Gadolinium 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-1400GA	1400	<40	1.98	15.6	0.00015	270	2.9
CG-1200GA	1200	<40	1.99	15.4	0.00015	255	3.5
CG-1000GA	1000	<45	2.0	15.2	0.00015	235	4.1
CG-800GA	800	<45	2.0	15.0	0.00015	220	5.1
CG-700GA	700	<45	2.01	14.8	0.00015	210	5.3
CG-550GA	550	<50	2.02	14.6	0.00015	185	5.6

* measured at 9.0 GHz

Composition:

[Y_3-xGd_x] [Fe₂] [Fe_3-yAl_y] O₁₂

Types CG-1400GA through CG-550GA are yttrium-gadolinium-aluminum-iron garnets in order of increased gadolinium substitution.

Characteristics & Applications

These garnet materials have properties found in both gadolinium substituted and aluminum substituted garnets. The aluminum substitution provides a wide range of saturation magnetization. The gadolinium substitution increases the microwave power handling ability and improves the temperature stability. Improved broadband circulator characteristics that specify minimum insertion loss are attainable because of the low dielectric loss tangent of these materials. The frequency range of these materials is from L-band through C-band for non-resonant devices.