Magnetised structure inducing a homogeneous field, in the centre thereof, with a pre-determined orientation

Abstract

A magnetized structure that induces in a central area of interest a homogeneous magnetic field of predetermined orientation relative to a longitudinal axis (z) of the structure comprises at least two magnetized rings () disposed symmetrically relative to a plane (P) that is perpendicular to the longitudinal axis (z) and that contains the central area of interest, and at least one median annular magnetized structure disposed at least partly between the two magnetized rings () and also disposed symmetrically relative to the plane (P) of symmetry, one of the two magnetized rings () being magnetized radially relative to the longitudinal axis (z) with divergent magnetization and the other of the two magnetized rings () being magnetized radially relative to the longitudinal axis (z) with convergent magnetization, and the median annular magnetized structure being magnetized with an orientation different from that of the magnetization of the two magnetized rings (). The median annular magnetized structure comprises at least one magnetized ring () having a magnetization distribution of orientation that varies as in Halbach dipoles and the first two magnetized rings () and the median annular magnetized structure are each divided into individual components in the form of regularly distributed identical sectors.