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Paramagnetism

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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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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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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 linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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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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Magneto-Ionic Switching of Superparamagnetism.

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Small (Weinheim an Der Bergstrasse, Germany)
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Summary

Researchers demonstrated reversible ON/OFF magnetic switching in nanoporous Palladium-Cobalt (Pd(Co)) at room temperature using electrochemical hydrogen sorption. This voltage-controlled magnetism offers potential for spintronic devices.

Keywords:
electrochemical dealloyingmagneto-ionic effectnanoporous metalssuperparamagnetism

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrochemistry

Background:

  • Electrochemical reactions offer a route to control magnetism using electric fields.
  • Nanoporous materials exhibit favorable kinetics for magnetic tuning.
  • Controlling magnetism at room temperature is crucial for device applications.

Purpose of the Study:

  • To demonstrate reversible switching of magnetism in nanoporous Palladium-Cobalt (Pd(Co)) at room temperature.
  • To investigate the underlying mechanisms of electrochemically controlled magnetism.
  • To explore potential applications in spintronic and microelectromagnetic devices.

Main Methods:

  • Electrochemical hydrogen sorption was used to trigger magnetic switching.
  • Magnetic characterization techniques were employed to analyze magnetic properties.
  • High-resolution scanning transmission electron microscopy (STEM) was used to study material structure.

Main Results:

  • Fully reversible ON and OFF switching of magnetism was achieved in nanoporous Pd(Co) at room temperature.
  • Co-rich nanoclusters with superparamagnetic behavior were identified within the Pd matrix.
  • A strong magneto-ionic effect, driven by the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction, was observed and enhanced by hydrogen sorption.

Conclusions:

  • Electrochemical hydrogen sorption provides a novel method for voltage control of magnetism in nanoporous materials.
  • The observed magneto-ionic effect in Pd(Co) opens new avenues for spintronic and microelectromagnetic device development.