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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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Biasing of Metal-Semiconductor Junctions01:27

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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Metal-Semiconductor Junctions01:24

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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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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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Gate engineering Fabry-Pérot resonance in altermagnetic junctions.

Qianqian Lv1, Yong Xu2, Jun-Feng Liu3

  • 1School of Humanities and Basic Sciences, Shenzhen University of Information Technology, Shenzhen, 518172, China.

Scientific Reports
|November 27, 2025
PubMed
Summary

Altermagnets enable electrical control of spin-polarized transport without magnetic fields. This study shows gate-controlled spin filtering in d-wave altermagnetic junctions, offering a new spintronic mechanism.

Keywords:
AltermagnetismFabry-Pérot resonanceGate controlSpin filtering

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Spintronics aims to control spin-polarized currents electrically.
  • Altermagnets offer a novel platform for spintronics due to their unique magnetic and symmetry properties.
  • They provide spin splitting without net magnetization, magnetic fields, or spin-orbit coupling.

Purpose of the Study:

  • Investigate coherent spin transport in two-dimensional d-wave altermagnetic junctions.
  • Explore the potential for electrically tunable spin filtering.
  • Distinguish between different d-wave altermagnetic symmetries.

Main Methods:

  • Quantum scattering formalism applied to a d-wave altermagnetic junction connected to normal metal leads.
  • Analysis of anisotropic exchange fields and spin-dependent effective masses.
  • Modeling of Fabry-Pérot resonances for spin-up and spin-down electrons.

Main Results:

  • Spin-polarized transport achieved when junction length matches spin-dependent wavelengths.
  • Spin polarization is controllable via gate potential, interfacial barrier strength, and altermagnetic field orientation.
  • The [Formula: see text]-wave altermagnet exhibits robust gate-controlled spin-polarized current in the tunneling regime, unlike the [Formula: see text]-wave counterpart.

Conclusions:

  • Demonstrated a field-free, gate-controlled mechanism for spintronic functionality.
  • Established tunable spin filtering based on crystalline anisotropy in altermagnets.
  • Provided a diagnostic tool to differentiate d-wave altermagnetic symmetries.