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Tunable magnetic anisotropy in multiferroic oxides
Tunable magnetic anisotropy in multiferroic oxides
- Source :
- Physical Review B. 103
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
Abstract
- Room-temperature electric-field control of magnetism is actively sought to realize electric-field assisted changes in perpendicular magnetic anisotropy (PMA), which is important to magnetic random access memories (MRAMs) and future spin-orbit based logic technologies. Traditional routes to achieve such control rely on heterostructures of ferromagnets and/or ferroelectrics, exploiting interfacial effects, including strain generated by the substrate, or electric-field induced changes in the interfacial electronic structures. Here we present design rules based on $d$-orbital splitting in an octahedral field and crystallographic symmetries for electric-field control of PMA utilizing hybrid improper ferroelectricity by scaffolding simple perovskite oxides into ultrashort period superlattices, ${(\mathrm{AB}{\mathrm{O}}_{3})}_{1}/{({\mathrm{A}}^{\ensuremath{'}}\mathrm{B}{\mathrm{O}}_{3})}_{1}$, and in multiferroic ${\mathrm{AA}}^{\ensuremath{'}}{\mathrm{BB}}^{\ensuremath{'}}{\mathrm{O}}_{6}$ double perovskites. We validate the strategy using first principles calculations and a single-ion anisotropic model. We find a change in the magnetic anisotropy from the in-plane to the out of plane direction in ${(\mathrm{BiFe}{\mathrm{O}}_{3})}_{1}/{(\mathrm{LaFe}{\mathrm{O}}_{3})}_{1}$ and a 50% decrease of the magnetization along the out of plane direction in $\mathrm{LaYNiMn}{\mathrm{O}}_{6}$, when a polar to nonpolar phase transition occurs with strain. The origin of the PMA control is due to the structural tunable competitions among the ${t}_{2g}$ and ${e}_{g}$ orbital interactions on the magnetic ions arising from relativistic spin-orbital interactions that are susceptible to changes in the oxygen octahedral tilts across the field-tunable transition. Our results allow us to search rapidly for other promising multiferroics materials with voltage-controlled magnetic anisotropy for applications in low-energy information storage and logic devices.
- Subjects :
- Physics
Phase transition
Condensed matter physics
Magnetism
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Ferroelectricity
Condensed Matter::Materials Science
Magnetization
Magnetic anisotropy
Ferromagnetism
0103 physical sciences
Multiferroics
010306 general physics
0210 nano-technology
Perovskite (structure)
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........b93499d0da91727d84dc7a31e87bd05a
- Full Text :
- https://doi.org/10.1103/physrevb.103.184417