Dear Professor, first, as I understand, the value of 1850 Gs rather refers to the magnetization of unsubstituted garnet in terms of 4πMs.

Secondly, if You will find it interesting and useful, I can report information about iron garnet with {Bi3–2xCa2x}[Fe2](Fe3–xVx)O12 composition: anisotropy field of Hk = |K1|/Ms is equal to 240, 80, 40 and 16 Oe at x = 1.1, 1.2, 1.3 and 1.5 respectively, and the value of 4πMs changes almost linearly from 0 at x = 1 to 760 Gs at x = 1.5.

All the best,

Alexander

 Dear Professor, Thank you for your answer.

I refer to SKYWORKS Calcium Vanadium doped YIG having Ms=1850 Gs.

I've measured the ferromagnetic linewith of several narrow linewidth series 

from this manufacturer and I've found that the linewith of  polycrystalline spherical sample made of  TTVG1850 material had the linewidth of 3.7 Oe which is about 4 times 

smaller than for pure  polycrystalline YIG with Ms=1800 Gs.

The only explanation of such phenomenon is much smaller anisotropy constant

for TTVG1850 than for YIG.

If you are intereseted in futher discussion about this phenomena please send me e-mail

to [email protected]

With best regards

Jerzy