Tunable giant magnetoresistance in a single-molecule junction

Abstract

Controlling electronic transport through a single-molecule junction is crucial for molecular electronics or spintronics. In magnetic molecular devices, the spin degree-of-freedom can be used to this end since the magnetic properties of the magnetic ion centers fundamentally impact the transport through the molecules. Here we demonstrate that the electron pathway in a single-molecule device can be selected between two molecular orbitals by varying a magnetic field, giving rise to a tunable anisotropic magnetoresistance up to 93%. The unique tunability of the electron pathways is due to the magnetic reorientation of the transition metal center, resulting in a re-hybridization of molecular orbitals. We obtain the tunneling electron pathways by Kondo effect, which manifests either as a peak or a dip line shape. The energy changes of these spin-reorientations are remarkably low and less than one millielectronvolt. The large tunable anisotropic magnetoresistance could be used to control electronic transport in molecular spintronics.

References in corpus (10)

• Kondo Physics in a Single Electron Transistor
• A Tunable Kondo Effect in Quantum Dots
• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Magnetoresistance through a single molecule
• Quantum phase transition in a single-molecule quantum dot
• Control of the magnetism and magnetic anisotropy of a single-molecule magnet with an electric field
• Reversible Single Spin Control of Individual Magnetic Molecule by Hydrogen Atom Adsorption
• Gating a single-molecule transistor with individual atoms
• Gating the charge state of a single molecule by local electric fields
• Tunable magnetoresistance in an asymmetrically coupled single molecule junction

Cited by in corpus (4)

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• Topological quantum phase transition in individual Fe Atoms on MoS${}_2$/Au(111)
• Giant anisotropic magnetoresistance through a tilted molecular $\pi$-orbital
• Independent and coherent transitions between antiferromagnetic states of few-molecule systems