The magnetoelectrochemical switch

Petru Lunca Popa, Neil T. Kemp, Hicham Majjad, Guillaume Dalmas, Vina Faramarzi, Christian Andreas, Riccardo Hertel, Bernard Doudin

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In the field of spintronics, the archetype solid-state two-terminal device is the spin valve, where the resistance is controlled by the magnetization configuration. We show here how this concept of spin-dependent switch can be extended to magnetic electrodes in solution, by magnetic control of their chemical environment. Appropriate nanoscale design allows a huge enhancement of the magnetic force field experienced by paramagnetic molecular species in solutions, which changes between repulsive and attractive on changing the electrodes' magnetic orientations. Specifically, the field gradient force created within a sub-100-nm-sized nanogap separating two magnetic electrodes can be reversed by changing the orientation of the electrodes' magnetization relative to the current flowing between the electrodes. This can result in a breaking or making of an electric nanocontact, with a change of resistance by a factor of up to 103. The results reveal how an external field can impact chemical equilibrium in the vicinity of nanoscale magnetic circuits.

Original languageEnglish (US)
Pages (from-to)10433-10437
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number29
StatePublished - Jul 22 2014


  • Electrochemistry
  • Magnetohydrodynamics
  • Supramolecular chemistry


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