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Nanoscale Magnetic Arrays through Block Copolymer Templating of Polyoxometalates
Daniel R M Clyde1,2,3, David L Cortie4, Simon Granville3,5
1Department of Chemical and Materials Engineering, University of Auckland, Auckland 1010, New Zealand.
Nano Letters
|February 8, 2024
Summary
We developed a block copolymer method to create ordered magnetic nanostructures for energy-efficient spintronic and magnonic devices. This bottom-up approach successfully patterned magnetic substrates at the nanoscale.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Magnetic nanoarrays are crucial for developing energy-efficient spintronic and magnonic devices.
- Fabricating ordered magnetic nanostructures at the sub-100 nm scale remains a significant challenge.
Purpose of the Study:
- To present a block copolymer-assisted strategy for fabricating ordered magnetic nanostructures.
- To investigate the magnetic properties and influence of patterned polyoxometalate (POM) clusters on permalloy substrates.
Main Methods:
- Utilized block copolymer micelle-like structures as templates for POM cluster assembly.
- Employed microscopy and scattering techniques to characterize structural and organizational features.
- Investigated magnetic properties using polarized neutron reflectometry, nuclear magnetic resonance, and magnetometry.
Main Results:
- Successfully fabricated ordered magnetic nanostructures on silicon and permalloy substrates.
- Confirmed the opal-like assembly of POM clusters within the block copolymer template.
- Demonstrated that patterned POMs significantly influenced the magnetic properties of the underlying permalloy layer.
Conclusions:
- The block copolymer-assisted bottom-up pathway is a viable method for patterning magnetic substrates.
- Achieved a magnetic structural design suitable for spintronic and magnonic crystal devices.
- This approach enables the creation of magnetic nanostructures at the sub-100 nm scale.
