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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...
Paramagnetism01:30

Paramagnetism

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...
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.
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...
Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...

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Related Experiment Video

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
10:36

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Published on: January 21, 2016

Room-temperature magnetic ordering in functionalized graphene.

Jeongmin Hong1, Elena Bekyarova, Ping Liang

  • 1Department of Electrical and Computer Engineering, Florida International University, Miami, Florida 33174, USA.

Scientific Reports
|September 7, 2012
PubMed
Summary
This summary is machine-generated.

Functionalizing graphene nanostructures with aryl radicals enables room-temperature magnetic order, resolving a key challenge for spintronic applications. This discovery opens new avenues for advanced electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Room-temperature magnetic order in graphene is crucial for spintronics but remains unresolved.
  • Pristine graphene lacks intrinsic magnetic properties, hindering its spintronic potential.

Purpose of the Study:

  • To investigate the possibility of achieving room-temperature magnetic order in graphene nanostructures.
  • To explore the effects of aryl radical functionalization on graphene's magnetic properties.

Main Methods:

  • Scanning tunneling microscopy (STM) for imaging nanostructure morphology and magnetic ordering.
  • Point current-voltage (I-V) measurements to probe local electronic and magnetic states.
  • Application of external magnetic fields to study field-dependent magnetic behavior.

Main Results:

  • Aryl radical functionalization induces 1-D and 2-D periodic super-lattices in graphene nanostructures.
  • Evidence of local magnetic moments with parallel and anti-parallel ordering observed in nanoribbons and 2-D segments.
  • Spin-polarized local density of states (LDOS) and magnetic anisotropy fields (out-of-plane <10 Oe, exchange coupling ~100 Oe) confirmed at room temperature.

Conclusions:

  • Aryl radical functionalization is a viable strategy to engineer room-temperature magnetic order in graphene.
  • Graphene nanostructures with controlled functionalization exhibit promising properties for spintronic applications.