Modeling Material with Scalar Permeability

[badenny]

I am attempting to model a periodic permanent magnet with Radia. I can tell the code is incredibly powerful for magnetstatic simulations but has a learning curve.

Suppose I wanted to model an iron material with a scalar permeability $\mu_r = \chi +1 = 4000$ so that the flux density and field are related by $\overrightarrow{B} = \mu_0 \mu_r \overrightarrow{H}.$ I understand there is an example of using a different model for iron in Example 6, but I am trying to replicate a result from a FEM code that uses this scalar model.

The material commands in the reference manual are here

I thought, perhaps, using rad.MatLin([mu_r,mu_r], .35]) could work but this requires an axis of easy magnetization i.e. specifying that the material is a permanent magnet, which is not what I want to model.

What is the appropriate what to specify a scalar permeability?