Magnetic States in 3d Transition Metal Hydrides Probed by X-ray Magnetic Circular Dichroism

Abstract

  X-ray magnetic circular dichroism (XMCD) study of 3d transition metal hydrides FeH, CoH, and NiH is presented. The hydrogen effects on the electronic structure and magnetic states have been investigated. This study reveals that ferromagnetic Ni transforms to nonmagnetic NiH, whereas FeH and CoH remain ferromagnetic after the hydrogenation. The XMCD profiles indicate that the electronic states of 3d electron near the Fermi energy are modified as a result of the hydrogenation. In this article, the stability of the ferromagnetic state in FeH and CoH is also discussed.