Garnets, Ferrite spinel and Hexaferrites

Transcription

1 Microwave Ferrites Part 8 Garnets, Ferrite spinel and Hexaferrites FERRITE DOMEN Co. Since 1959 The company performing R&D and production of all kind of microwave garnets, spinels, hexaferrites, and absorbing ferrites used in various components of broad spectrum of radio engineering facilities such as radar antennas, telecommunication complexes including mobile satellite stations, electronic countermeasure systems, high power devices of particle accelerators, different contactless measuring/sensor instruments, the list can go on-and-on. CONTENTS Microwave Garnets Page Symbols Yttrium Garnets YIG - Al doped Narrow Line Width Garnets 3.1. YIG - Ca doped YIG Ca, V doped YIG Gd, Al doped YIG - Gd, In doped YIG - Gd, rare earth elements doped 8-5 Microwave Spinel 7. Nickel ferrite spinels Lithium ferrite spinels Lithium ferrite spinels with excellent square loop properties Manganese ferrite spinels 8-7 Hot-pressed Microwave Garnet & Spinel 11. YIG, hot-pressed - for high peak power devices Nickel ferrite spinels, hot-pressed Microwave Hexaferrite 13. Hexaferrites High density hexaferrites 8-9 Standard form factors of microwave material parts 8-10 FERRITE DOMEN Co. 25, Tsvetochnaya st., Bld St. Petersburg, Russia Fax +7 (812) info@domen.ru

2 8-2 Symbols SYMBOLS 4πM s Saturation magnetization Gauss ΔH FMR linewidth (3 db) Oe ε Dielectric constant tgδ ε Dielectric loss tangent g eff Landé factor Tc Curie temperature o C ΔH k Spin wave linewidth Oe Hc Coercive force Oe H Aeff Effective anizotropy field Oe Br Remanent flux density Gauss ρ Balk density g/cm 3 TKε Temperature coefficient of dielectric constant ppm/ o C Note. ΔH, ΔHk, ε, tgδ ε 9.4 GHz

3 Microwave Garnets Yttrium Garnets Pure Yttrium garnets are the basic ferromagnetic materials for the whole series of YIG - doped compositions, see example grade. 4πM s ΔH (-3dB) ε tgδ. ε 104 g eff Tc ΔH k +5% no more +5% no more +3% nominal nominal NG NG YIG - Al doped That series of microwave garnets is presented as the richest product mix by saturation magnetization values. They are most widely used in low power m-, dm-, and cm-wave devices. 4πM s ΔH (-3dB) ε tgδ. ε 104 Tc ΔH k no more +5% no more nominal nominal GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±5% GA ±25 G GA ±25 G GA ±25 G Note. Landé factor, g eff is 2.00 for all materials of this group.

4 8-4 Microwave Garnets 3. Narrow Line Width Garnets The garnets of this group feature the narrowest FMR linewidth of all YIG series. They are especially suitable for application in microwave devices (including cryogenic ones) having low losses and efficient in wide frequency and temperature ranges. Material grade 3.1. YIG - Ca doped 4πM s ΔH (-3dB) ε tgδ. ε 104 Tc g eff ΔH k +5% no more +5% no more nominal +3% nominal NG NG NG NG NG NG NG NG NG YIG - Ca, V doped 4πM s ΔH (-3dB) ε tgδ. ε 104 Tc g eff ΔH k +5% no more +5% no more nominal +3% nominal NGV NGV NGV NGV NGV NGV

5 Microwave Garnets YIG - Gd, Al doped The prime features of these garnets are high temperature stability of their parameters, good squareness of hysteresis loop and raised threshold power. They find wide application in average and high power non-reciprocal as well as controlled microwave devices (phase shifters, switches, filter etc.). Material grade 4πMs ΔH (-3dB) ε tgδ. ε 104 Tc Hc Br ΔH k g eff G Oe +5% no more +5% no more nominal nominal nominal nominal +3% GG GG GG GG GG GG GG YIG - Gd, In doped The garnets of this group have low losses with rather high thermal stability of saturation magnetization and good threshold characteristics. They were developed for use in non-reciprocal average power devices. Material grade 4πM s ΔH (-3dB) ε tgδ. ε 104 g eff Tc ΔH k no more +5% no more +3% nominal nominal GI ±5% GI ±5% GI ±5% GI ±5% GI ±5% GI ±5% GI ±5% GI ±30 G GI ±25 G GI ±25 G YIG - Gd - Al, rare earth elements doped The garnets of this group feature extremely good threshold characteristics. They are used in devices that must operate at high peak power levels. 4πM s ΔH (-3dB) ε tgδ. ε 104 Tc ΔH k g eff no more +5% no more nominal no more +3% GH ±5% GH ±5% GH ±5% GH ±25 G

