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Abstract
In this study, we integrated bilayer structure of covered Pt on nickel zinc ferrite (NZFO) and CoFe/Pt/NZFO tri-layer structure by pulsed laser deposition system for a spin Hall magnetoresistance (SMR) study. In the bilayer structure, the angular-dependent magnetoresistance (MR) results indicate that Pt/NZFO has a well-defined SMR behavior. Moreover, the spin Hall angle and the spin diffusion length, which were 0.0648 and 1.31 nm, respectively, can be fitted by changing the Pt thickness in the longitudinal SMR function. Particularly, the MR ratio of the bilayer structure (Pt/NZFO) has the highest changing ratio (about 0.135%), compared to the prototype structure Pt/Y3Fe5O12 (YIG) because the NZFO has higher magnetization. Meanwhile, the tri-layer samples (CoFe/Pt/NZFO) indicate that the MR behavior is related with CoFe thickness as revealed in angular-dependent MR measurement. Additionally, comparison between the tri-layer structure with Pt/NZFO and CoFe/Pt bilayer systems suggests that the SMR ratio can be enhanced by more than 70%, indicating that additional spin current should be injected into Pt layer.
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Details
1 Department of Physics, National Cheng Kung University, Tainan, Taiwan
2 Institute of Physics of the ASCR, v. v. i., Cukrovarnicka 10, Praha 6, Czech Republic; Faculty of Biomedical Engineering, Czech Technical University, nam. Sitna 3105, Kladno, Czech Republic
3 Instrument Development Center, National Cheng Kung University, Tainan, Taiwan
4 Department of Physics, National Cheng Kung University, Tainan, Taiwan; Advanced Optoelectronic Technology Center (AOTC), National Cheng Kung University, Tainan, Taiwan; Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei, Taiwan