Research Institute for Electromagnetic Materials

Nobukiyo Kobayashi

Kenji Ikeda

KenIchi Arai

Tadayoshi Iwasa

Satoshi Iwamoto

Yasutomo Ota

An object of the present invention is to provide a new nanogranular structure material having magneto-optical properties different from those of existing nanogranular structure materials, and a method for producing the same. The nanogranular structure material has a composition represented by L-M-F—O wherein L is at least one element selected from the group consisting of Fe, Co, and Ni, and M is at least one element selected from the group consisting of Li, Be, Mg, Al, Si, Ca, Sr, Ba, Bi, and rare earth elements, F is fluorine, and O is oxygen. The nanogranular structure material according to the present invention is composed of a matrix formed of a fluorine compound having a composition represented by M-F and metal oxide nanoparticles dispersed in the matrix and having a composition represented by L-O.

Nanogranular structure material and method for producing same

An object of the present invention is to provide a magneto-optical material capable of exhibiting the Faraday effect even though no magnetic field is applied. The magneto-optical material of the present invention has a nanogranular structure in which magnetic nanoparticles are dispersed in a fluoride matrix, and can exhibit Faraday properties without requiring the application of a magnetic field because the magnetic nanoparticles are configured by a magnetic material that has residual magnetization and consists of any of a Fe—Pt alloy, a Co—Pt alloy, a Fe—Co—Ni—Al alloy, a Co ferrite, or a Ba ferrite.

Magneto-optical material and method for producing same

Provided are a magneto-optical material capable of enhancing the tunable range of magneto-optical properties such as the Faraday rotation angle, and a method for producing the same. The temperature of a substrateis controlled to a first temperature within the range of 300 to 800 [° C.], and the atmospheric pressure of the substrateis controlled to 1.0×10[Pa] or less (first step). Using a composite target or plurality of individual targets of a TCO material exhibiting ENZ properties in the infrared wavelength region, together with a magnetic metal, a magneto-optical materialis deposited on the substratewhile the temperature of the substrateis controlled to a second temperature within the range of 300 to 800 [° C.], and the atmospheric pressure of the substrateis controlled to the range of 0.1 to 10 [Pa] (second step).

Growing community of inventors

Tomiya, Japan

Nobukiyo Kobayashi