Abstract: There is provided a process for producing a dielectric thin film of a perovskite oxide on a substrate by a vapor-deposition process which includes vaporizing the oxide and irradiating the oxide vapor or the substrate with a laser beam.There is also provided a pyroelectric type of sensor comprising: a MOS element including a drain electrode, a source electrode, a gate electrode and an Si semiconductor and a film of a ferroelectric or pyroelectric material formed on the drain electrode, the drain electrode being made of a material which exhibits a good ohmic contact with Si or SiO.sub.2 and has a lattice constant close to that of ferroelectric or pyroelectric material.

Abstract: An electrode in an electronic device using a functional thin film facilitates epitaxial growth during the functional material film-forming process and prevents the generation of cracks due to thermal stress. An oxide superconductor is using as an electrode material, thereby forming the crystal structure identical with the crystal structure of a functional thin film, and rendering their lattice constant and coefficient of thermal expansion close to the lattice constant and coefficient of thermal expansion functional thin film. According to the electrode material, high electric conductivity, low thermal conductivity and large thermal absorption coefficient characteristics can also be obtained.

Abstract: There is provided in a process for depositing a metal oxide superconducting film on a substrate by laser sputtering, the improvement which comprises carrying out the deposition of the metal oxide superconducting film in the presence of a gas having higher oxidation potential than oxygen.

Abstract: A method for producing ferromagnetic powder comprising metal oxide magnetic powder particles and a magnetic metal layer of at least one metal selected from the group consisting of iron, cobalt and nickel which layer is formed on a surface of the powder particle and has a magnetic easy axis of magnetization in substantially the same direction as that of the powder particle, which has improved coercive force and saturation magnetization, comprising irradiating with light a liquid medium dispersion containing the metal oxide magnetic particles, a reducing agent, and at least one metal ion selected from the group consisting of iron ion, cobalt iron, and nickel iron.

Abstract: A magnetic recording medium with high output power and improved durability which comprises a nonmagnetic substrate and a magnetic layer formed thereon containing magnetic powder and a binder, wherein the magnetic powder comprises a nuclear crystal consisting of magnetic oxide powder and a magnetic metallic layer formed thereon containing cobalt, and the magnetic layer has coercive force of not more than 1,000 Oe and saturation magnetic fluex density of not less than 1,800 gauss.

Abstract: A single crystal of lanthanum hexaboride is used as a tip of a thermionic emission cathode.