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Ferromagnetism

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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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Updated: Sep 2, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Two-Dimensional Organic-Inorganic Room-Temperature Multiferroics.

Yali Yang^1,2, Junyi Ji^1,2, Junsheng Feng³

¹Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences, and Department of Physics, Fudan University, Shanghai 200433, China.

Journal of the American Chemical Society

|August 4, 2022

Summary

This summary is machine-generated.

Researchers designed a room-temperature multiferroic material by understanding magnetic coupling in 2D organic-inorganic systems. This breakthrough enables the development of next-generation electronic devices.

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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

Area of Science:

Materials Science
Condensed Matter Physics
Solid State Chemistry

Background:

Organic-inorganic multiferroics are key for advanced electronics.
Existing materials often have low magnetic Curie temperatures, limiting practical applications.

Purpose of the Study:

To elucidate the mechanism of magnetic coupling in 2D organic-inorganic materials.
To design a room-temperature multiferroic material.

Main Methods:

First-principles calculations.
Effective model Hamiltonians.
Analysis of molecular orbital-mediated magnetic coupling.

Main Results:

Identified molecular orbital-mediated magnetic coupling in 2D Cr(pyz)2.
Determined the influence of molecular valence state on magnetic coupling.
Designed a room-temperature multiferroic, Cr(h-fpyz)2, by inducing ferroelectricity.

Conclusions:

Revealed the fundamental origin of magnetic coupling in 2D organic-inorganic systems.
Provided a rational design strategy for room-temperature multiferroic materials.
Paved the way for next-generation electronic devices.