(leer)

Navigation und Service


Molecular Spintronics

Controlling the Magnetization Direction in Molecules via Their Oxidation State

MolSpinPkt1.jpg

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

MolSpinPkt2.jpg

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

MolSpinPkt3.jpg

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 )


Servicemenü

Homepage