研究目的
Investigating the influence of ferromagnet crystalline structures on spin Hall angle in ferromagnet/heavy metal bilayers with reversed stacking order.
研究成果
The study elucidates the role of crystalline structure and interface in the spin Hall angle of FM/HM bilayers, showing that an appropriate crystalline structure of FM with a larger work function is favored in enlarging the SHA. The results provide a route to harness interfacial symmetry breaking for SHA engineering via tuning the FM crystalline structure.
研究不足
The study focuses on the specific bilayers of Ta and Py, and the findings may not be directly applicable to other FM/HM combinations. The influence of other factors such as temperature and external magnetic fields on the spin Hall angle was not explored.
1：Experimental Design and Method Selection:
The study utilized X-ray diffraction and transmission electron microscopy to characterize the film crystalline structure and spin torque ferromagnetic resonance measurements to investigate the spin Hall angle.
2：Sample Selection and Data Sources:
Samples with reversed stacking structure of substrate/Ta (10 nm)/Py (6 nm)/SiO2 (2 nm) and substrate/Py (6 nm)/Ta (10 nm)/SiO2 (2 nm) were deposited onto naturally oxidized Si substrates at room temperature by magnetron sputtering.
3：List of Experimental Equipment and Materials:
Bruker D8 diffractometer for XRD measurements, TEM for crystalline structure characterization, and ST-FMR devices for spin Hall angle measurements.
4：Experimental Procedures and Operational Workflow:
The samples were prepared by magnetron sputtering, characterized by XRD and TEM, and then fabricated into devices for ST-FMR and resistivity measurements.
5：Data Analysis Methods:
The spin Hall angle was evaluated using the self-calibrated method, and the damping constant and spin mixing conductance were determined from the resonance linewidth of ST-FMR spectra.
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