MAGNETIC FIELD GENERATOR HAVING PERMANENT MAGNETS

摘要

The invention relates to a magnetic field generator (1) having permanent magnets for a Faraday rotator, consisting of an arrangement around a common axis (Z) of magnetized rings that are aligned coaxially end to end so as to form substantially a hollow passage (5) for radiation (6), the axis of said hollow passage (5) being said common axis. The novelty of the invention lies in the geometric distribution of the discs constituting the magnetic structure, and this distribution makes it possible to obtain a magnetic field at the centre of the structure which increases as the logarithm of a dimensional ratio. The magnetic field generator according to the invention has in particular a structure with two magnetization directions, which separates the magnetization domains by conical surfaces or approximations to conical surfaces formed from cylinders and rings. The generator according to the invention may also have a structure with four magnetization directions, comprising rings with approximately radial incoming or outgoing magnetization.