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Related Concept Videos

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...

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Related Experiment Video

Updated: May 31, 2026

Fabricating Nanogaps by Nanoskiving
07:36

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Published on: May 13, 2013

Gapped ferromagnetic graphene nanoribbons.

Dong Hou1, Jianhua Wei, Shijie Xie

  • 1School of Physics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.

Physical Chemistry Chemical Physics : PCCP
|June 28, 2011
PubMed
Summary
This summary is machine-generated.

Researchers designed a novel graphene-based ferromagnetic semiconductor using organic magnets. This material exhibits a large spin-split gap, showing potential for spintronic devices like spin transistors.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Organic Electronics

Background:

  • Graphene nanoribbons (GNRs) are promising materials for electronics.
  • Achieving stable ferromagnetism in organic semiconductors is challenging.
  • Controlling spin properties in GNRs is crucial for spintronics.

Purpose of the Study:

  • To theoretically design a graphene-based all-organic ferromagnetic semiconductor.
  • To investigate the potential applications in spin transistors.
  • To understand the underlying mechanisms for ferromagnetism in this system.

Main Methods:

  • Theoretical design of zigzag graphene nanoribbons (ZGNRs) terminated with organic magnets.
  • First-principles calculations incorporating electron, spin, and lattice interactions.
  • Analysis of non-collinear spin orientations and density of states.

Main Results:

  • A large spin-split gap was obtained in the designed material.
  • 100% spin-polarized density of states near the Fermi energy was achieved.
  • Antiferromagnetic π-π exchange and strong electron-lattice interactions induce ferromagnetism.

Conclusions:

  • The proposed graphene-organic magnet system is a viable candidate for ferromagnetic semiconductors.
  • The material shows potential for applications in advanced spintronic devices.
  • Ferromagnetism arises from a combination of π-π exchange and electron-lattice coupling, despite the absence of d electrons.