A comparative study of electrochemical and electrostatic doping modulation of magnetism in Fe3O4via ultracapacitor structure

Fangchao Gu; Leqing Zhang; Zhaohui Li; Jie Zhang; Yuanyuan Pan; Qinghao Li; Hongsen Li; Yufeng Qin; Qiang Li

doi:10.1088/1361-648X/ac8e47

A comparative study of electrochemical and electrostatic doping modulation of magnetism in Fe₃O₄via ultracapacitor structure

J Phys Condens Matter. 2022 Sep 16;34(45). doi: 10.1088/1361-648X/ac8e47.

Authors

Fangchao Gu¹, Leqing Zhang¹, Zhaohui Li¹, Jie Zhang², Yuanyuan Pan¹, Qinghao Li¹, Hongsen Li¹, Yufeng Qin³, Qiang Li¹

Affiliations

¹ College of Physics, University-Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, Qingdao 266071, People's Republic of China.
² College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, People's Republic of China.
³ College of Information Science and Engineering, Shandong Agricultural University, Taian, Shandong 271018, People's Republic of China.

PMID: 36044895
DOI: 10.1088/1361-648X/ac8e47

Abstract

Electric field control of magnetism can boost energy efficiency and have brought revolutionary breakthroughs in the development of widespread applications in spintronics. Electrolyte gating plays an important role in magnetism modulation. In this work, reversible room-temperature electric field control of saturation magnetization in Fe₃O₄via a supercapacitor structure is demonstrated with three types of traditional gate electrolytes for comparison. Different magnetization response and responsible mechanisms are revealed by Operando magnetometry PPMS/VSM and XPS characterization. The main mechanism in Na₂SO₄, KOH aqueous electrolytes is electrochemical effect, while both electrochemical and electrostatic effects were found in LiPF₆organic electrolyte. This work offers a kind of reference basis for selecting appropriate electrolyte in magnetism modulation by electrolyte-gating in the future, meanwhile, paves its way towards practical use in magneto-electric actuation, voltage-assisted magnetic storage, facilitating the development of high-performance spintronic devices.

Keywords: Fe3O4; control; electric; electrolyte-gating; magnetism; operando magnetometry; spintronic.