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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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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Chiral Phonons Enhance Ferromagnetism.

Jonas Fransson¹, Yael Kapon², Lilach Brann²

¹Department of Physics and Astronomy, Uppsala University, Box 516, 751 21 Uppsala, Sweden.

The Journal of Physical Chemistry Letters

|February 18, 2025

Summary

Chiral molecules enhance ferromagnetic order in magnetite by increasing coercivity and magnetic anisotropy. This phenomenon, driven by phonon-magnon coupling, stabilizes magnetic properties at room temperature.

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Area of Science:

Condensed Matter Physics
Materials Science
Surface Science

Background:

Ferromagnetic materials like magnetite can have their properties altered by adsorbed molecules.
Chiral molecules are known to interact uniquely with surfaces due to their asymmetry.

Purpose of the Study:

To investigate the effect of chiral molecule adsorption on the ferromagnetic properties of magnetite.
To propose a mechanism explaining the observed changes in magnetic anisotropy and coercivity.

Main Methods:

Experimental measurements of magnetic coercivity in magnetite films with adsorbed chiral molecules.
Analysis of temperature-dependent magnetic properties.
Theoretical modeling of phonon-magnon coupling to explain the observed phenomena.

Main Results:

Adsorption of chiral molecules significantly increased the coercivity of ferromagnetic magnetite, reaching 20 times Earth's magnetic flux density at room temperature.
Coercivity showed a linear increase with temperature in a specific range around room temperature.
A mechanism involving the coupling of nuclear vibrations (phonons) and ferromagnetic spin excitations (magnons) was proposed to explain the enhanced magnetic anisotropy.

Conclusions:

Chiral molecule adsorption can effectively enhance the ferromagnetic order and stability of materials like magnetite.
Phonon-magnon coupling, enabled by chirality, plays a crucial role in diverting thermal energy and increasing magnetic anisotropy.
This study offers a pathway for designing materials with enhanced magnetic properties for technological applications.