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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...
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...
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
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.
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Dirac half-metal in a triangular ferrimagnet.

Hiroaki Ishizuka1, Yukitoshi Motome

  • 1Department of Applied Physics, University of Tokyo, Hongo, 7-3-1, Bunkyo, Tokyo 113-8656, Japan.

Physical Review Letters
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

Researchers propose a novel fully spin-polarized Dirac semimetal in frustrated magnets. This material exhibits unique Dirac cone dispersion and half-metallic properties, promising for spintronics applications like spin-current generation.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Frustrated itinerant magnets present complex magnetic orders.
  • Dirac semimetals exhibit unique electronic band structures with Dirac cones.
  • Half-metallic behavior is crucial for spintronics applications.

Purpose of the Study:

  • To propose and theoretically realize a fully spin-polarized Dirac semimetal.
  • To investigate the emergence of ferrimagnetic order and Dirac nodes in frustrated magnets.
  • To explore potential applications in spintronics.

Main Methods:

  • Theoretical proposal of a Dirac semimetal in frustrated itinerant magnets.
  • Analysis of itinerant electrons on a triangular lattice.
  • Variational calculations and Monte Carlo simulations.

Main Results:

  • Demonstration of Dirac cone dispersion and half-metallic behavior.
  • Identification of a three-sublattice ferrimagnetic order.
  • Spontaneous emergence of ferrimagnetic order and Dirac nodes in a Kondo lattice model.

Conclusions:

  • A fully spin-polarized Dirac semimetal can be realized in frustrated itinerant magnets.
  • The proposed material exhibits graphene-like Dirac nodes.
  • This offers a promising candidate for efficient spin-current generators in spintronics.