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Correlation of Interface Structure with Magnetic Exchange in a Hard/Soft Magnetic Model Nanostructure

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.
11, In: Physical Review Applied, (5), pp. 054078. American Physical Society (APS), ISSN 2331-7019,
DOI: 10.1103/PhysRevApplied.11.054078,
[Article]

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.
Title: Correlation of Interface Structure with Magnetic Exchange in a Hard/Soft Magnetic Model Nanostructure
Language: English
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.

Journal or Publication Title: Physical Review Applied
Volume: 11
Number: 5
Publisher: American Physical Society (APS)
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
DOI: 10.1103/PhysRevApplied.11.054078
Official URL: https://doi.org/10.1103/PhysRevApplied.11.054078
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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