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Related Concept Videos

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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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Atomic Nuclei: Nuclear Spin State Overview01:03

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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...
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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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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Force On A Current Loop In A Magnetic Field01:17

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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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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Related Experiment Video

Updated: Dec 18, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Anomalous Spin Behavior in Fe3GeTe2 Driven by Current Pulses.

Ke Pei1, Shanshan Liu2,3, Enze Zhang2,3

  • 1Laboratory of Advanced Materials, Department of Materials Science, Collaborative Innovation Center of Chemistry for Energy Materials(iChEM), Fudan University, Shanghai 200433, China.

ACS Nano
|June 16, 2020
PubMed
Summary

High-density currents can rearrange spin textures in 2D ferromagnetic materials like Fe3GeTe2. This study reveals how current pulses modulate domain wall density, enabling new device fabrication possibilities.

Keywords:
2D ferromagnetic materialsanomalous spin behaviorcurrent-inducedin situ experimentsmagnetic domain structure

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • 2D ferromagnetic materials are promising for spintronics and topological devices.
  • Challenges in spin arrangement and current-driven dynamics hinder practical applications.
  • Understanding spin texture evolution under high-density currents is crucial for device fabrication.

Purpose of the Study:

  • To investigate current-pulse-driven spin textures in 2D ferromagnetic material Fe3GeTe2.
  • To explore the modulation of domain wall density and structure.
  • To provide insights into domain structure transitions for device applications.

Main Methods:

  • In situ Lorentz transmission electron microscopy (TEM).
  • Application of high-density current pulses.
  • Synchronous application of current pulses and magnetic fields.

Main Results:

  • High-density currents can break and rearrange stripe domain structures in Fe3GeTe2.
  • Domain wall density modulation is achievable, enabling high-density domain structures.
  • Bubble domain structures and random magnetization were obtained using synchronous current pulses and magnetic fields.

Conclusions:

  • Current-driven domain structure transitions are demonstrated in 2D metallic ferromagnetic materials.
  • Weak interlayer exchange interaction and strong current disturbance contribute to observed phenomena.
  • Findings offer a pathway for fabricating advanced spintronic and topological devices.