arXiv · 1910.13135
Large orbital magnetic moments of small, free cobalt cluster ions Co$_n^+$ with $n \leq 9$
Abstract
The size dependent electronic structure and separate spin and orbital magnetic moments of free Co$_n^+$ ($n = 4\;\textrm{-}\;9$) cluster ions have been investigated by x-ray absorption and x-ray magnetic circular dichroism spectroscopy in a cryogenic ion trap. A very large orbital magnetic moment of $1.4\pm0.1\;\mu_{\mathrm B}$ per atom was determined for Co$_5^+$, which is one order of magnitude larger than in the bulk metal. Large orbital magnetic moments per atom of $\approx 1\;\mu_B$ were also determined for Co$_4^+$, Co$_6^+$, and Co$_8^+$. The orbital contribution to the total magnetic moment shows a non-monotonic cluster size dependence: The orbital contribution increases from a local minimum at $n = 2$ to a local maximum at $n = 5$ and then decreases with increasing cluster size. The $3d$ spin magnetic moment per atom is nearly constant and is solely defined by the number of $3d$ holes which shows that the $3d$ majority spin states are fully occupied, that is, $3d$ hole spin polarization is 100%.
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V Zamudio-Bayer, K Hirsch, A Langenberg, A Ławicki, A Terasaki, B von Issendorff, J T Lau. 2019-10-29. Large orbital magnetic moments of small, free cobalt cluster ions Co$_n^+$ with $n \leq 9$. https://doi.org/10.1088/1361-648x%2Faae54a
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