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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Large Magnetoresistance in Single-Radical Molecular Junctions.

Ryoma Hayakawa1, Mohammad Amin Karimi, Jannic Wolf

  • 1International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science , 1-1 Namiki, Tsukuba 305-0044, Japan.

Nano Letters
|July 27, 2016
PubMed
Summary

Organic radicals in molecular junctions exhibit significant positive magnetoresistance, a phenomenon linked to magnetic field-induced loss of charge carrier coherence. This finding offers a new way to control electron transport in single-molecule devices.

Keywords:
Single organic radicalscharge transportlarge magnetoresistancemechanically controllable break junction

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Area of Science:

  • Molecular spintronics
  • Organic electronics
  • Quantum transport

Background:

  • Organic radicals are key components for molecular spintronics.
  • The role of unpaired electrons in single-molecule electron transport remains largely unexplored.
  • Understanding electron transport in radical molecular junctions is crucial for spintronic applications.

Purpose of the Study:

  • To investigate the effect of magnetic fields on electron transport in single oligo(p-phenyleneethynylene) (OPE)-based radical molecular junctions.
  • To quantify the magnetoresistance (MR) of these radical systems.
  • To elucidate the underlying mechanisms responsible for the observed magnetoresistance.

Main Methods:

  • Fabrication of single-molecule junctions using a mechanically controllable break-junction technique at low temperatures (4.2 K).
  • Measurement of current-voltage characteristics and inelastic electron tunneling spectroscopy (IETS).
  • Analysis of magnetoresistance (MR) under applied magnetic fields up to 4 T.

Main Results:

  • Observation of unusually large positive magnetoresistances (MRs) ranging from 16% to 287% in radical molecular junctions, significantly exceeding those of pristine OPEs (2-4%).
  • Evidence of reduced electronic coupling between molecular orbitals and electrodes with increasing magnetic field, derived from MR and IETS data.
  • Correlation between magnetic field strength and the magnitude of magnetoresistance.

Conclusions:

  • The substantial MR in single-radical molecular junctions is potentially attributed to magnetic field-induced loss of phase coherence in charge carriers.
  • Findings suggest a novel approach for tuning charge transport in metal-molecule junctions by incorporating organic radicals.
  • Further research is needed to fully understand the mechanism behind the observed strong magnetoresistance phenomenon.