000819904 001__ 819904 000819904 005__ 20210129224412.0 000819904 0247_ $$2doi$$a10.1021/acs.nanolett.6b01344 000819904 0247_ $$2ISSN$$a1530-6984 000819904 0247_ $$2ISSN$$a1530-6992 000819904 0247_ $$2WOS$$aWOS:000379794200048 000819904 0247_ $$2altmetric$$aaltmetric:8466947 000819904 0247_ $$2pmid$$apmid:27248465 000819904 0247_ $$2Handle$$a2128/22759 000819904 037__ $$aFZJ-2016-05480 000819904 082__ $$a540 000819904 1001_ $$0P:(DE-Juel1)161546$$aAzpiroz, Julen Ibanez$$b0$$eCorresponding author 000819904 245__ $$aZero-Point Spin-Fluctuations of Single Adatoms 000819904 260__ $$aWashington, DC$$bACS Publ.$$c2016 000819904 3367_ $$2DRIVER$$aarticle 000819904 3367_ $$2DataCite$$aOutput Types/Journal article 000819904 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1478093857_9976 000819904 3367_ $$2BibTeX$$aARTICLE 000819904 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000819904 3367_ $$00$$2EndNote$$aJournal Article 000819904 520__ $$aStabilizing the magnetic signal of single adatoms is a crucial step toward their successful usage in widespread technological applications such as high-density magnetic data storage devices. The quantum mechanical nature of these tiny objects, however, introduces intrinsic zero-point spin-fluctuations that tend to destabilize the local magnetic moment of interest by dwindling the magnetic anisotropy potential barrier even at absolute zero temperature. Here, we elucidate the origins and quantify the effect of the fundamental ingredients determining the magnitude of the fluctuations, namely, the (i) local magnetic moment, (ii) spin–orbit coupling, and (iii) electron–hole Stoner excitations. Based on a systematic first-principles study of 3d and 4d adatoms, we demonstrate that the transverse contribution of the fluctuations is comparable in size to the magnetic moment itself, leading to a remarkable ≳50% reduction of the magnetic anisotropy energy. 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