We present an overall view of the way alignment and magnitude of magnetic moments in the 3d transition metals from Cr through to Cu vary through this series. A major aid in this study has been the theoretical work by Riane et al. on hydrogen in interstitial positions in fcc Co for both CoH and, especially, CoH. Their study led us to understand how the magnetic moment in fcc Ni, Ni being the united atom of separated atoms Co and H, was reduced in going from CoH through to Ni and removed in passing from Ni to Cu. Turning to Cr, we have next considered its bcc structure as related to bcc V, with H in interstitial sites. More difficult is passing from Cr to Mn, the two metallic monoatomic antiferromagnetic (AF) elements in the 3d series, though some results exist on bcc V with H again in interstitial sites. Some remarks are then made on the complex crystal structure of AF Mn. Finally, a brief comment is added on a fairly recent study of the YCo-H system.

This work has been partially supported by the Project [FIS2013-48286-C2-1-P] of the Spanish Ministry of Economyand Competitiveness MINECO; the Basque Government under the ETORTEK Program 2014 [nanoGUNE2014];and the University of the Basque Country [Grant No. IT-366–07].

Peer reviewed

Letter