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Polarity-tunable spin transport in all-oxide multiferroic tunnel junctions

Research paper by Rohit Soni, Adrian Petraru, Harikrishnan S. Nair, Ondrej Vavra, Martin Ziegler, Seong Keun Kim, Doo Seok Jeong, Hermann Kohlstedt

Indexed on: 12 May '16Published on: 26 Apr '16Published in: Nanoscale



Abstract

A multiferroic tunnel junction (MFTJ) promisingly offers multinary memory states in response to electric- and magnetic-fields, referring to tunneling electroresistance (TER) and tunneling magnetoresistance (TMR), respectively. In spite of recent progress, a substantial number of questions concerning the understanding of these two intertwined phenomena still remain open, e.g. the role of microstructural/chemical asymmetry at the interfaces of the junction and the effect of an electrode material on the MFTJ properties. In this regard, we look into the multiferroic effect of all-complex-oxide MFTJ (La0.7Sr0.3MnO3/Pb(Zr0.3Ti0.7)O3/La0.7Sr0.3MnO3). The results reveal apparent TER-TMR interplay—captured by the reversible electric-field control of the TMR effect. Finally, microscopy analysis on the MFTJ revealed that the observed TER-TMR interplay is perhaps mediated by microstructural and chemical asymmetry in our nominally symmetric MFTJ.

Graphical abstract 10.1039/C6NR01277A.gif