Localized Magnetic States of Fe, Co, and Ni Impurities on Alkali Metal Films

Carlo Carbone; Cesare Grazioli; P. Gambardella; P. Ohresser; Sandra Gardonio; S. S. Dhesi

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Localized Magnetic States of Fe, Co, and Ni Impurities on Alkali Metal Films

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arxiv 2307.12433 v1 pith:5RIAN5J2 submitted 2023-07-23 cond-mat.mtrl-sci

P. Gambardella , S. S. Dhesi , Sandra Gardonio , Cesare Grazioli , P. Ohresser , Carlo Carbone This is my paper

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X-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) have been used to study transition metal impurities on K and Na films. The multiplet structure of the XAS spectra indicates that Fe, Co, and Ni have localized atomic ground states with predominantly d7, d8, and d9 character, respectively. XMCD shows that the localized impurity states possess large, atomiclike, magnetic orbital moments that are progressively quenched as clusters are formed. Ni impurities on Na films are found to be nonmagnetic, with a strongly increased d10 character of the impurity state. The results show that the high magnetic moments of transition metals in alkali hosts originate from electron localization.

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