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Magnetization-structure-composition phase diagram mapping in Co-Fe-Ni alloys using diffusion multiples and scanning
Girfan Shamsutdinov1, Peng Zhao2, Sreenivas Bhattiprolu3,4
1Department of Physics and Astronomy, Wayne State University, 666 W. Hancock Rd, Detroit, MI, 48201, USA.
Scientific Reports
|February 5, 2022
Summary
Researchers developed a new method using scanning Hall probe microscopy to create detailed magnetic property maps for cobalt-iron-nickel alloys. This high-throughput technique accelerates the discovery of advanced magnetic materials for applications like data storage.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- Transition metal alloys are critical for magnetic recording and memory devices.
- Conventional methods for measuring saturation magnetization are time-consuming and limited to discrete compositions.
Purpose of the Study:
- To develop a high-throughput method for creating complete saturation magnetization diagrams for Co-Fe-Ni alloys.
- To utilize scanning Hall probe microscopy (SHPM) combined with a combinatorial approach for efficient materials characterization.
Main Methods:
- A composition gradient was fabricated using the diffusion multiple technique to create a combinatorial library of Co-Fe-Ni alloys.
- Scanning Hall probe microscopy (SHPM) was employed for pixel-by-pixel magnetic field measurements.
- Energy dispersive X-ray spectroscopy and electron backscatter diffraction were used for composition and phase analysis.
Main Results:
- Complete saturation magnetization diagrams for Co-Fe-Ni alloys were successfully constructed.
- The study confirmed Slater-Pauling behavior in binary alloys and identified a maximum at ~32 at% Co for Co-Fe alloys.
- SHPM enabled a significantly denser data distribution compared to previous studies.
Conclusions:
- SHPM, coupled with combinatorial methods, is a powerful tool for high-throughput characterization of magnetic materials.
- This approach provides an effective metrology platform for accelerating the discovery of new magnetic materials.
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