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β-tungsten: a promising metal for spintronics
1Brazilian Nanotechnology National Laboratory (LNNano), CNPEM, 13083-970 Campinas, Brazil.
Summary
Ultrathin β-tungsten films are promising for spintronics. Depositing manganese (Mn) on these films creates a giant in-plane magnetic anisotropy, which can be tuned for device applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Ultrathin films of beta-tungsten (β-tungsten) are crucial for spintronic applications.
- Incorporating these films into multilayers enhances their potential.
- Understanding magnetic properties at the atomic scale is key for advanced devices.
Purpose of the Study:
- To investigate the feasibility of depositing manganese (Mn) monolayers on β-tungsten surfaces.
- To analyze the magnetic properties, specifically magneto-crystalline anisotropy, of Mn/β-tungsten interfaces.
- To explore the potential of β-tungsten-based multilayers for spintronics.
Main Methods:
- First-principles calculations were employed to model Mn adsorption on two distinct (001) β-tungsten surfaces.
- Analysis focused on the electronic structure and magnetic properties of the Mn monolayer.
- Simulations were performed to study the effect of subsequent β-tungsten capping layers.
Main Results:
- It is viable to deposit a single Mn layer on both non-equivalent (001) β-tungsten surfaces.
- The ferromagnetic Mn monolayer exhibits a giant in-plane magneto-crystalline anisotropy (>12 meV/Mn atom).
- Capping the Mn monolayer with β-tungsten layers reorients the magnetization easy axis perpendicular to the film plane.
Conclusions:
- Mono-crystalline β-tungsten thin films are excellent substrates for magnetic monolayers.
- The tunable magnetic anisotropy in Mn/β-tungsten systems opens avenues for spintronic device engineering.
- Multilayer structures involving β-tungsten offer a promising platform for future spintronic applications.
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