Polycrystalline YIG has much broader ferromagnetic linewidth than polycrystalline Calcium Vanadium doped YIG with Ms=1850 Gs. This is related to differences in anisotropy constants for the the two materials. They are well for monocrystalline YIG. Does anybody know anisotropy constants for
monocrystalline Calcium Vanadium doped YIG?
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
With best regards
Jerzy
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