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Updated: May 24, 2026

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Published on: February 5, 2022
Spin coupling and orbital angular momentum quenching in free iron clusters
M Niemeyer1, K Hirsch, V Zamudio-Bayer
1Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany.
Researchers studied magnetic moments in iron clusters (Fe{n}{+}). They found spin moments largely survived bonding, while orbital moments were significantly quenched, even in small clusters.
Area of Science:
- Condensed matter physics
- Atomic and molecular physics
- Materials science
Background:
- Understanding magnetic properties of nanoscale materials is crucial.
- Iron clusters exhibit unique magnetic behaviors distinct from bulk iron.
Purpose of the Study:
- To determine the magnetic spin and orbital moments of size-selected free iron cluster ions (Fe{n}{+}).
- To investigate the effect of cluster size and atomic arrangement on magnetic coupling.
Main Methods:
- X-ray magnetic circular dichroism (XMCD) spectroscopy was employed.
- Size-selected free iron cluster ions (Fe{n}{+}) with n=3-20 were analyzed.
Main Results:
- Ferromagnetic coupling was observed in most iron clusters.
- An exception was Fe{13}{+}, showing antiferromagnetic coupling of the central atom.
- Orbital magnetic moments were significantly quenched (5%-25% of atomic value), while spin moments remained high (60%-90%).
Conclusions:
- Bond formation in homonuclear iron clusters quenches orbital angular momenta.
- This quenching effect is significant even at small coordination numbers, preceding bulk behavior.
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