Ionic liquid gating control of RKKY interaction in FeCoB/Ru/FeCoB and (Pt/Co)2/Ru/(Co/Pt)2 multilayers

Qu Yang, Lei Wang, Ziyao Zhou (), Liqian Wang, Yijun Zhang, Shishun Zhao, Guohua Dong, Yuxin Cheng, Tai Min, Zhongqiang Hu, Wei Chen, Ke Xia () and Ming Liu ()
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Qu Yang: Xi’an Jiaotong University
Lei Wang: Xi’an Jiaotong University
Ziyao Zhou: Xi’an Jiaotong University
Liqian Wang: Xi’an Jiaotong University
Yijun Zhang: Xi’an Jiaotong University
Shishun Zhao: Xi’an Jiaotong University
Guohua Dong: Xi’an Jiaotong University
Yuxin Cheng: Xi’an Jiaotong University
Tai Min: Xi’an Jiaotong University
Zhongqiang Hu: Xi’an Jiaotong University
Wei Chen: Argonne National Laboratory
Ke Xia: Beijing Normal University
Ming Liu: Xi’an Jiaotong University

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: Abstract To overcome the fundamental challenge of the weak natural response of antiferromagnetic materials under a magnetic field, voltage manipulation of antiferromagnetic interaction is developed to realize ultrafast, high-density, and power efficient antiferromagnetic spintronics. Here, we report a low voltage modulation of Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction via ionic liquid gating in synthetic antiferromagnetic multilayers of FeCoB/Ru/FeCoB and (Pt/Co)2/Ru/(Co/Pt)2. At room temperature, the distinct voltage control of transition between antiferromagnetic and ferromagnetic ordering is realized and up to 80% of perpendicular magnetic moments manage to switch with a small-applied voltage bias of 2.5 V. We related this ionic liquid gating-induced RKKY interaction modification to the disturbance of itinerant electrons inside synthetic antiferromagnetic heterostructure and the corresponding change of its Fermi level. Voltage tuning of RKKY interaction may enable the next generation of switchable spintronics between antiferromagnetic and ferromagnetic modes with both fundamental and practical perspectives.

Date: 2018
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DOI: 10.1038/s41467-018-03356-z

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