Rotating‐Field Technique for Galvanomagnetic Measurements

摘要: The isothermal galvanomagnetic behavior of an isotropic conductor in a magnetic field can be described by the vector equation E=ρ⊥j+n(j·n) (ρ∥−ρ⊥)+ρH(n×j), relating electric E to current density j. resistivities ρ∥ and ρ⊥ are those which result when induction is parallel j, and normal respectively; ρH Hall resistivity. n unit has direction induction. When j directed along x axis, made rotate x‐y plane with angular frequency ω, one obtains ac components Ẽx=12jx(ρ∥−ρ⊥) cos2ωt,Ẽy=12jx(ρ∥−ρ⊥) sin2ωt. These equations describe magnetoresistive effects rotating field. On other hand, if allowed x‐z plane, y component becomes Ẽy=ρHjxsinωt. This describes effect By measuring having frequencies ω 2ω jx known, ρ∥−ρ⊥ determined.T...