Magnetic monopoles in ferromagnetic materials

Abstract

The interactions of slow (10−5 ⪝ v/c ⪝ 10−2) magnetic monopoles with ferromagnetic materials are studied. The spin-flip cross section σ and the energy loss dE/dx are calculated for magnetic monopoles impinging parallel to the magnetization direction. In iron, these reach a maximum at v/c ∼ 3 × 10−4, where they take the value of 100 Å2 and 100 MeV/cm respectively. The electromagnetic signal of a monopole passing through a ferromagnet and the generation of spin waves are discussed.