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Magnetooptic element exploiting spin chirality

2025-06-18 01:171230下载
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A magnetooptic element whose size is essentially that of a lattice, namely several angstroms in size of magnetic material and which at the same time has its exhibiting magnetooptic effect detectable is provided along with a magnetooptic disk, a memory device and a magnetooptical picture or image display with a storage capacity of several terabits per square inch or more, each using such a magnetooptic element. The magnetooptic element utilizes a gigantic effective magnetic filed based on a spin chirality formed by geometrically configuring the spin orientation and crystallographic structure of a certain solid material. The solid material exhibiting the spin chirality may be such as a pyrochlore type oxide compound whose chemical composition is represented by chemical formula : A2B2O7 where A is a rare-earth element and B is a transition metal, or a pyrochlore type oxide compound whose chemical composition is represented by chemical formula : (A1-xCx)2B2O7 where A is a rare-earth element, C is an alkali-earth metallic element and B is a transition metal and where 0
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