Pure and Aluminum Substituted Garnet

Material Type	Saturation Magnetization (4p Ms) gauss	Line Width (DH) oersteds @ -3dB *	g-effective*	Dielectric Constant (e')	Dielectric Loss Tangent *	Curie Temp (ºC)	Spin Wave Line Width DH_K (oe)*
CG-1800	1800	<30	1.98	15.8	0.00015	280	1.5
CG-1801	1800	<20	1.98	15.8	0.00015	280	1.4
CG-1600A	1600	<25	1.98	15.7	0.00015	265	1.5
CG-1400A	1400	<25	1.98	15.5	0.00015	250	1.5
CG-1200A	1200	<25	1.99	15.3	0.00015	230	1.4
CG-1000A	1000	<25	2.0	15.1	0.00015	215	1.4
CG-800A	800	<25	2.0	14.9	0.00015	200	1.4
CG-700A	700	<20	2.01	14.7	0.00015	190	1.4
CG-550A	550	<20	2.01	14.5	0.00015	165	1.3
CG-400A	400	<20	2.02	14.3	0.00015	140	1.3
CG-350A	350	<20	2.02	14.2	0.00015	130	1.3
CG-300A	300	<20	2.02	14.1	0.00015	125	1.3
CG-250A	250	<20	2.03	14.1	0.00015	115	1.3
CG-175A	175	<20	2.04	14.1	0.00015	95	1.3

* measured at 9.0 GHz

Composition:

[Y₃] [Fe₂] [Fe_3-x Al_x] O₁₂

Type CG-1800 is a pure yttrium-iron garnet. Types CG-1600A through CG-175A are yttrium-aluminum-iron garnets in order of increased aluminum substitution. These materials are free of gadolinium and other rare earth substitutes.

Characteristics & Applications

These garnet materials offer a narrow line width and very low dielectric loss tangent. The exclusion of rare earth substitutes results in the narrow line width of these garnet materials and also allows operation to low temperatures near absolute zero. Improved broadband circular characteristics that specify minimum insertion loss are attainable. The frequency range of these materials is from P-band to X-band for non-resonant devices.