The present invention relates to a ferrite sintered plate having a composition comprising 47 to 50 mol % of Fe.sub.2O.sub.3, 7 to 26 mol % of NiO, 13 to 36 mol % of ZnO, 7 to 12 mol % of CuO and 0 to 1.5 mol % of CoO, as calculated in terms of the respective oxides, in which the ferrite sintered plate has a volume resistivity of 110.sup.8 to 110.sup.12.Math.cm and a thickness of 10 to 60 m; and a ferrite sintered sheet comprising the ferrite sintered plate on a surface of which a groove or grooves are formed, and an adhesive layer and/or a protective layer formed on the ferrite sintered plate, in which the ferrite sintered sheet has a magnetic permeability at 500 kHz a real part of which is 120 to 800 and an imaginary part of which is 0 to 30, and a product (m) of the real part of the magnetic permeability at 500 kHz of the ferrite sintered sheet and a thickness of the ferrite sintered plate is 5000 to 48000. The ferrite sintered plate and the ferrite sintered sheet according to the present invention have a high volume resistivity as well as a large value and a small value of a magnetic permeability thereof, and therefore can be suitably used as a shielding plate in a digitizer system.

A ceramic composite material includes Barium titanate (BaTiO.sub.3) and CoFe.sub.1.98Nb.sub.0.02O.sub.4. The BaTiO.sub.3 is present in an amount of 1 to 99 percent by weight based on the total weight of the BaTiO.sub.3 and the CoFe.sub.1.98Nb.sub.0.02O.sub.4. The CoFe.sub.1.98Nb.sub.0.02O.sub.4 is present in an amount of 1 to 99 percent by weight based on the total weight of the BaTiO.sub.3 and the CoFe.sub.1.98Nb.sub.0.02O.sub.4. These composite products may be suitable for high-frequency electromagnetic device applications.

In an aspect, an M-type ferrite comprises an element Me comprising at least one of Ba, Sr, or Pb; an element Me comprising at least one of Ti, Zr, Ru, or Ir; and an element Me comprising at least one of In or Sc. In another aspect, a method of making the M-type ferrite can comprise milling ferrite precursor compounds comprising oxides of at least Co, Fe, Me, Me, and Me to form an oxide mixture; wherein Me comprises at least one of Ba, Sr, or Pb; Me is at least one of Ti, Zr, Ru, or Ir; and Me is at least one of In or Sc; and calcining the oxide mixture in an oxygen or air atmosphere to form the ferrite.

Provided in the present application are a nickel-zinc ferrite material, and a preparation method therefor and the use thereof. The nickel-zinc ferrite material comprises a main material, a functional additive and a correcting agent, wherein the main material comprises Fe.sub.2O.sub.3, Ni.sub.2O.sub.3, ZnO and CuO; the functional additive comprises a combination of any three or at least four of Mn.sub.3O.sub.4, TiO.sub.2, Ta.sub.2O.sub.5, Co.sub.2O.sub.3 or Sm.sub.2O.sub.3; and the correcting agent comprises Fe.sub.2O.sub.3 and Ni.sub.2O.sub.3. In the present invention, an appropriate main formula correction process is used, and a suitable and inexpensive correcting agent and a functional additive are added to a ferrite material, such that the power loss of the prepared nickel-zinc ferrite material at 13.56 MHz can be significantly reduced.