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Related Concept Videos

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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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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Paramagnetism01:30

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...
3.1K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.5K
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.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
2.5K
Magnetic Force01:18

Magnetic Force

2.1K
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Two-Dimensional Magnetic Semiconductor in Feroxyhyte.

Imran Khan1, Arqum Hashmi2, M Umar Farooq1

  • 1Department of Physics, Pukyong National University , Busan 608-737, Korea.

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|September 21, 2017
PubMed
Summary
This summary is machine-generated.

Researchers investigated the crystal structure and properties of two-dimensional (2D) feroxyhyte (δ-FeOOH). The trilayer structure shows magnetic and optical properties aligning with experimental findings, suggesting its suitability for spintronics.

Keywords:
2D materialferoxyhyteferrimagnetismmagnetic semiconductoroptical properties

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Two-dimensional (2D) feroxyhyte (δ-FeOOH) has been proposed for spintronics due to its band gap and potential magnetic moment.
  • The precise crystal structure of 2D δ-FeOOH remains undetermined, hindering further application development.

Purpose of the Study:

  • To elucidate the crystal structure, electronic band structure, and magnetic/optical properties of 2D δ-FeOOH.
  • To identify the specific layered structure of experimentally synthesized δ-FeOOH.

Main Methods:

  • Density functional theory (DFT) calculations were employed to investigate structural, electronic, magnetic, and optical properties.
  • Dynamical stability calculations and comparison with experimental observations were used to validate proposed structures.

Main Results:

  • Monolayer δ-FeOOH exhibits an antiferromagnetic ground state with a 2.4 eV indirect band gap.
  • Bilayer δ-FeOOH shows a ferrimagnetic state with a 0.87 eV direct band gap and a net magnetic moment of 1.49 μB/cell.
  • Trilayer δ-FeOOH, with a thickness of 11.57 Å, presents a 1.6 eV band gap and optical absorption onset at 2.2 eV, consistent with experimental data.

Conclusions:

  • The study proposes that 2D δ-FeOOH originates from bulk Fe(OH)2 oxidation.
  • The trilayer structure of δ-FeOOH is identified as the most probable candidate matching experimental synthesis parameters, including thickness and optical absorption.
  • The findings support the potential of trilayer δ-FeOOH for spintronics applications.