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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...

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...

Magnetic Susceptibility and Permeability

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

Magnetism

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Potential Due to a Magnetized Object

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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Diamagnetism

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.
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Related Experiment Video

Updated: Jun 12, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

High-Entropy Materials for Application: Electricity, Magnetism, and Optics.

Xuan Gu^1,2, Xiao-Bin Guo^1,2, Wen-Hua Li^1,2

¹School of Physics & Optoelectric Engineering, Guangdong University of Technology, Guangzhou, 510006, China.

ACS Applied Materials & Interfaces

|September 26, 2024

Summary

High-entropy materials (HEMs), composed of multiple elements, exhibit unique properties due to high-entropy effects. This review covers their electrical, magnetic, and optical characteristics, applications, and development prospects.

Keywords:

High-entropy materials functional properties potential applications synthesis methods theoretical design

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Last Updated: Jun 12, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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Area of Science:

Materials Science
Solid State Physics
Chemistry

Background:

High-entropy materials (HEMs) are a class of advanced materials characterized by complex compositions.
They typically consist of five or more principal elements in near-equiatomic ratios.
These materials exhibit unique properties stemming from high-entropy effects, lattice distortions, slow diffusion, and cocktail effects.

Purpose of the Study:

To review the electrical, magnetic, and optical properties of high-entropy materials.
To explore the potential applications of HEMs across various fields.
To discuss theoretical calculation methods and preparation techniques for HEMs.

Main Methods:

Literature review of existing research on HEMs.
Analysis of theoretical calculation approaches.
Compilation of preparation techniques for HEMs.

Main Results:

HEMs demonstrate exceptional electrical, magnetic, and optical properties.
Significant potential applications identified in diverse technological areas.
Established theoretical and experimental methodologies for HEM development.

Conclusions:

High-entropy materials offer a promising avenue for novel material design.
Further research into their properties and applications is warranted.
Advancements in theoretical and preparation methods will drive future development of HEMs.