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Related Concept Videos

Diamagnetism01:26

Diamagnetism

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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.
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....
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Ferromagnetism01:31

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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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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Paramagnetism01:30

Paramagnetism

2.9K
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...
2.9K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

908
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.
908
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

649
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Giant Magnetoresistance in Boundary-Driven Spin Chains.

Kasper Poulsen1, Nikolaj T Zinner2

  • 1Department of Physics and Astronomy, Aarhus University, Ny munkegade 120, 8000 Aarhus C, Denmark.

Physical Review Letters
|March 5, 2021
PubMed
Summary

Giant magnetoresistance (GMR) is demonstrated in spin chains with weakly interacting layers. This effect, driven by energy spectrum mismatches, is controllable with magnetic fields for novel electronic applications.

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Area of Science:

  • Solid State Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Giant magnetoresistance (GMR) is a phenomenon where electrical resistance significantly changes in response to an external magnetic field.
  • GMR is typically observed in multilayer structures with alternating ferromagnetic and non-magnetic layers.
  • Understanding GMR in novel spin systems is crucial for developing advanced spintronic devices.

Purpose of the Study:

  • To investigate the possibility of giant magnetoresistance in a spin chain system.
  • To elucidate the underlying mechanism responsible for GMR in this specific spin chain architecture.
  • To establish a predictive rule for spin transport behavior under magnetic fields in such systems.

Main Methods:

  • Theoretical modeling of a spin chain composed of weakly interacting layers of strongly coupled spins.
  • Analysis of the system's energy spectrum and spin excitation behavior.
  • Simulation of spin transport across layer boundaries and its dependence on magnetic fields.

Main Results:

  • Giant magnetoresistance was observed in the spin chain system across all simulated sizes, including a minimal system of four spins.
  • The GMR effect arises from a mismatch in the energy spectrum, causing spin excitations to reflect at layer boundaries.
  • External magnetic fields were shown to effectively control this energy mismatch and, consequently, the spin current.

Conclusions:

  • Giant magnetoresistance is achievable in a spin chain architecture with weakly interacting layers of strongly coupled spins.
  • The observed GMR is attributed to magnetic-field-controlled reflection of spin excitations due to energy spectrum mismatches.
  • A simple rule based on energy levels can predict spin transport behavior in these systems, offering potential for spintronic applications.