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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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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...
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Color in Coordination Complexes
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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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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Updated: Sep 18, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Light-Induced Spin Slanting in 2D Multiferroic Magnet.

Jiangyu Zhao1, Yangyang Feng1, Kaiying Dou1

  • 1School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Shandanan Street 27, Jinan 250100, China.

ACS Nano
|June 26, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to control spin orientation in 2D multiferroic materials using ultrafast light pulses. This technique enables light-induced spin slanting, opening new avenues for condensed-matter physics research.

Keywords:
TDDFTfirst-principleslight-induced magnetization dynamicsspin slantingtwo-dimensional materials

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Area of Science:

  • Condensed-matter physics
  • Materials science
  • Spintronics

Background:

  • Controlling spin orientation in 2D materials is crucial for discovering new phases of matter.
  • Current methods are limited to specific in-plane and out-of-plane directions, hindering novel physics exploration.

Purpose of the Study:

  • To introduce a novel methodology for manipulating spin slanting in 2D multiferroic materials.
  • To enable light-induced control over spin orientation beyond fixed directions.

Main Methods:

  • Utilized ultrafast light pulses to trigger spin-orbit coupling-induced interactions.
  • Employed model analysis and real-time time-dependent density-functional theory (TDDFT).
  • Investigated 2D multiferroic materials with specific low-energy compositions and symmetry properties.

Main Results:

  • Demonstrated that simultaneous triggering of in-plane and out-of-plane orbital interactions generates spin slanting.
  • Achieved light-induced spin slanting in single-layer CuCr2Se4.
  • Validated the efficiency of ultrafast light illumination for this manipulation.

Conclusions:

  • The study presents an efficient method for manipulating spin orientation in 2D materials.
  • Establishes a general platform for exploring the physics and applications of spin slanting.
  • Highlights the potential of light-control for advanced spintronic devices.