Fabrication of FeOx thin films and the modulation of transport and magnetic properties by resistance switching in Au/α-Fe 2O3/Pt heterostructure

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[1] Yun, C.
[2] Chen, X.G.
[3] Fu, J.B.
[4] Zhang, Y.X.
[5] Sun, J.R.
[6] Wang, Y.F.
[7] Zhang, Y.
[8] Liu, S.Q.
[9] Lian, G.J.
[10] Yang, Y.C.
[11] Wang, C.S.
[12] Yang, J.B.
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Wang, C.S. (wangcs@pku.edu.cn) | 1600年 / American Institute of Physics Inc.卷 / 115期
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It was found that by using the same α-Fe2O3 target in fabrication process; an oxygen-deficient and an oxygen-sufficient atmosphere facilitated the formation of Fe3O4 and α-Fe2O3; respectively. The Au/α-Fe 2O3/Pt heterostructure showed a memristive bipolar resistance switching. A clear difference was observed in the transport and magnetic properties between the two resistance states. The enhanced conductivity and magnetization in the Au/α-Fe2O3/Pt heterostructure are believed to result from an enhanced electron hopping between Fe3+-Fe2+ pairs and Fe3+-O-Fe2+ double exchange coupling effect. The enhanced Fe2+ comes from a redox transition between two phases (one behaves like Fe3O4 and the other like α-Fe2O3); due to the electrochemical migration of oxygen vacancies. © 2014 AIP Publishing LLC;
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