Room-Temperature On-Spin-Switching and Tuning in a Porphyrin-Based Multifunctional Interface
Henning Maximilian Sturmeit1, Iulia Cojocariu2, Andreas Windischbacher3
1TU Dortmund University, Experimental Physics VI, 44227, Dortmund, Germany.
Small (Weinheim an Der Bergstrasse, Germany)
|October 13, 2021
Summary
Molecular interfaces enable new opto-electronics and spintronics. Charge transfer at nickel-copper interfaces switches nickel
Area of Science:
- Materials Science
- Surface Science
- Quantum Chemistry
Background:
- Molecular interfaces are crucial for advanced electronic devices.
- Metal-molecule interactions can modify material properties.
Purpose of the Study:
- To investigate spin and oxidation state changes in nickel tetraphenyl porphyrins at copper interfaces.
- To explore the functionalization of nickel ions and their impact on electronic properties.
Main Methods:
- Combined theoretical and experimental spectro-microscopy.
- Analysis of charge transfer at metal-molecule interfaces.
Main Results:
- Charge transfer induced a switch from Ni(II) (S=0) to Ni(I) (S=1/2).
- Nitrogen dioxide functionalization of Ni(I) shifted the state to Ni(II) (S=1).
- The porphyrin macrocycle's electronic structure remained unchanged.
Conclusions:
- Nickel acts as a reversible spin switch in these systems.
- Porphyrin-based interfaces offer a platform for multifunctional devices.
- Magnetism and optical/transport properties can be independently controlled.
