Investigations of the magnetic moments in (Fe1–xMnx)3al alloys

Abstract

The average magnetic moment and the magnetic moments of the sublattices of (Fe1–xMnx)3Al alloys are determined from saturation magnetization and neutron diffraction. By Mössbauer experiments the effective magnetic fields on 57Fe nuclei are measured. The distribution of Fe, Mn, and Al on the three sublattices of the DO3 structure are determined by means of neutron and X‐ray diffraction. The observed decrease of magnetic moments with increasing Mn concentration is explained by the occurrence of parasitic antiferromagnetism. Also 55Mn spin‐echo measurements show the existence of antiferromagnetically coupled magnetic moments.

Electronic structure and the site preference of chromium in Fe3Al alloy

“…Indeed, it is known that when concentration of manganese in Fe 3-x Mn x Si exceeds x = 0.7, the manganese atoms start to occupy (A, C) positions in addition to the B-sites. This process takes place at even lower concentrations in Fe 3-x Mn x Al [9].…”

Magnetic Properties of DO3-Type Alloys Based on Fe3Si and Fe3Al

“…Unfortunately, there are experimental facts that contradict such a simple picture. The preference of Mn to occupation of B-sites is not so clear in Fe 3 Al alloys [12,13]. In the case of chromium substituting for iron the number of experiments [14][15][16] showed that chromium does not show any preference in Fe 3 Si while there is certain preference to occupation of B-sites in Fe 3 Al.…”

Optical properties of Fe2NiAl and Fe2MnAl Heusler alloys

“…The alloy is a ferrimagnet with the magnetic moments at the Fe and Mn atoms equal to -0.16 and +2.32 μ B , respectively. Note that in the few experimental works [10][11][12][13][14] the results of calculations have not been con firmed in either the mutual orientation of the moments or in the magnitude of the magnetic moment per formula unit. The type of magnetic ordering also has not been determined.…”