Magnetic Moments and Unpaired Spin Densities in the Fe-Rh Alloys

 

 

G. Shirane, R. Nathans, and C. W. Chen

Phys. Rev. 134, A1547 – Published 15 June 1964

 

Abstract

The distribution of magnetic moments in the Fe-Rh system has been investigated by the neutron diffraction technique in the composition range between 35 and 50 at.%Rh. These alloys have chemical order of CsCl type; the body-corner positions are occupied by FeI atoms and the body centers by Rh and FeII atoms. The magnetic moments in ferromagnetic alloys containing 35, 40, and 48% Rh are ${\mu }_{\mathrm{FeI}}=3.1$ ${\mu }_B$, ${\mu }_{\mathrm{FeII}}=2.5$ ${\mu }_B$, and ${\mu }_{\mathrm{Rh}}=1.0$ ${\mu }_B$ at 25°C. The moment of the FeI atom in the 50% Rh alloy, which is antiferromagnetic at room temperature, increases to 3.3 ${\mu }_B$. A detailed study of the unpaired spin density distribution in the 48% Rh alloy was made by the polarized beam technique. While the FeI atom has a nearly spherical density distribution, that of the Rh atom shows a strong tendency towards $e_g$ symmetry. The coherent nuclear scattering amplitude of Rh was determined to be 0.585±0.005×${10}^{-12}$ cm.

• Received 22 January 1964

DOI:https://doi.org/10.1103/PhysRev.134.A1547

©1964 American Physical Society

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