Magnetic properties of amorphous Fe100−xErx alloys

Sperimagnetism in Fe78Er5B17and Fe64Er19B17metallic glasses: I. Moment values and non-collinear components

“…The values which were used previously in the calculation of three spin-flip cross-sections [12] are given in the left hand columns of the Table. They were based on an LRM and on the published literature [5,6,9]. The Table shows that the values of Comparing the present moment values with those obtained elsewhere, the new value of || Er µ = 6.58 B means that the total moment on the erbium atoms must be in the region of Er µ ≈ 8.8 B , if the random cone angle is Er ≈ 60º as suggested in [9].…”

“…The (Fe,Er) -based glasses also exhibit ferrimagnetic compensation as a function of composition [5,6] and temperature [6,9]. We therefore made a preliminary study of a The magnetisation data and its analysis using a phenomenological model, will be presented in Figure 1 of [9], including the field dependence of the magnetisation.…”

“…These non spin-flip cross-sections of the (Fe,Tb) 83 B 17 glasses were nevertheless successfully simulated, by using a combination of known and derived partial structure factors [4]. Magnetisation, Mössbauer spectroscopy and X-ray magnetic circular dichroism (XMCD) measurements on (Fe,Er)BSi glasses [5]; amorphous FeEr alloys [6,7,8] and a single Fe 66 Er 19 B 15 glass [9], suggest that (Fe,Er) 83 B 17 are non-collinear ferrimagnets. They have been described by a sperimagnetic structure [10] in which the magnetic moments on the iron atoms point in a random cone that is ferrimagnetically coupled to a random cone of erbium moments.…”

Sperimagnetism in Fe78Er5B17and Fe64Er19B17metallic glasses: II. Collinear components and ferrimagnetic compensation

“…It is difficult therefore, to find the unique choice of the components of the moments, even from a combination of different bulk measurements [4,5,6,7,8]. …”

“…The related (Fe,Er) 83 B 17 glass have been shown to be a non-collinear ferrimagnets by a variety of different measurements [4,5,6,7,8], but our preliminary neutron scattering measurements on a Fe 64 Er 19 B 17 glass at 1.5K, 60K and 180K proved to be difficult to interpret [9]. The finite spin-flip cross-sections confirmed the presence of a non-collinear state and could be analysed using a sperimagnetic structure in which the magnetic moments on the iron atoms point in a random cone that is ferrimagnetically coupled to a random cone of erbium moments.…”