Abstract
The partial substitution of Fe3+ by diamagnetic Me3+ in BaMexFe12-xO19 with Me = Ga and Y (0 ≤ x ≤ 2) was studied. Samples were synthesized by the mixed-oxide route and their properties were compared to BaScxFe12-xO19 ferrites. It was shown by XRD that the hexagonal lattice parameters with x for Me = Ga and Sc vary continuously. For Me = Y no single-phase ferrites were obtained indicating that the solubility limit for Y in Ba ferrite is very limited. For Me = Ga and Sc, the saturation magnetization at room temperature is reduced with x. The coercivity as well as the ferromagnetic resonance frequency remain almost unchanged for Ga-substituted ferrites, whereas for Sc-substituted ferrites the coercivity and ferromagnetic resonance frequency decrease with x. Thick films of Sc-ferrite (x = 0.5) were screen-printed onto LTCC tape substrates and post-fired at 900°C. Application of a magnetic field during drying allows fabrication of textured ferrite layers. Alternatively, ferrite tapes and LTCC tapes were successfully co-fired at 900°C.
Highlights
Future satellite communication technologies require microwave ferrites capable of being integrated in low-temperature ceramic cofiring (LTCC) multilayer modules for operation at high frequency, e.g. within the Ka-band (2640 GHz)
We report for the first time on cofiring and post-firing of ferrite layers with low-dielectric LTCC tapes at 900○C
This demonstrates the potential of oriented hexagonal ferrite layers as embedded magnetic components in LTCC microwave modules operating at K-band frequencies
Summary
Future satellite communication technologies require microwave ferrites capable of being integrated in LTCC multilayer modules for operation at high frequency, e.g. within the Ka-band (2640 GHz). On the other hand, exhibit ferromagnetic resonances (FMR) at microwave and millimeter wave bands. They provide sufficient remanent magnetization and anisotropy to allow self-biasing. Substituted M-type hexagonal ferrites with their FMR in the desired frequency band and self-biasing ability exhibit significant potential for miniaturization of such microwave devices. We report for the first time on cofiring and post-firing of ferrite layers with low-dielectric LTCC tapes at 900○C This demonstrates the potential of oriented hexagonal ferrite layers as embedded magnetic components in LTCC microwave modules operating at K-band frequencies
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