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AssigneeJapan Science and Technology Agency
InventorsHiroshi Yoshida, Masayoshi Seike, Kazunori Sato, Akira Yanase
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Disclosed is a ferromagnetic alkali chalcogen compound capable of providing a completely-spin-polarized transparent ferromagnetic material using an alkali chalcogen compound having light-transparency, and a method of adjusting ferromagnetic properties thereof. The transparent ferromagnetic alkali chalcogenide comprises an alkali chalcogen compound which has an anti-fluorite structure and contains at least one metal element selected from a 3d transition metal element group consisting of Ti, V, Cr, Mn, Fe, Co, Ni and Cu; a 4d transition metal element group consisting of Zr, Nb, Mo, Tc, Ru and Rh; a 5d transition metal element group consisting of Hf, Ta, W, Os, Re and Ir; and a lanthanum-series rare-earth element group consisting of Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. The selected metal element is incorporated in the alkali chalcogen compound in the form of a solid solution to provide a ferromagnetic characteristic thereto. The ferromagnetic properties are adjusted through control of valence states based, for example, on adjustment of a concentration of each of the metal elements, selection of a combination of two or more of the metal elements, and/or addition of an acceptor and a donor.
A single-crystal transparent ferromagnetic alkali chalcogenide comprising an alkali chalcogen compound which has an anti-fluorite structure and contains at least one metal element selected from a 4d transition metal element group consisting of Zr, Nb, Mo, Tc, Ru and Rh, said selected metal element being incorporated in said alkali chalcogen compound in the form of a solid solution to provide a ferromagnetic characteristic thereto.
A single-crystal transparent ferromagnetic alkali chalcogenide comprising an alkali chalcogen compound which has an anti-fluorite structure and contains at least one metal element selected from a 5d transition metal element group consisting of Hf, Ta, W, Os, Re and Ir, said selected metal element being incorporated in said alkali chalcogen compound in the form of a solid solution to provide a ferromagnetic characteristic thereto.
A single-crystal transparent ferromagnetic alkali chalcogenide comprising an alkali chalcogen compound which has an anti-fluorite structure and contains at least one metal element selected from a lanthanum-series rare-earth element group consisting of Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, said selected metal element being incorporated in said alkali chalcogen compound in the form of a solid solution to provide a ferromagnetic characteristic thereto.
A single-crystal transparent ferromagnetic alkali chalcogenide comprising an alkali chalcogen compound which has an anti-fluorite structure and contains at least one metal element selected from a 3d transition metal element group consisting of Ti, V, Cr, Mn, Fe, Co, Ni and Cu, said selected metal element being incorporated in said alkali chalcogen compound in the form of a solid solution to provide a ferromagnetic characteristic thereto.
Dependencies are inferred from the claim text.