Disentangling Highly Asymmetric Magnetoelectric Effects in Engineered Multiferroic Heterostructures
| Autor: | Blai Casals, Rafael Cichelero, Enric Menéndez, Veronica Sireus, Massimiliano Stengel, Gervasi Herranz, Ignasi Fina, Mikko Kataja, Maria Dolors Baró, Gustau Catalan, Jordi Sort, Santiago Suriñach, Alberto Manuel Quintana |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Magnetism Magnetoelectric effect General Physics and Astronomy 02 engineering and technology 01 natural sciences Magnetization Asymmetric response Electric field Crystallographic orientations 0103 physical sciences Multiferroics Polarization reversals 010306 general physics Polarization (electrochemistry) Ferroelectric substrate Magnetoelectric response PbTiO3 ferroelectric Condensed matter physics Ferromagnetic ferroelectrics Heterojunction 021001 nanoscience & nanotechnology Ferroelectricity 3. Good health Ferroelectric polarization 0210 nano-technology |
| Zdroj: | Physical Review Applied Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Recercat: Dipósit de la Recerca de Catalunya Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) Digital.CSIC. Repositorio Institucional del CSIC instname Recercat. Dipósit de la Recerca de Catalunya |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.12.014041 |
| Popis: | One of the main strategies to control magnetism by voltage is the use of magnetostrictive-piezoelectric hybrid materials, such as ferromagnetic-ferroelectric heterostructures. When such heterostructures are subjected to an electric field, piezostrain-mediated effects, electronic charging, and voltage-driven oxygen migration (magnetoionics) may simultaneously occur, making the interpretation of the magnetoelectric effects not straightforward and often leading to misconceptions. Typically, the strain-mediated magnetoelectric response is symmetric with respect to the sign of the applied voltage because the induced strain (and variations in the magnetization) depends on the square of the ferroelectric polarization. Conversely, asymmetric responses can be obtained from electronic charging and voltage-driven oxygen migration. By engineering a ferromagnetic-ferroelectric hybrid consisting of a magnetically soft 50-nm thick Fe 75 Al 25 (at. %) thin film on top of a 〈110〉-oriented Pb ( Mg 1 / 3 Nb 2 / 3 ) O 3 - 32 Pb Ti O 3 ferroelectric crystal, a highly asymmetric magnetoelectric response is obtained and the aforementioned magnetoelectric effects can be disentangled. Specifically, the large thickness of the Fe 75 Al 25 layer allows dismissing any possible charge accumulation effect, whereas no evidence of magnetoionics is observed experimentally, as expected from the high resistance to oxidation of Fe 75 Al 25 , leaving strain as the only mechanism to modulate the asymmetric magnetoelectric response. The origin of this asymmetric strain-induced magnetoelectric effect arises from the asymmetry of the polarization reversal in the particular crystallographic orientation of the ferroelectric substrate. These results are important to optimize the performance of artificial multiferroic heterostructures. |
| Databáze: | OpenAIRE |
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