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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Magnetostatic Boundary Conditions01:28

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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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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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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.
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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.
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Magnetic Declination01:19

Magnetic Declination

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Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
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Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Competing Magnetic States in the Possible Altermagnet Candidate GdAlGe.

Oleg E Parfenov1, Dmitry V Averyanov1, Ivan S Sokolov1

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Researchers explored altermagnetism in GdAlGe films, finding that reduced dimensionality enhances ferromagnetic properties. This interplay creates intrinsic exchange bias, crucial for nanoscale spintronic devices.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Altermagnetism offers unique properties by combining zero net magnetization with spin-polarized electronic bands.
  • The interplay of altermagnetism and weak ferromagnetism is promising for advanced spintronic applications.
  • The influence of dimensionality on coexisting altermagnetic and ferromagnetic states remains underexplored.

Purpose of the Study:

  • To investigate the magnetic and electron transport properties of epitaxial GdAlGe films across various dimensions, from bulk to monolayer.
  • To understand how dimensionality affects the coexistence of altermagnetic and ferromagnetic states in GdAlGe.
  • To explore the potential for intrinsic exchange bias in nanoscale altermagnets.

Main Methods:

  • Epitaxial growth of GdAlGe films with varying thicknesses.
  • Characterization of magnetic properties.
  • Measurement of electron transport, including anomalous Hall effect and magnetoresistance.

Main Results:

  • GdAlGe films exhibit both the anomalous Hall effect and negative magnetoresistance.
  • Unlike GdAlSi, GdAlGe shows an increasing ferromagnetic admixture as dimensionality decreases towards the 2D limit.
  • The coexistence of altermagnetic and ferromagnetic states results in intrinsic exchange bias.

Conclusions:

  • Dimensionality plays a critical role in tuning the magnetic properties of GdAlGe, enhancing ferromagnetic contributions at reduced dimensions.
  • The observed intrinsic exchange bias in GdAlGe films is a significant finding for spintronic applications.
  • This study provides a foundation for future research and applications of nanoscale altermagnets.