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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Ferromagnetism01:31

Ferromagnetism

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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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Schottky Barriers
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MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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Related Experiment Video

Updated: May 18, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Spin-flop switching and memory in a molecular conductor.

Mitsuhiko Maesato1, Tomohito Kawashima, Yoshitomo Furushima

  • 1Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan. maesato@kuchem.kyoto-u.ac.jp

Journal of the American Chemical Society
|October 9, 2012
PubMed
Summary

We observed significant positive magnetoresistance and nonvolatile memory in a novel molecular conductor. This arises from the interaction between π electrons and d-electron spins, paving the way for molecular spintronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Molecular Electronics

Background:

  • Molecular conductors offer tunable electronic properties.
  • The interplay between different electron systems (π and d) is key to novel phenomena.
  • Antiferromagnetic ordering and spin density waves are important electronic states.

Purpose of the Study:

  • To investigate magnetotransport properties of π-d hybrid molecular conductors.
  • To explore the origin of observed magnetoresistance and memory effects.
  • To demonstrate the potential of molecular systems in spintronics.

Main Methods:

  • Synthesis of the π-d hybrid molecular conductor (DIETSe)2FeCl4.
  • Electrical transport measurements under varying magnetic fields.
  • Analysis of magnetotransport phenomena related to spin ordering.

Main Results:

  • First observation of spin-flop-induced positive magnetoresistance up to 100%.
  • Demonstration of nonvolatile magnetoresistive memory effect.
  • Evidence for coexistence of spin density wave (SDW) and antiferromagnetic d-electron order.

Conclusions:

  • The observed phenomena stem from the interplay between Q1D π-electron instability and d-electron antiferromagnetism.
  • This discovery opens new avenues for molecular spintronics and memory devices.
  • The (DIETSe)2FeCl4 system serves as a model for studying coupled electronic and magnetic orders.