Atomic and magnetic structure of the Heusler alloys Ni2MnSb, Ni2MnSn, and Co2MnSn

Abstract

Saturation magnetization, X‐ray and neutron diffraction measurements were made on ferromagnetic alloys in the compositions Ni2MnSb, Ni2MnSn, and Co2MnSn. The compounds investigated have a crystallo‐chemical structure of L21 type, with a partial disorder among NiSb atoms in the case of Ni2MnSb and Ni(Co)‒Mn atoms in that of Ni2MnSn and Co2MnSn. It was also found that in Heusler alloys the Ni atoms have zero magnetic moment, but the Co atom has a magnetic moment different from zero. The values of the magnetic moment of Mn and Co atoms were also calculated at 80 °K and found to be μMn = 3.60 to 3.75 μB, μCo = 0.7 μB.

An Ab Initio Study of Pressure-Induced Changes of Magnetism in Austenitic Stoichiometric Ni2MnSn

“…The magnetic moments obtained for Ni, Mn and Sn atoms, 0.26 µ B , 3.53 µ B and −0.05 µ B , respectively, are similar to previous theoretical values (0.21 µ B , 3.73 µ B and −0.05 µ B , respectively [21]) as well as experimental data of 3.60 to 3.75 µ B reported for Mn in Ref. [62].…”

Magnetic-Field-Induced Effects in Martensitic Heusler-Based Magnetic Shape Memory Alloys

“…These lie on the bcc-branch of the curve. Experimental data for Ni-Mn-Z are shown with the smaller filled symbols Castelliz, 1951;Enkovaara et al, 2003;Helmholdt and Buschow, 1987;Helmholdt et al, 1984;Kanomata et al, 1987;Krén et al, 1968;Murakami et al, 1981;Sobczak, 1981;Stager and Campbell, 1978;Szytuła et al, 1972). These values are related to the magnetic moment in the L2 1 austenite phase only, and those related to the martensite state are excluded.…”

Magnetic Symmetry in Several Cubic Compounds

“…The Heusler alloys NiMnSb [3], Ni,MnSb [4], and Co,MnSn [4] have ferromagnetic order only for the Mn atoms (4 c sites) with the spin directions not yet determined. It was stated by neutron diffraction that the Heusler alloy Ni,MnSn [4] is a ferrimagnet having the Mn spins from the 4 a sites (oriented probably parallel to the (1 11) axis) coupled antiferromagnetically with the Mn spins from the 4 c sites.…”