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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Organic Multiferroic Magnetoelastic Complexes.

Mengmeng Wei¹, Kepeng Song², Yuying Yang¹

¹School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China.

Advanced Materials (Deerfield Beach, Fla.)

|September 3, 2020

Summary

This summary is machine-generated.

Optimizing organic crystal structures, like coronene-tetracyanoquinodimethane (TCNQ), creates spontaneous spin polarization and ferromagnetism. This work reveals magnetoelastic coupling in organic ferromagnets, enabling mechanical control of spin polarization.

Keywords:

organic ferromagnetism organic magnetoelastic coupling spin-lattice interaction

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Area of Science:

Materials Science
Condensed Matter Physics
Organic Electronics

Background:

Crystal structure design is crucial for discovering novel physical phenomena in organic materials.
Organic ferromagnets offer potential for spintronic applications but require tailored properties.

Purpose of the Study:

To investigate the relationship between crystal structure optimization and magnetic properties in organic materials.
To explore the phenomenon of spontaneous spin polarization and ferromagnetism in coronene-tetracyanoquinodimethane (TCNQ) based structures.
To demonstrate and characterize magnetoelastic coupling in organic ferromagnets.

Main Methods:

Crystal structure optimization of coronene-tetracyanoquinodimethane (TCNQ).
Charge transfer analysis to induce spin polarization.
Measurement of saturation magnetization and its dependence on lattice deformation.
Investigation of magnetic-field-induced lattice changes.

Main Results:

Optimized TCNQ structures exhibit non-degenerate spin-up and spin-down energy levels, leading to spontaneous spin polarization and ferromagnetism.
Significant magnetoelastic coupling was observed, where lattice deformation influences saturation magnetization in organic ferromagnets.
Magnetic-field-induced lattice shrinkage confirms spin-lattice-interaction-dependent magnetoelastic coupling.

Conclusions:

The design of organic crystal structures can controllably induce ferromagnetism and spin polarization.
Organic magnetoelastic coupling is a significant phenomenon in these materials.
This research paves the way for developing organic multiferroic magnetoelastic materials with mechanically tunable spin polarization.