Hydrogen impact on magnetic properties of metallic systems

Abstract A brief overview of the impact of presence of hydrogen in metallic systems on magnetic properties is given. Respective differences between the 4 f, 5 f, and 3d system are emphasized using examples of materials with similar crystal structure. The analysis is based on general aspects of H bonding in metallic environment, H expanding volume and polar bonding of H. Electronegativity is used as a convenient indicator quantifying the polar bonding character.