Journal
PHYSICAL REVIEW B
Volume 79, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.144419
Keywords
chromium alloys; circular dichroism; discrete Fourier transforms; magnetic moments; molecular magnetism; nanomagnetics; nickel alloys; oxidation; spin Hamiltonians; X-ray absorption spectra
Funding
- EU [515767, FP7-ICT]
- MolSpinQIP [211284]
- PRIN (IT)
- EPSRC (UK)
- Engineering and Physical Sciences Research Council [EP/D05138X/1] Funding Source: researchfish
- EPSRC [EP/D05138X/1] Funding Source: UKRI
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We deeply investigated the properties of submonolayer distributions of isolated molecular Cr7Ni rings deposited on Au(111) by liquid phase. X-ray absorption spectra measured at the Cr and Ni L-2,L-3 edges show that the grafting of the Cr7Ni rings onto the gold surface does not affect the oxidation state and the local symmetry of the Cr and Ni sites. The circular dichroism shows a change in sign of the Ni magnetic moment. This is due to a reduction in the exchange coupling constants that, however, preserves the structure of the low-energy levels of the grafted rings, as corroborated by spin-Hamiltonian simulations and comparison with measurements on bulk sample. Density-functional theory calculations show that the Ni-Cr bond gets weaker with slight ring distortion suggesting possible explanation for the observed magnetic behavior. These results show that complex magnetic molecules can be grafted onto surfaces, and that changes in their magnetic behavior must be examined in individual cases.
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