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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains.
Audrey C Parker1, Olivia O Maryon1, Mojtaba T Kaffash2
1Micron School of Materials Science & Engineering, Boise State University.
Journal of Visualized Experiments : Jove
|August 8, 2022
Summary
Magnetic force microscopy (MFM) was optimized in an inert atmosphere to achieve high-resolution imaging of nanomagnets and magnetic domains. This technique overcomes challenges like topographical artifacts and environmental contaminants for clearer magnetic field mapping.
Area of Science:
- Materials Science
- Nanotechnology
- Physics
Background:
- Magnetic Force Microscopy (MFM) maps local magnetic fields with nanoscale resolution using an Atomic Force Microscopy (AFM) probe.
- MFM sensitivity and resolution are influenced by lift height, oscillation amplitude, and environmental factors like water vapor.
- Standard MFM is more sensitive to out-of-plane magnetization, posing challenges for in-plane magnetic structures.
Purpose of the Study:
- To report high-resolution topographical and magnetic phase imaging of artificial spin-ice (ASI) arrays and magnetic shape memory alloys (MSMA) in an inert atmosphere.
- To optimize MFM parameters (lift height, drive amplitude) for enhanced resolution and sensitivity while mitigating topographical artifacts.
- To demonstrate MFM's capability in detecting stray magnetic fields from in-plane nanomagnets and resolving fine magnetic domain structures.
Main Methods:
- Utilized MFM within an inert (argon) atmosphere glovebox (<0.1 ppm O2 and H2O) to minimize environmental interference.
- Performed MFM on single and bicomponent nanomagnet artificial spin-ice (ASI) arrays and a Ni-Mn-Ga magnetic shape memory alloy (MSMA).
- Systematically varied lift height and drive amplitude to optimize imaging parameters for resolution, sensitivity, and artifact reduction.
Main Results:
- Achieved high-resolution topographical and magnetic phase images of ASI arrays, revealing stray fields from nanoscale bar magnets.
- Successfully demonstrated MFM in an inert atmosphere capable of resolving adjacent magnetic domains approximately 200 nm wide in MSMA.
- Optimized MFM parameters to balance high resolution and sensitivity against topographical artifacts and environmental contaminants.
Conclusions:
- MFM in a controlled inert atmosphere significantly enhances the ability to image magnetic nanostructures with high fidelity.
- The optimized MFM technique effectively overcomes limitations posed by environmental factors and probe-sample interactions.
- This approach provides a robust platform for detailed magnetic characterization of advanced nanomaterials and magnetic devices.
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