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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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...
Diamagnetism01:26

Diamagnetism

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.
Ferromagnetism01:31

Ferromagnetism

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...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

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Updated: Jul 15, 2026

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
08:25

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

Multidirectional Spin-Orbit Torque Magnetization Dynamics in beyond Room Temperature Van der Waals Magnet Devices.

Bing Zhao1, Lakhan Bainsla1,2, Soheil Ershadrad3,4

  • 1Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden.

Nano Letters
|July 14, 2026
PubMed
Summary

Room-temperature van der Waals (vdW) magnets like CFGT enable energy-efficient spintronics. This study reveals efficient multidirectional torques in CFGT/Pt heterostructures, paving the way for advanced memory technologies.

Keywords:
2D materialsST-FMRmagnetization dynamicsroom temperaturesecond harmonic Hallspin−orbit torque (SOT)vdW magnets

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Published on: March 24, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Room-temperature van der Waals (vdW) magnets are crucial for energy-efficient spintronic devices.
  • Understanding magnetization dynamics in these materials is vital for high-speed memory applications.
  • Exploration of spin-orbit torque phenomena in vdW magnets is limited.

Purpose of the Study:

  • Investigate spin-orbit torque phenomena in the (Co0.15Fe0.85)5GeTe2 (CFGT)/Pt heterostructure.
  • Characterize the in-plane and out-of-plane spin Hall conductivity.
  • Elucidate the origin of unconventional damping-like torques.

Main Methods:

  • Spin-torque ferromagnetic resonance (ST-FMR).
  • Second-harmonic Hall measurements.
  • Density functional theory (DFT) and Monte Carlo simulations.

Main Results:

  • Identified a conventional in-plane spin Hall conductivity of 3.68 × 10^5 (ℏ/2e) (Ω m)^-1.
  • Discovered a significant out-of-plane spin Hall conductivity of -0.33 × 10^5 (ℏ/2e) (Ω m)^-1.
  • Attributed unconventional torques to interface-induced spin reorientation and enhanced Dzyaloshinskii-Moriya interaction.

Conclusions:

  • vdW magnets exhibit efficient multidirectional torques, crucial for spintronic applications.
  • The CFGT/Pt heterostructure shows potential for next-generation spintronic devices.
  • Low effective magnetization and moderate damping enhance torque efficiency.