New Systems of Rare Earth Permanent Magnets for Generation of Extrahigh Magnetic Fields

The permanent magnet systems generating strong stray fields with large localization region

“…Systems of high-anisotropic magnets, which generate strong magnetic stray fields (SFs) namely the fields their strength exceeds the induction of the magnet material H4B r ¼ 4pM r [1][2][3][4][5][6][7], are of great interest as little-studied objects of magnetostatics and, besides, due to potentiality for various technical applications [8,9]. M r is the magnetization value of the magnet in zero external field (the magnet was premagnetized to saturation).…”

“…Two possible kinds of strong SFs exist for uniformly magnetized magnets, for example, in the form of prism, its combination or other bodies [4][5][6][7].…”

“…These fields studied in detail in Refs. [2,[4][5][6][7][8] have some characteristic features. The SF is tangent to the charged plane and its magnitude grows with approaching the edge according to a logarithmic law so it follows that such field will be strong at a small distance from the edge and can be several times greater than the induction.…”

“…narrow localization region the characteristic feature of such field is its strong inhomogeneity in this region. It is appropriate to note that depending on the form of the region the fields can be classified to two varieties of the SFs, namely as strong fields of ''linear'' type and ''point'' fields [6][7][8].…”

“…1(a)) the magnitude of such field equals to the material induction H ¼ B r ¼ 4pM r . As it will be shown below by combination of uniformly magnetized elements in such system we can achieve strong uniform fields with the localization region equal to characteristic magnet dimension a which is much more than for the fields of the first kind [4][5][6][7].…”