Molecular Spintronics

Controlling the Magnetization Direction in Molecules via Their Oxidation State

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Schematic view of the highest occupied and the lowest unoccupied energy levels of Eu2(C8H8)3 ionic species. The magnetic anisotropy energy (MAE) favors the in-plane magnetization for the Eu2(C8H8)30 and Eu2(C8H8)3+2, while the perpendicular to plane magnetization (z) is favored for the Eu2(C8H8)3-1 and Eu2(C8H8)3+1.

( N. Atodiresei )


Tailoring the Magnetic Properties at Hybrid Interfaces

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The spin polarization of a ferromagnetic surface can be locally tailored by flat adsorbing organic molecules containing π (pz)-electrons onto it. The complex energy dependent magnetic structure created at the organic molecule-surface interface resembles the pz-d exchange type mechanism and leads to the inversion of the spin polarization at the organic site. Although the adsorbed molecules are nonmagnetic, due to an energy dependent spin polarization, in a given energy interval the molecules have a net magnetization density delocalized over the molecular plane. These results demonstrate the possibility to selectively and efficiently inject spin-up and spin-down electrons from a ferromagnetic-organic interface, an effect which can be exploited in future spintronic devices.

( N. Atodiresei )

Spin- and energy-dependent tunneling through a single molecule with intramolecular spatial resolution

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Comparison between experimental and simulated spin-polarized scanning tunneling microscopy images for a cobalt-phthalocyanine adsorbed on the 2ML Fe/W(110) surface.

Our studies demonstrate that electrons of different spin [i.e. up (↑) and down (↓)] can selectively be injected from the same ferromagnetic surface by locally controlling the inversion of the spinpolarization.

References:

4. Atodiresei, N.; Caciuc, V.; Lazic, P.; Blügel, S.; “Engineering the magnetic properties of hybrid organic-ferromagnetic interfaces by molecular chemical functionalization”, Physical Review B 2011, 84, 172402.

3. Atodiresei, N.; Brede, J.; Lazic, P.; Caciuc, V.; Hoffmann, G.; Wiesendanger, R.; Blügel, S.; “Design of the local spin polarization at the organic-ferromagnetic interface”, Physical Review Letters 2010, 105, 066601.
Highlight paper: Physical Review Letters Cover Letter (http://prl.aps.org/covers/105/6), Editors' Suggestion and featured in Physics- spotlighting exceptional research (http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.105.066601),
Featured in Nature – News & Views (Nature 2010, 467, 664).

2. Brede, J.; Atodiresei, N.; Kuck, S.; Lazic, P.; Caciuc, V.; Morikawa, Y.; Hoffmann, G.; Blügel, S.; Wiesendanger R.; “Spin- and energy-dependent tunneling through a single molecule with intramolecular spatial resolution”, Physical Review Letters 2010, 105, 047204.
Highlight paper: Featured in Nature – News & Views (Nature 2010, 467, 664) and Nature Physics – News & Views (Nature Physics 2010, 6, 562).

1. Atodiresei, N.; Dederichs, P. H.; Mokrousov, Y.; Bergqvist, L.; Bihlmayer, G.; Blügel, S.; “Controlling the magnetization direction in molecules via their oxidation state”, Physical Review Letters 2008, 100, 117207. 

( N. Atodiresei )

Last Modified: 24.03.2022