6 8-6 Microwave Spinel 7. Nickel ferrite spinels The spinels of this group feature high Curie temperature. They are widely used in resonance devices operating at cm- and mm- wave ranges. 4πM s ΔH (-3dB) ε tgδ. ε 104 g eff Tc Hc Br G +5% no more +5% no more +3% nominal nominal nominal SN SN SN SN SN < 0.4 > 2800 SN SN SN SN SN SN Lithium ferrite spinels Spinels of this group feature low non-resonant magnetic losses, high remanent flux density, and high Curie temperature. They are mostly used in non-resonant controlled devices of low power levels at cm- and mm- wave ranges (phase shifters, switches etc.). 4πM s ΔH (-3dB) ε tgδ. ε 104 g eff Tc Hc Br G +5% no more +5% no more +3% nominal nominal nominal SL SL < 0.6 > 3000 SL SL < 0.4 > 2800 SL SL SL SL SL SL SL SL < 1.4 > 1200 SL

7 MicrowaveSpinel Lithium ferrite spinels with excellent square loop properties 4πM s ΔH (-3dB) ε tgδ. ε 104 g eff Tc Hc Br G +5% no more +5% no more +3% nominal nominal nominal SL > 3000 SL > 3000 SL > Manganese ferrite spinels These materials are applied where it is necessary to have low magnetic and dielectric losses. 4πM s ΔH (-3dB) ε tgδ. ε 104 g eff Tc Hc Br G +5% no more +5% no more +3% nominal nominal nominal SM SM SM SM SM SM SM SM SM

8 8-8 Hot-pressed Microwave Garnet & Spinel 11. YIG, hot-pressed - for high peak power devices The garnets of this group feature extremely good threshold characteristics. They are used in devices that must operate at high peak power levels. 4πM s ΔH (-3dB) ε tgδ. ε 104 Tc ΔH k g eff no more +5% no more nominal no more +3% GH ±5% GH ±5% GH ±5% GH ±5% GH ±25 G Nickel ferrite spinels, hot-pressed The hot-pressed Nickel spinels are characterized by very low porosity and high thermal conductivity of ferrite article body. They are recommended for use in microstrip microwave devices as well as high power waveguide ones. 4πM s ΔH (-3dB) ε tgδ. ε 104 g eff Tc Hc Br ΔH k G Oe +5% no more +5% no more +3% nominal nominal nominal nominal SH-520 < , > 6 SH < SH SH SH > 9 SH SH SH SH

9 Microwave Hexaferrite 8-9 Hexaferrites occupy a special place among the microwave magnetic materials. They feature high magnetic anisotropy (17 koe) and are recommended for the use in millimeter wave isolators and circulators workable at frequencies 10 GHz through 100 GHz. Hexaferrites permit to create miniaturized yet discrete microwave devices that do not require a permanent biasing magnets in the component package. High-density hexaferrites are ideal for MIC application and microstrip mm-wave devices. 13. Hexaferrites Material grade Haeff 4πM s ΔH (-3dB) ε tgδ ε. 104 Tc Hc ρ koe G koe oc koe g/cm3 +5% +5% no more +5% no more nominal nominal H H H H H H H H H H H H High density hexaferrites Material grade Haeff 4πM s ΔH (-3dB) ε tgδ ε. 104 Tc Hc ρ koe G koe oc koe g/cm3 +5% +5% no more +5% no more nominal nominal HD HD HD HD HD HD HD HD HD HD HD

10 8-10 Standard form factors of microwave material parts h Disks and Rings h D d D Plates and triangles B h H L h Rods and bars L L D B Dimensions of garnets, ferrite spinels, mm Disks Plates and Rods and triangles bars Rings D L B H 90 h d 2 70 Dimensions of hexaferrites and hot-pressed ferrites, mm Disks Plates D L 40 B 35 h Standard surface finish of parts: ± 0,02 mm Standard surface roughness: Ra 0,6 mm Fabrication of customized parts is being provided.