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Atomic Force Microscopy

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Compact piezo-driven rotatable magnetic force microscope in a cryogen-free magnet.

Yue Gao¹, Wenjie Meng^2,3, Yuchen Zhang¹

¹University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

The Review of Scientific Instruments

|December 11, 2025

Summary

We developed a compact, rotating magnetic force microscope for high-field magnets, enabling detailed studies of magnetic anisotropy in micron-scale materials at low temperatures. This innovation overcomes vibration challenges for advanced materials research.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

In situ rotation of scanning probe microscopes (SPMs) in high-field magnets is crucial for magnetic anisotropy studies.
Existing methods face significant technical challenges, limiting micron-scale investigations.

Purpose of the Study:

To demonstrate a compact, piezoelectrically driven rotatable magnetic force microscope (MFM) for operation within a cryogen-free superconducting magnet.
To enable micron-scale magnetic anisotropy studies at variable angles and temperatures.

Main Methods:

A novel nested coaxial piezoelectric scanning tube (PST) design was implemented for vibration resistance and expanded scan range.
The MFM was operated in a 50 mm bore, 12 T, cryogen-free superconducting magnet at temperatures down to 2 K.
Field-controlled magnetic domain evolution was imaged in 2D van der Waals magnet Fe3GaTe2.

Main Results:

The microscope achieved stable operation and imaging in a 12 T field and down to 2 K.
The nested PST design effectively reduced vibration interference and increased the scan range by 1.74x.
Magnetic domain evolution in Fe3GaTe2 revealed strong out-of-plane anisotropy and a characteristic 1/cos θ dependence of the saturation field.

Conclusions:

The developed vibration-resistant, rotating MFM is suitable for micron-scale magnetic anisotropy studies in high-field, cryogen-free environments.
The design principles can be extended to other SPM platforms for advanced materials characterization.
The system facilitates in-depth understanding of magnetic properties in novel 2D materials.