Bibliographic Details
| Title: |
Tailoring ferromagnetism through electrically controlled morphology |
| Authors: |
Vinai, Giovanni, Motti, Federico, Bonanni, Valentina, Cassese, Damiano, Prato, Stefano, Rossi, Giorgio, Panaccione, Giancarlo, Torelli, Piero |
| Source: |
Adv. Electron. Mater. 2019, 5, 1900150 |
| Publication Year: |
2018 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Materials Science |
| More Details: |
Converse magnetoelectric coupling in artificial multiferroics is generally modelled through three possible mechanisms: charge transfer, strain mediated or ion migration. Here we demonstrate a novel and highly reliable approach, where electrically controlled morphological modifications control the ferromagnetic response of a magnetoelectric heterostructure, specifically FexMn1-x ferromagnetic films on ferroelectric PMN-PT (001) substrates. The ferroelectric PMN-PT substrates present, in correspondence to electrical switching, fully reversible morphological changes at the surface, to which correspond reproducible modifications of the ferromagnetic response of the FexMn1-x films. Topographic analysis by atomic force microscopy shows the formation of surface cracks after application of a positive electric field up to 6 kV/cm, which disappear after application of negative voltage of the same amplitude. In-operando x-ray magnetic circular dichroic spectroscopy at Fe edge in FexMn1-x layers shows local variations of dichroic signal up to a factor 2.5 as a function of the electrically-driven morphological state. These findings highlight the role of morphology and surface topography as a key aspect in magnetoelectric coupling, whose proof of electrically reversible modification of the magnetic response adds a new possibility in the design of multiferroic heterostructures with electrically controlled functionalities. |
| Document Type: |
Working Paper |
| DOI: |
10.1002/aelm.201900150 |
| Access URL: |
http://arxiv.org/abs/1806.05414 |
| Accession Number: |
edsarx.1806.05414 |
| Database: |
arXiv |
