研究目的
Investigating the anomalous Hall-like transverse magnetoresistance in Au thin films on Y3Fe5O12 to distinguish between proximity magnetization and spin Hall magnetoresistance effects.
研究成果
The observed magnitudes of the longitudinal and transverse magnetoresistances in YIG/Au and YIG/Pt systems are consistent with the spin Hall magnetoresistance framework, with no evidence of proximity magnetization via the anomalous Hall effect. This study provides a method to measure both longitudinal and transverse spin Hall magnetoresistance amplitudes for a wide range of MI/NM interfaces.
研究不足
The study assumes identical interface spin mixing conductivities in the reference Pt system and the Au system, which may not account for all potential differences between the two metals. The uncertainty in the calculation of SMR magnitudes for YIG/Au could decrease with better understanding of the Elliott-Yafet scaling constant and intrinsic spin Hall conductivity for Au.
1：Experimental Design and Method Selection:
The study involved measuring longitudinal and transverse magnetoresistances in a pure gold thin film on Y3Fe5O12 and comparing it with a YIG/Pt reference system using the SMR framework.
2：Sample Selection and Data Sources:
YIG/Au(10 nm) and YIG/Pt(2 nm) systems were prepared using DC sputtering on top of 3.5-μm-thick liquid phase epitaxy YIG/GGG substrates.
3：5-μm-thick liquid phase epitaxy YIG/GGG substrates.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Hall bars 100 μm wide and 800 μm long were patterned by e-beam lithography and Ar ion milling. Measurements were conducted in a liquid He cryostat with 9 T field and 360° sample rotation capabilities.
4：Experimental Procedures and Operational Workflow:
Longitudinal resistance and its angle dependent magnetoresistance were measured using a conventional Kelvin contact layout. Transverse resistance and its magnetoresistance were obtained by out-of-plane field Zero-Offset Hall measurements.
5：Data Analysis Methods:
The resistivity tensor of the NM layer in lab coordinates was analyzed to understand the SMR effects.
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