Large-Area Nanopillar Arrays by Glancing Angle Deposition with Tailored Magnetic Properties

Area of Science:

• Materials Science
• Nanotechnology
• Magnetism

Background:

• Ferromagnetic films with controlled nanostructures are crucial for advanced magnetic applications.
• Glancing angle deposition (GLAD) offers a pathway to engineer film morphology at the nanoscale.

Purpose of the Study:

• To investigate the influence of magnetron sputtering glancing angle deposition (MS-GLAD) parameters on the structural and magnetic properties of Fe and Fe2O3 nanopillar films.
• To explore the relationship between film morphology and magnetic characteristics like anisotropy and coercivity.

Main Methods:

• Fabrication of polycrystalline Fe and Fe2O3 nanopillar films using MS-GLAD on large areas.
• Control of nanopillar orientation (vertical vs. tilted) by substrate rotation during deposition.
• Characterization of film morphology and magnetic properties, including hysteresis loops, coercivity, and magnetic anisotropy.
• Utilized first-order reversal curve (FORC) diagrams and micromagnetic simulations.

Main Results:

• MS-GLAD enables the growth of ferromagnetic films with thicknesses down to tens of nanometers.
• Film morphology, specifically nanopillar orientation, is controllable via substrate rotation and collimator masks.
• Tilted, isolated nanopillars fabricated using a collimator mask exhibit magnetic hardening.
• Growth-induced uniaxial anisotropy, linked to surface morphology, significantly impacts magnetic signatures.

Conclusions:

• MS-GLAD is a versatile technique for fabricating large-area nanostructured films with tunable magnetic properties.
• Morphology control is key to tailoring magnetic behavior, offering potential for technological applications.
• Understanding growth-induced anisotropy is essential for optimizing magnetic performance in nanostructured films.