permeability of free space has two values, depending on if you are using SI units (Tesla, ampere/meter) or CGS (Gauss, Oersted)

In SI units, permeability of free space is 12.57*10E-7
In CGS units, permeability of free space is 1

I'm not sure what you mean by "how to calcuate this".  Can you please describe your application?

### RE: magnetic persistence and permeability

(OP)
Thank you very much, MagMike! This information is what we want to know. I really appreciate your time and help.

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