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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.8K
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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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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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...
8.9K
Diamagnetism01:26

Diamagnetism

2.8K
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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Fermi Level01:18

Fermi Level

2.5K
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
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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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Induced ferromagnetism at BiFeO3/YBa2Cu3O7 interfaces.

Jian-Xin Zhu1, Xiao-Dong Wen2, J T Haraldsen3

  • 11] Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA [2] Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Scientific Reports
|June 21, 2014
PubMed
Summary
This summary is machine-generated.

We discovered metallic ferromagnetism at BiFeO3/YBa2Cu3O7 interfaces using first-principles calculations. This interfacial magnetism, confirmed by hysteresis loops, could impact electronic and transport properties.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state chemistry

Background:

  • Transition metal oxides (TMOs) display diverse emergent phenomena like superconductivity and magnetism.
  • Interfacing TMOs can create novel functionalities not present in individual materials.

Purpose of the Study:

  • Investigate magnetism at BiFeO3/YBa2Cu3O7 interfaces.
  • Understand the origin and implications of interfacial magnetic phenomena.

Main Methods:

  • First-principles calculations to determine magnetic spin configurations and total energies.
  • Development of an interface exchange-coupling model.
  • Analysis of field-dependent magnetization data for hysteresis loops.

Main Results:

  • Metallic ferromagnetism is induced at the BiFeO3/YBa2Cu3O7 interface.
  • First-principles calculations reveal specific exchange coupling strengths.
  • Experimental data confirms interfacial ferromagnetism via observed hysteresis.

Conclusions:

  • The interface between BiFeO3 and YBa2Cu3O7 exhibits induced ferromagnetism.
  • Interfacial magnetism has significant implications for electronic and transport properties.
  • This finding opens avenues for novel TMO-based heterostructure design.