Sabet, S. ; Moradabadi, A. ; Gorji, S. ; Fawey, M. H. ; Hildebrandt, E. ; Radulov, I. ; Wang, D. ; Zhang, H. ; Kübel, C. ; Alff, L. (2019)
Correlation of Interface Structure with Magnetic Exchange in a Hard/Soft Magnetic Model Nanostructure.
In: Physical Review Applied, 11 (5)
doi: 10.1103/PhysRevApplied.11.054078
Article, Bibliographie
Abstract
Synthesis of hard/soft magnetically exchange-coupled heterostructures is one promising way to design energy-efficient rare-earth-free artificial magnetic materials for application as permanent magnets and in spintronics. As a model system, we experimentally investigate MnGa/FeCo bilayers and simulate their physical behavior in a combined density functional theory and micromagnetic approach. Using high-quality L10−Mn1.5Ga thin films with bulklike magnetic properties, we show that optimal coherent exchange coupling is obtained below a critical soft magnetic layer thickness that depends on the interface structure and composition. In particular, for atomically smooth and matched epitaxial interfaces of L10−Mn1.5Ga to a Co-terminated and Co-rich FeCo layer, coherent exchange coupling is observed for FeCo thicknesses below 2 nm. In optimized bilayers, the magnetic coercivity of MnGa (approximately 6 kOe) can be fully conserved while the overall saturation magnetization is increased beyond 1000emu/cm3. Our model correlates interface structure and magnetic exchange coupling, providing guidelines to engineer high-performance exchange-coupled heterostructures for permanent magnets or spintronic devices.
| Item Type: | Article |
|---|---|
| Erschienen: | 2019 |
| Creators: | Sabet, S. ; Moradabadi, A. ; Gorji, S. ; Fawey, M. H. ; Hildebrandt, E. ; Radulov, I. ; Wang, D. ; Zhang, H. ; Kübel, C. ; Alff, L. |
| Type of entry: | Bibliographie |
| Title: | Correlation of Interface Structure with Magnetic Exchange in a Hard/Soft Magnetic Model Nanostructure |
| Language: | English |
| Date: | 29 May 2019 |
| Publisher: | American Physical Society (APS) |
| Journal or Publication Title: | Physical Review Applied |
| Volume of the journal: | 11 |
| Issue Number: | 5 |
| DOI: | 10.1103/PhysRevApplied.11.054078 |
| URL / URN: | https://doi.org/10.1103/PhysRevApplied.11.054078 |
| Abstract: | Synthesis of hard/soft magnetically exchange-coupled heterostructures is one promising way to design energy-efficient rare-earth-free artificial magnetic materials for application as permanent magnets and in spintronics. As a model system, we experimentally investigate MnGa/FeCo bilayers and simulate their physical behavior in a combined density functional theory and micromagnetic approach. Using high-quality L10−Mn1.5Ga thin films with bulklike magnetic properties, we show that optimal coherent exchange coupling is obtained below a critical soft magnetic layer thickness that depends on the interface structure and composition. In particular, for atomically smooth and matched epitaxial interfaces of L10−Mn1.5Ga to a Co-terminated and Co-rich FeCo layer, coherent exchange coupling is observed for FeCo thicknesses below 2 nm. In optimized bilayers, the magnetic coercivity of MnGa (approximately 6 kOe) can be fully conserved while the overall saturation magnetization is increased beyond 1000emu/cm3. Our model correlates interface structure and magnetic exchange coupling, providing guidelines to engineer high-performance exchange-coupled heterostructures for permanent magnets or spintronic devices. |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology 11 Department of Materials and Earth Sciences > Material Science > In-situ electron microscopy 11 Department of Materials and Earth Sciences > Material Science > Theory of Magnetic Materials |
| Date Deposited: | 30 Mar 2020 09:13 |
| Last Modified: | 13 Jan 2024 16:57 |
| PPN: | |
| Projects: | The authors acknowledge the LOEWE project RESPONSE funded by the Ministry of Higher Education, Research and the Arts (HMWK) and the high-performance computer center of Hessen (Lichtenberg). |
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