Angstrom Technology Partnership

Agency of Industrial Science and Technology Ministry of International

Mitsubishi Electric Corporation

Sanyo Electric Co., Ltd.

Japan As Represented by Director General of Agency of Industrial Science

Yasuhide Tomioka

Yoshinori Tokura

Kenjiro Miyano

Hideki Kuwahara

Atsushi Asamitsu

Takehito Tanaka

Keiichiro Kobayashi

Tsuyoshi Kimura

A manganese oxide material has MnO.sub.3 as a matrix. It is an antiferromagnetic insulator and, when subjected to an electrical current or electric field, it is transformed into a ferromagnetic metal.

Manganese oxide material having MnO.sub.3 as a matrix

A magnetoresistor with an ordered double perovskite structure is an oxide crystal which has an ordered double perovskite crystal structure represented by the general formula of A.sub.2 BB'O.sub.6, wherein A stands for Sr atoms, B for Fe atoms and B' for Mo or Re atoms and wherein the Fe atoms and the Mo or Re atoms are alternately arranged and which exhibits negative magnetoresistive characteristics.

Magnetoresistor with ordered double perovskite structure and method for

A manganese oxide material that can be used as a switching device or as a memory device or the like is formed of Mn-based oxide material. The Mn-based oxide material exhibits insulator-to-metal transitions induced by irradiating the material with laser light.

Proposed is a grain boundary-free crystalline body of a perovskite structure having a chemical composition of the formula Pr.sub.1-x M.sub.x MnO.sub.3, in which M is calcium or strontium and the subscript x is a number of 0.3 to 0.5, which exhibits a magnetoresistance behavior with a phase transition between an insulator phase and a ferromagnetic metallic phase accompanied by the phenomenon of hysteresis. This grain boundary-free crystalline body can be obtained by subjecting a sintered body of a powder blend consisting of the oxides of praseodymium, manganese and calcium or strontium to a crystal growing treatment by the floating zone-melting method in an atmosphere of oxygen.

Grain boundary-free crystalline body of manganese-based composite oxide

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Tsukuba, Japan

Yasuhide Tomioka