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Ferromagnetism

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...

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...

Phase Diagrams of Ternary Systems

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...

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Related Experiment Video

Updated: Mar 27, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Two-Dimensional Triferroics: From Fundamental Couplings to Multifunctional Applications.

Yang Li^1,2, Jialin Gong³, Zhiqing Li²

¹Chongqing Higher Education Intelligent Display and Perception Technology Engineering Research Center, Chongqing Youth Vocational & Technical College, Chongqing, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|March 26, 2026

Summary

Triferroic materials, with three coupled ferroic orders, offer advanced multistate control. This review explores emerging 2D triferroic materials, their properties, and potential applications in next-generation electronics.

Keywords:

ferroelasticity ferroelectricity ferrovalley magnetism triferroics

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Last Updated: Mar 27, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Area of Science:

Materials Science
Condensed Matter Physics

Background:

Triferroic compounds exhibit coexistence and coupling of more than two ferroic orders, presenting a novel class of multiferroic materials.
The involvement of a third ferroic order allows for complex, tunable functional responses and deterministic multistate control, surpassing conventional pairwise coupling in multiferroics.

Purpose of the Study:

To provide a comprehensive overview of recent advancements in two-dimensional (2D) triferroic materials.
To focus on the origin and interplay of multiple ferroic orders at structural and electronic levels within these 2D systems.

Main Methods:

Review of existing literature on 2D triferroic materials.
Analysis of structural and electronic mechanisms governing ferroic order interplay.

Main Results:

Triferroicity, previously limited to 3D systems, is now being explored in 2D materials, offering advantages like high storage density and flexibility.
Understanding the interplay of ferroic orders is key to unlocking novel functionalities.

Conclusions:

2D triferroic materials hold significant promise for applications in multistate data storage and spintronic devices.
Future research should focus on exploring new 2D triferroic systems and optimizing their properties for technological applications.