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By applying a magnetic field whose Zeeman energy exceeds the Kondo energy byan order of magnitude the ground state of the Friedel-Anderson impurity is amagnetic state. In recent years the author introduced the Friedel ArtificiallyInserted Resonance (FAIR) method to investigate impurity properties. Withinthis FAIR approach the magnetic ground state is derived. Its full excitationspectrum and the composition of the excitations is calculated and numericallyevaluated. From the excitation spectrum the electron density of states iscalculated. Majority and minority d-resonances are obtained. The width of theresonances is about twice as wide as the mean field theory predicts. Thisbroadening is due to the fact that any change of the occupation of the d-statein one spin band changes the eigenstates in the opposite spin band and causestransitions in both spin bands. This broadening reduces the height of theresonance curve and therefore the density of states by a factor of two. Thisyields an intuitive understanding for a previous result of the FAIR approachthat the critical value of the Coulomb interaction for the formation of amagnetic moment is twice as large as the mean field theory predicts.

Density of States in the Magnetic Ground State of the Friedel-Anderson Impurity