Magnetooptic element exploiting spin chirality

Details Magnetooptic element exploiting spin chirality Magnetooptic element exploiting spin chirality

2006-01-10

2006-01-10

Epps, Georgia (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

Reexamination Certificate

active

06985276

ABSTRACT:
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: A2B2O7where 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)2B2O7where A is a rare-earth element, C is an alkali-earth metallic element and B is a transition metal and where 0<x<1.

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Notification of Transmittal of Copies of Translation of the International Preliminary Examination Report dated Jul. 8, 2004 and received by our foreign associated on Jul. 12, 2004.

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