title: Conduction control at ferroic domain walls via external stimuli.
abstract: Intriguing functionalities at nano-sized domain walls have recently spawned a new paradigm for developing novel nanoelectronics due to versatile characteristics. In this study, we explore a new scenario to modulate the local conduction of ferroic domain walls. Three controlling parameters, i.e., external electrical field, magnetic field and light, are introduced to the 90° domain walls (90° DWs) of BiFeO₃. Electrical modulation is realized by electrical transport, where the mobility of 90° DWs can be altered by gating voltage. We further use the ferromagnetic/antiferromagnetic coupling to reveal the inherent magnetism at the DWs. With an established magnetic nature, magnetotransport has been conducted to introduce magnetic controlling parameter, where a giant positive magnetoresistance change can be observed up to 200%. In addition, light modulated conduction, a core factor for multifunctional applications, is successfully demonstrated (current enhancement by a factor of 2 with 11 W white lamp). These results offer new insights to discover the tunability of domain wall nanoelectronics.
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University, Room 709, Engineering Building VI, 1001 University Road, Hsinchu, 30010, Taiwan. yhc@nctu.edu.tw.
authors.forename: J C
authors.initials: JC
authors.lastname: Yang
authors.forename: C H
authors.initials: CH
authors.lastname: Yeh
authors.forename: Y T
authors.initials: YT
authors.lastname: Chen
authors.forename: S C
authors.initials: SC
authors.lastname: Liao
authors.forename: R
authors.initials: R
authors.lastname: Huang
authors.forename: H J
authors.initials: HJ
authors.lastname: Liu
authors.forename: C C
authors.initials: CC
authors.lastname: Hung
authors.forename: S H
authors.initials: SH
authors.lastname: Chen
authors.forename: S L
authors.initials: SL
authors.lastname: Wu
authors.forename: C H
authors.initials: CH
authors.lastname: Lai
authors.forename: Y P
authors.initials: YP
authors.lastname: Chiu
authors.forename: P W
authors.initials: PW
authors.lastname: Chiu
authors.forename: Y H
authors.initials: YH
authors.lastname: Chu