Room-Temperature Spin-Dependent Transport in Metalloporphyrin-Based Supramolecular Wires

Albert C. Aragonès, Alejandro Martín-Rodríguez, Daniel Aravena, Giuseppe di Palma, Wenjie Qian, Josep Puigmartí-Luis, Núria Aliaga-Alcalde, Arántzazu González-Campo, Ismael Díez-Pérez, Eliseo Ruiz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Here we present room-temperature spin-dependent charge transport measurements in single-molecule junctions made of metalloporphyrin-based supramolecular assemblies. They display large conductance switching for magnetoresistance in a single-molecule junction. The magnetoresistance depends acutely on the probed electron pathway through the supramolecular wire: those involving the metal center showed marked magnetoresistance effects as opposed to those exclusively involving the porphyrin ring which present nearly complete absence of spin-dependent charge transport. The molecular junction magnetoresistance is highly anisotropic, being observable when the magnetization of the ferromagnetic junction electrode is oriented along the main molecular junction axis, and almost suppressed when it is perpendicular. The key ingredients for the above effect to manifest are the electronic structure of the paramagnetic metalloporphyrin, and the spinterface created at the molecule–electrode contact.

Original languageEnglish
Pages (from-to)25958-25965
Number of pages8
JournalAngewandte Chemie - International Edition
Volume60
Issue number49
Early online date2 Nov 2021
DOIs
Publication statusPublished - 1 Dec 2021

Keywords

  • density functional calculations
  • magnetoresistance
  • metalloporphyrins
  • single-molecule junctions
  • spinterface

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