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Related Concept Videos

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Ferromagnetism

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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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Color in Coordination Complexes
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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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.
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Ferromagnetic Phase in Nonequilibrium Quantum Dots.

WenJie Hou1, YuanDong Wang1, JianHua Wei2

  • 1Department of Physics, Renmin University of China, Beijing, 100872, China.

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|December 24, 2017
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Summary
This summary is machine-generated.

A robust ferromagnetic phase emerges in double quantum dots, suppressing the antiferromagnetic phase. This discovery enables magnetic-field-free control of spin states via phase transitions.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Dot Physics
  • Spintronics

Background:

  • Understanding magnetic phases in quantum dot systems is crucial for spintronics.
  • The interplay between electron correlation and transport phenomena dictates magnetic ordering.

Purpose of the Study:

  • To investigate the emergence and characteristics of magnetic phases in series-coupled double quantum dots.
  • To explore the conditions favoring ferromagnetic (FM) over antiferromagnetic (AFM) phases.
  • To identify mechanisms for magnetic-field-free control of spin states.

Main Methods:

  • Nonperturbative solution of the nonequilibrium Anderson two-impurity model.
  • Application of the hierarchical equations of motion approach.
  • Analysis of phase diagrams under varying bias and detuning energies.

Main Results:

  • A robust ferromagnetic (FM) phase is identified in series-coupled double quantum dots, dominating at finite bias and detuning in the strongly correlated limit.
  • The FM phase arises from passive parallel spin alignment due to the Pauli exclusion principle during electron transport.
  • Nonequilibrium Kondo effects manifest in magnetic susceptibility, spectral functions, and current at low temperatures within the FM phase.
  • The antiferromagnetic (AFM) phase remains stable in the weakly correlated limit.

Conclusions:

  • The study reveals a robust FM phase in double quantum dots, capable of suppressing the AFM phase.
  • The findings suggest a pathway for magnetic-field-free internal control of spin states through a continuous FM-AFM phase transition.