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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...

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Updated: May 3, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

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Published on: May 12, 2023

Decoding THz-Driven Dynamic Fingerprints of Ferroelectric Nanotwin Networks.

Xiaojiang Li¹, Aiden Ross¹, Vladimir A Stoica^1,2

¹Department of Materials Science and Engineering and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, USA.

Advanced Materials (Deerfield Beach, Fla.)

|May 2, 2026

Summary

This summary is machine-generated.

Scientists observed ultrafast domain wall motion in ferroelectrics using advanced X-ray and optical techniques. This discovery enables dynamic electrical control of domain walls for future high-speed electronic devices.

Keywords:

THz dynamics ferroelectrics nanodomain network optical second harmonic generation ultrafast X‐ray diffraction

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Ferroelectric materials exhibit ultrafast polarization dynamics crucial for advanced electronics.
Domain walls in ferroelectric nanostructures can support collective dynamics in the terahertz regime.
Tracking polarization and strain evolution under ultrafast stimulus is essential for understanding these dynamics.

Purpose of the Study:

To investigate ultrafast polarization dynamics in ferroelectric superlattices.
To characterize collective dynamics of domain walls in the terahertz regime.
To explore methods for ultrafast control of ferroelectric properties.

Main Methods:

Multi-modal probing combining X-ray free electron laser (XFEL) measurements and optical second harmonic generation (SHG).
THz-pulse-driven excitations in PbTiO₃/SrTiO₃ superlattices.
Dynamical phase-field modeling to fingerprint collective modes.

Main Results:

Observed ultrafast domain wall motion at 0.1-0.5 THz with velocities exceeding 4000 m/s.
Discovered a novel 'charging' mode enabling electrical control of domain wall conductivity on a picosecond timescale.
Fingerprinted collective modes as superpositions of domain 'breathing' and polarization 'rotations'.

Conclusions:

Integrated experimental and theoretical approaches enable fingerprinting of ferroelectric dynamical landscapes.
Ultrafast control of ferroelectric domain walls is achievable, paving the way for high-speed microelectronics and optical applications.
The discovered 'charging' mode offers dynamic tuning of domain wall conductivity.