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摘要

如何避免界面反应、可靠地提取材料的自旋极化率是自旋电子学的一个基本问题. 本文选取了一种独特的铁磁性层状过渡族金属硫化物Fe _0.26TaS ₂, 研究了单晶材料的磁性、电子输运和Andreev反射谱. 磁性和输运结果表明, 低温下Fe _0.26TaS ₂单晶存在强磁各向异性、双峰磁电阻和反常霍尔效应. 通过干法转移方案制备的干净界面的Fe _0.26TaS ₂超导异质结的Andreev反射谱, 发现该材料的自旋极化率为47% ± 7%. 本文展示的干法转移制备超导/磁性异质结的方法可广泛用于测量各种二维磁性材料的自旋极化率.

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Abstract

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 _0.26TaS ₂with 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 _0.26TaS ₂single crystal is observed. Curie temperature T _Cof the Fe _0.26TaS ₂single crystal is confirmed by zero field cooling, field cooling and Arrot plot. The electronic transport in the Fe _0.26TaS ₂single crystal also reveals strong anisotropic behaviors, such as butterfly-like magnetoresistance and obvious anomalous hall effect below T _C. To obtain the spin polarization of Fe _xTaS ₂, we fabricate an Fe _xTaS ₂/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 _0.26TaS ₂/Al/Pb superconductor junction by evaporating Al and then Pb film on the surface of Fe _0.26TaS ₂in 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 _0.26TaS ₂/NbSe ₂junction is fabricated through mechanical-exfoliation and dry-transfer method. Through the Andreev reflection spectrum of this junction, the spin polarization of Fe _0.26TaS ₂is 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 _0.26TaS ₂is a promising candidate of next-generation material of spintronics.

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通信作者:徐同帅,xutongshuai@iphy.ac.cn

基金项目:国家自然科学基金(批准号: 61425015, 11704006)、中国科学院B类战略性先导科技专项(批准号: XDB28000000)和国家重点研发计划(批准号: 2016YFA0300600)资助的课题

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Corresponding author:Xu Tong-Shuai,xutongshuai@iphy.ac.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos 61425015, 11704006), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000), and the National Key Research and Development Program of China (Grant No. 2016YFA0300600)

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