Local Magnetic Moment Associated with an Iron Atom Dissolved in Various Transition Metal Alloys

Abstract

One atomic percent of iron has been dissolved in a series of alloys of the second row transition metals. The alloys have been chosen so as to give closely spaced coverage from zirconium to beyond palladium.For each dilute iron alloy, the susceptibility x has been measured from 1. 4'K to room temperature. In some members of the series, the susceptibility is essentially temperature independent, while in others the appearance of a local moment is evidenced by a Curie-Weiss dependence of x on T. A local moment Grst appears proceeding from Nb to Mo at about (Nbs. qMo0, 4)Q, 99Feo 01 and persists nearly to Re. Disappearing at this point, the moment reappears at (Rus, 7$Rhp, gn)p, g9Fep, st and continues, becoming large in the alloys near Pd.The occurrence of local moments is discussed in terms of the band structure of the alloys and the perturbation introduced by the iron atom. The giant magnetic moments observed near Pd are related to the large susceptibilities of the iron-free alloys in this region.

Magnetic properties of Fe embedded in V and Cr:ff Thin films and dilute alloys

“…In the early 1960s Matthias et al 1 and Clogston et al 2 found that Fe impurities are magnetic in Mo, but nonmagnetic in Nb. These experimental findings were confirmed in the late 1980s by Riegel et al, 3 who found that Fe impurities are generally magnetic in group-VIb metals, but nonmagnetic in group-Vb metals.…”

Local moment physics in heavy electron systems

“…2 In the early 1960s, Clogston, Mathias and collaborators [7] showed that when small concentrations n i of magnetic ions, such as iron are added to a metallic host, they develop a Curie component to the magnetic susceptibilty…”

“…When iron is dissolved in molybdenum, the lower density of states causes U > U c , and local moments form. [7] 4 The quantity δ σ = cot −1 E d +Un d−σ ∆ is actually the phase shift for scattering an electron off the dresonance (see exercise), and the identity n dσ = 1 π δ σ is a particular realization of the "Friedel sum rule", which relates the charge bound in an atomic potential to the number of nodes (= ∑ σ δ σ π ) introduced into the scattering state wavefunction.…”

Proximity effects on dimensionality and magnetic ordering in Pd/Fe/Pd trialyers

“…A clear example is where proximity effects induce magnetic moments at interfaces. This is readily achieved in many non-magnetic transition metals through indirect exchange coupling to magnetic impurities 10 . The extension of non-uniform magnetization is, therefore, not restricted to within the ferromagnetic layer but is a more general interfacial phenomenon.…”

“…10,12 This material combination is therefore a good representative example of a system with extreme interface effects and can be viewed as a model system for addressing the effects of interfacial ferromagnetic proximity on the magnetic ordering. Previous studies of the temperature dependence of the magnetization, determined from measurements using the Magneto-Optical Kerr Effect (MOKE), are consistent with a cross-over in the spatial dimensionality (from 2D to 3D) for Fe thicknesses in the range of 0.5 − 1.0 ML 12 .…”