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• W3016105568 abstract "<sec>An elementary mission of spintronics research is to prevent the interface reacting in spin device and extract spin polarization of ferromagnetic material reliably. Layered transition metal sulfide has very strong anisotropic magnetism, magnetoresistance, and unique Hall effect. It provides a good platform for studying the magnetic order related physical phenomena and may lay a foundation for spintronic applications. In this work, the magnetism, electronic transport and Andreev reflection spectrum of a novel ferromagnetic material Fe_0.26TaS₂ with a layers-stacked structure are measured. Strong magnetic anisotropy, double-peak magnetoresistance and anomalous Hall effect are found. In the magnetic measurement, the strong magnetic anisotropy behavior in Fe_0.26TaS₂ single crystal is observed. Curie temperature <i>T</i>_C of the Fe_0.26TaS₂ single crystal is confirmed by zero field cooling, field cooling and Arrot plot. The electronic transport in the Fe_0.26TaS₂ single crystal also reveals strong anisotropic behaviors, such as butterfly-like magnetoresistance and obvious anomalous hall effect below <i>T</i>_C.</sec><sec>To obtain the spin polarization of Fe_<i>x</i>TaS₂, we fabricate an Fe_<i>x</i>TaS₂/superconductor Andreev junction to measure the spin polarization that is fitted by the modified Blonder-Tinkham-Klapwijk (BTK) theory. Perhaps the diffusion of Pb can form an alloy structure, creating another superconductor behavior. The two-gap BTK theory confirms our hypothesis, and the result spin polarization can reach 26%. To avoid the interference from Pb alloy superconductor, we also fabricate an Fe_0.26TaS₂/Al/Pb superconductor junction by evaporating Al and then Pb film on the surface of Fe_0.26TaS₂ in sequence. The results of BTK fit show that the spin polarization from the first technical route cannot be reliable due to the tunneling layer on the Al interface. In order to obtain a clean interface, Fe_0.26TaS₂/NbSe₂ junction is fabricated through mechanical-exfoliation and dry-transfer method. Through the Andreev reflection spectrum of this junction, the spin polarization of Fe_0.26TaS₂ is extracted to be 47% ± 7%. For various two-dimensional ferromagnetic materials, our work suggests that the dry-transfer method is well applicable in spin polarization extraction. The results of spin polarization indicate that the Fe_0.26TaS₂ is a promising candidate of next-generation material of spintronics.</sec>" @default.
• W3016105568 created "2020-04-17" @default.
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• W3016105568 date "2019-01-01" @default.
• W3016105568 modified "2023-09-26" @default.
• W3016105568 title "Andreev reflection spectroscopy of ferromagnetic Fe_0.26TaS₂ with layered structure" @default.
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• W3016105568 doi "https://doi.org/10.7498/aps.68.20191221" @default.
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