Related Experiment Video
Updated: Aug 19, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.2K
High-Angular Momentum Excitations in Collinear Antiferromagnet FePS3.
Jan Wyzula1,2, Ivan Mohelský1, Diana Václavková1
1Laboratoire National des Champs Magnétiques Intenses, CNRS UPR3228, EMFL, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T, Grenoble and Toulouse, F-38042, France.
Nano Letters
|December 2, 2022
Summary
Researchers studied the magnetic properties of FePS3, discovering a unique multipolar magnon. This excitation, a 4-magnon bound state, could lead to exotic magnetic states in materials with high magnetic anisotropy.
Area of Science:
- Condensed matter physics
- Magnetism
- Materials science
Background:
- FePS3 is a quasi-two-dimensional van der Waals antiferromagnet.
- Antiferromagnetic resonance modes are typical in easy-axis antiferromagnets.
Purpose of the Study:
- Investigate magneto-optical properties of FePS3.
- Characterize unusual magnetic excitations in FePS3.
- Explore potential exotic magnetic states.
Main Methods:
- Magneto-optical studies.
- Analysis of magnetic excitations and Zeeman splitting.
Main Results:
- Observed an excitation resembling antiferromagnetic resonance.
- This excitation exhibited a four-times larger Zeeman splitting than expected.
- Identified the excitation as a single-ion |S|=4 multipolar magnon (4-magnon bound state).
- The multipolar magnon corresponds to a full magnetic moment reversal of Fe2+ ions.
Conclusions:
- Multipolar magnons are a novel type of magnetic excitation.
- Condensation of multipolar magnons may create exotic states in large-spin, anisotropic materials.
- FePS3 serves as a model system for studying multipolar magnons.
Related Concept Videos
01:23Atomic Nuclei: Nuclear Relaxation Processes
701
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.
701
01:27π Electron Effects on Chemical Shift: Overview
1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K
01:31Ferromagnetism
2.4K
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...
2.4K
01:03Atomic Nuclei: Nuclear Spin State Overview
1.1K
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...
1.1K
00:59Atomic Nuclei: Nuclear Magnetic Moment
1.3K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
1.3K
02:42Valence Bond Theory
9.0K
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...
9.0K