Oxide thin ®lms have been studied for frequency and phase agile electronics. The electric-®eld tuning of microwave devices employs ferroelectrics, while the Magnetic-®eld tuning uses ferrites. The critical material parameters for ferroelectric thin ®lms are the tunability of the dielectric constant and the dielectric loss. This paper describes the current understanding of the fundamental mechan...

Ferrites and lossy ceramics, used in HOM (higher order mode) loads for superconducting accelerators, have shortcomings such as poor batch-to-batch reproducibility of electromagnetic properties, extremely low electric conductivity at cryogenic temperatures leading to accumulation of charge on the material surface, brittleness, which may cause contamination of the nearby SRF cavities by lossy dus...

Magnetic properties of single crystals of cobalt and substituted cadmium-cobalt spinel ferrites are presented under high magnetic field up to 180 kOe in the 4.2-300 K temperature range for five substitution rates. The easy direction of magnetization is [loo] whereas abrupt field transitions are observed below 150 K for the [Ill] direction. The influence of the cadmium substitution on the molecu...

The state of the art of microwave ferrite technology in Russia is reviewed. The paper gives some generalization with respect to the future progress in the field, where the one of major tasks is likely to be a development of specialized gyromagnetics for mmand sub-mm-range devices. The present state of the art and trends in developmenl. of microwave ferrites in Russia are shown via analysis of c...

The dipolar energy contribution to the anisotropy of M, Wand Y-type hexagonal fenites is examined. The geometrical coeff~cients kij are given, so that a calculation for any hexaferrite with the same structure can be effected. Differences in the results of previous works are explained as due to a simplifying assumption, the validity of which is restricted. The ambiguity regarding dipolar energy ...

Crystalline and nanostructured cobalt (CoFe2O4), nickel (NiFe2O4), zinc (ZnFe2O4) and manganese (MnFe2O4) spinel ferrites are synthesized with high yields, crystallinity and purity through an easy, quick, reproducible and low‐temperature hydrothermal assisted route starting from an aqueous suspension of coprecipitated metal oxalates. The use of water as a reaction medium is a further adva...

Mn-Zn ferrites substituted with Ti4+ ions are now becoming commercially important. The substitution with titanium ions in Mn-Zn ferrite is recommended for ferrites with low losses and low temperature factor of initial permeability, Tdpi because of the shift of the secondary maximum of permeability, SMP, towards lower temperatures [I] and the increase of he d.c.resistivity [3,4,5]. The present p...

Advances in wireless communication place an increasing number of demands on antenna performance, necessitating the presence various capabilities a single device. Reconfigurable antennas are frequently utilized to meet these application within restricted area. The purpose this book chapter is summarize general introduction about hard ferrites, different synthesis methods ferrite for and altering...