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US 7,071,687 B2Granted
Photomagnetic field sensor
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakenori Sekijima, Mikio Geho, Takashi Fujii
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Abstract
A photo magnetic field sensor includes a Faraday rotator made of a paramagnetic material, a polarizer, an analyzer, a light-irradiating element, and a light-sensing element. The Faraday rotator is made of a paramagnetic garnet single crystal including at least Tb and Al.
Claims16
A photo magnetic field sensor comprising:
- a Faraday rotator including a paramagnetic material, a polarizer, an analyzer, a light-irradiating element, and a light-sensing element;
- wherein
- the paramagnetic material is made of a paramagnetic garnet single crystal consisting essentially of an oxide of Tb, and Al and at least one of Pr and Ce.
A photo magnetic field sensor comprising:
- a Faraday rotator including a paramagnetic material, a polarizer, an analyzer, a light-irradiating element, and a light-sensing element;
- wherein
- the paramagnetic material has a columnar shape in which a diameter A in mm of the column of the Faraday rotator and a distance B in mm between one end of the Faraday rotator and the other end thereof satisfies 0<A≦2 and 1≦B/A≦10;
- and
- the paramagnetic material is made of a paramaganetic single crystal consisting essentially of an oxide of Tb, Al and at least one of Pr and Ce.
2 more elements
Dependencies are inferred from the claim text.