TY - JOUR
T1 - Large orbital magnetic moments of small, free cobalt cluster ions Co+ n with n ≤ 9
AU - Zamudio-Bayer, V.
AU - Hirsch, K.
AU - Langenberg, A.
AU - Ławicki, A.
AU - Terasaki, A.
AU - Von Issendorff, B.
AU - Lau, J. T.
N1 - Funding Information:
We thank HZB for the allocation of synchrotron radiation beamtime at the beamline UE52PGM. The superconducting magnet was provided by Toyota Technological Institute. AT acknowledges financial support by Genesis Research Institute, Inc. This project was partially funded by the German Federal Ministry for Education and Research (BMBF) under Grant No. BMBF05K13VF2 and No. BMBF05K16VF1. BvI acknowledges travel support by HZB.
Publisher Copyright:
© 2018 IOP Publishing Ltd.
PY - 2018/10/30
Y1 - 2018/10/30
N2 - The size dependent electronic structure and separate spin and orbital magnetic moments of free Co+ n (n = 4.9) 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 0.1 μB 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 .1 μB were also found for Co+4 , Co+6 , and Co+8 . The orbital contribution to the total magnetic moment shows a nonmonotonic 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%.
AB - The size dependent electronic structure and separate spin and orbital magnetic moments of free Co+ n (n = 4.9) 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 0.1 μB 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 .1 μB were also found for Co+4 , Co+6 , and Co+8 . The orbital contribution to the total magnetic moment shows a nonmonotonic 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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U2 - 10.1088/1361-648X/aae54a
DO - 10.1088/1361-648X/aae54a
M3 - Article
C2 - 30270848
AN - SCOPUS:85055646576
SN - 0953-8984
VL - 30
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 46
M1 - 464002
ER -