Chin. Phys. Lett.  2022, Vol. 39 Issue (4): 047502    DOI: 10.1088/0256-307X/39/4/047502
Tunable Spin Hall Magnetoresistance in All-Antiferromagnetic Heterostructures
Lin Huang, Yongjian Zhou, Tingwen Guo, Feng Pan, and Cheng Song*
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Lin Huang, Yongjian Zhou, Tingwen Guo et al  2022 Chin. Phys. Lett. 39 047502
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Abstract We investigate the spin Hall magnetoresistance (SMR) in all-antiferromagnetic heterostructures $\alpha$-Fe$_{2}$O$_{3}$/Cr$_{2}$O$_{3}$ with Pt contacts. When the temperature is ultralow ($ < $ 50 K), the spin current generated in the Pt layer cannot be transmitted through Cr$_{2}$O$_{3}$ ($t = 4$ nm), and the SMR is near zero. Meanwhile, when the temperature is higher than the spin fluctuation temperature $T_{\rm F}$ ($\approx $ 50 K) of Cr$_{2}$O$_{3}$ and lower than its Néel temperature $T_{\rm N}$ ($\approx $ 300 K), the spin current goes through the Cr$_{2}$O$_{3}$ layer and is reflected at the $\alpha$-Fe$_{2}$O$_{3}$/Cr$_{2}$O$_{3}$ interface; an antiferromagnetic (negative) SMR is observed. As temperature increases higher than $T_{\rm N}$, paramagnetic (positive) SMR mainly arises from the spin current reflection at the Cr$_{2}$O$_{3}$/Pt interface. The transition temperatures from negative to positive SMR are enhanced with increasing Cr$_{2}$O$_{3}$ layer thickness, accompanied by the absence of SMR signals when $t = 10$ nm. Such a tunable SMR builds a bridge between spin transport and structures. It also enriches antiferromagnetic spintronics.
Received: 01 February 2022      Editors' Suggestion Published: 28 March 2022
PACS:  75.50.Ee (Antiferromagnetics)  
  85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)  
  75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))  
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Lin Huang
Yongjian Zhou
Tingwen Guo
Feng Pan
and Cheng Song
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