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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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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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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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...
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Tunable magnetization steps in mixed valent ferromagnet Eu2CoMnO6.

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Researchers controlled magnetic properties in Eu2CoMnO6 double-perovskite crystals by annealing. Oxygen annealing delayed magnetization steps, while Argon annealing caused bifurcation, enhancing magnetic functionalities.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Magnetism

Background:

  • Magnetic properties are crucial for advanced functionalities.
  • Tuning material processing parameters offers a route to control magnetism.
  • Double-perovskite oxides are promising for magnetic applications.

Purpose of the Study:

  • To investigate the controllable magnetization steps in Eu2CoMnO6 double-perovskite single crystals.
  • To explore the impact of annealing environments on the magnetic state.
  • To demonstrate an efficient approach for enhancing magnetic properties.

Main Methods:

  • Synthesis of Eu2CoMnO6 single crystals.
  • Characterization of magnetic properties, including hysteresis loops and magnetization steps.
  • Annealing experiments in different gas environments (O2 and Ar).
  • Analysis of the effects of annealing on the mixed magnetic state.

Main Results:

  • Ferromagnetic order was observed below TC ≈ 122 K along the c-axis.
  • The inherent difficulty in altering Co2+ and Mn4+ oxidation states leads to antiferromagnetic clusters.
  • Oxygen annealing retarded magnetization steps.
  • Argon annealing resulted in the bifurcation of magnetization steps.
  • Annealing significantly modified the mixed magnetic state.

Conclusions:

  • The study demonstrates controllable magnetization steps in Eu2CoMnO6 through post-synthesis annealing.
  • Annealing in O2 and Ar atmospheres provides distinct modifications to the magnetic hysteresis.
  • This method offers an efficient strategy for tuning the magnetic properties of double-perovskite oxides for specific applications.