Journal
NANO LETTERS
Volume 15, Issue 6, Pages 4024-4028Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00987
Keywords
Magnetocrystalline anisotropy; spin excitation; strain-induced tuning; porphyrins; manipulation; scanning tunneling microscopy
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Funding
- DFG [FR2726/4]
- ERC Grant NanoSpin
- MINECO [MAT2013-46593-C6-01]
- Freie Universitat Berlin
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The magnetism, of single atoms and molecules is governed by the atomic scale environment. In general, the reduced symmetry of the surrounding splits the d states and aligns the magnetic moment along certain favorable directions. Here, we show that we can reversibly modify the magneto-crystalline anisotropy by Manipulating the environment of single iron(II) porphyrin molecules adsorbed on Pb(111) with the tip of a scanning tunneling microscope: When we decrease the tip molecule distance, we first observe a small increase followed by an exponential decrease of the axial anisotropy on the molecules. This is in contrast to the monotonous in-crease observed earlier for the same molecule with an additional axial Cl ligand (Nat. Phys. 2013, 9,705): We ascribe the changes in the anisotropy of both species to a deformation of the molecules in the presence of the attractive force of the tip, which leads to a change in the d level alignment. These experiments demonstrate the feasibility of a precise tuning of the magnetic anisotropy of an individual molecule by mechanical control.
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