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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...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

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Related Experiment Video

Updated: Jun 3, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Spin waves in the (π,0) magnetically ordered iron chalcogenide Fe1.05Te.

O J Lipscombe1, G F Chen, Chen Fang

  • 1The University of Tennessee, Knoxville, Tennessee 37996-1200, USA.

Physical Review Letters
|March 17, 2011
PubMed
Summary

Spin waves in iron chalcogenide superconductors show unique behavior. Similar next-nearest-neighbor couplings suggest a shared magnetic origin for superconductivity in iron pnictides and chalcogenides.

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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

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Last Updated: Jun 3, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

Area of Science:

  • Condensed matter physics
  • Materials science
  • Magnetism

Background:

  • Iron chalcogenides and pnictides are important classes of superconductors.
  • Understanding the magnetic interactions is key to explaining their superconducting properties.

Purpose of the Study:

  • To investigate the spin wave dispersion in the iron chalcogenide Fe(1.05)Te.
  • To compare these findings with theoretical calculations and related materials.
  • To elucidate the magnetic origin of superconductivity in these materials.

Main Methods:

  • Neutron scattering experiments were performed on Fe(1.05)Te.
  • Spin wave dispersion was measured and analyzed.
  • A Heisenberg Hamiltonian was fitted to the experimental data.

Main Results:

  • Novel spin wave dispersion was observed in Fe(1.05)Te, differing from theoretical predictions and CaFe(2)As(2).
  • Nearest-neighbor exchange couplings were found to be different between Fe(1.05)Te and CaFe(2)As(2).
  • Next-nearest-neighbor (NNN) couplings were found to be similar in both systems.

Conclusions:

  • The NNN magnetic coupling plays a crucial role in the superconductivity of both iron pnictides and chalcogenides.
  • Superconductivity in these materials likely shares a common magnetic origin.
  • Further research into NNN coupling can guide the development of new superconductors.