Hi,

There are some magnetic anisotropy parameters of Fe films in different papers (e.g. Article Properties of Fe single‐crystal films grown on (100)GaAs by ...

For example, from this paper K1_=0.25 kOe for 20nm Fe film (noted that K1_=K1/M). Also, 4piM=17.1 kG.

So, the question is how to convert this parameters to SI J/m^3 units?

I've tried to do that, but probably failed. The main problem is to get right CGS units of K that are erg/cm^3 from which you can easily get right SI units of K that are J/m^3 (just multiplying by 10^-1).

If you just multiply K_ by M without 4pi (M that has erg/(G*cm^3) units) you will not get CGS units of K that are erg/cm^3 (if I understand correctly). So, in this case the desired values will be close to the standard values for this class of materials: K1=(0.25*10^3*17.1*10^3)/(4pi*10)=3.4*10^4 (J/m^3?).

Also, if you just multiply K_ by M with 4pi (4piM that has G/cm^3 units, I'm not sure) looks like you'll exactly get right CGS units of K (erg/cm^3), but this looks in conflict with the definition of K_=K/M from the above paper and also in this case obtained value looks an order of magnitude more than standard values for this materials K1=(0.25*10^3*17.1*10^3)/(10)=42.75*10^4 (J/m^3?).

So, what's the problem with my reasoning ?