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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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Related Experiment Video

Updated: Jan 12, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Detecting Magnon-phonon coupling in yttrium iron garnet with variable temperature STEM-EELS.

Alexander Reifsnyder¹, Mohamed Nawwar¹, Minyue Zhu²

¹Department of Materials Science and Engineering, The Ohio State University, 140 W. 19th Avenue, Columbus, OH 43210, USA.

Ultramicroscopy

|November 1, 2025

Summary

This summary is machine-generated.

Researchers used scanning transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS) to study magnons (spin waves) in yttrium iron garnet. They observed magnon-phonon coupling, enabling nanoscale analysis of these important magnetic excitations.

Keywords:

EELS Magnon Magnon-phonon coupling Phonon Vibrational spectroscopy

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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

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Published on: October 5, 2013

Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Magnons, the quanta of spin waves, are crucial for advanced magnetic technologies.
Macroscopic techniques for magnon analysis lack nanoscale spatial resolution.
Understanding the interplay between material structure and magnons is key for applications.

Purpose of the Study:

To develop nanoscale analysis of magnons using combined STEM-EELS.
To investigate magnon-phonon coupling for indirect magnon detection.
To study magnon effects on phonon frequencies in yttrium iron garnet (YIG) flakes.

Main Methods:

Utilized scanning transmission electron microscopy (STEM) for high spatial resolution.
Employed monochromated electron energy-loss spectroscopy (EELS) for energy analysis.
Examined temperature-dependent phonon frequency shifts in individual YIG flakes.

Main Results:

Demonstrated nanoscale analysis of magnon-phonon coupling effects.
Observed non-linear, temperature-dependent shifts in phonon frequencies.
Confirmed magnon-phonon coupling influences vibrational properties in YIG.

Conclusions:

STEM-EELS enables high-precision, spatially resolved studies of magnon-phonon coupling.
This technique provides a pathway to study magnons indirectly via phonons.
Opens possibilities for nanoscale characterization of magnetic materials and devices.