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Co/Au multisegmented nanowires: a 3D array of magnetostatically coupled nanopillars
C Bran1, Yu P Ivanov2,3,4, J Kosel2
1Institute of Materials Science of Madrid, CSIC, E-28049 Madrid, Spain.
Nanotechnology
|February 1, 2017
Summary
Arrays of multisegmented cobalt/gold nanowires exhibit enhanced magnetic properties due to segment coupling. This research paves the way for synchronized magnetic nano-oscillators in nanoelectronics.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Multisegmented nanowires offer tunable magnetic properties.
- Controlling interfaces and crystallographic structure is key for advanced magnetic applications.
Purpose of the Study:
- To fabricate and characterize multisegmented cobalt/gold (Co/Au) nanowires.
- To investigate the magnetic behavior and coupling mechanisms within these nanowires.
- To explore their potential as synchronized magnetic nano-oscillators.
Main Methods:
- Electrodeposition into aluminum oxide templates for nanowire fabrication.
- High-resolution transmission electron microscopy (HRTEM) for interface and structure analysis.
- Magnetic hysteresis loop measurements for magnetic property evaluation.
- Micromagnetic simulations to understand magnetic coupling.
Main Results:
- Successfully prepared multisegmented Co/Au nanowires with controlled dimensions.
- HRTEM confirmed high-quality Co/Au interfaces and Co segment crystallographic structure.
- Multisegmented nanowires demonstrated significantly larger coercivity and squareness compared to single-segment Co nanowires.
- Micromagnetic simulations validated experimental findings, attributing magnetic behavior to magnetostatic coupling.
Conclusions:
- The designed multisegmented Co/Au nanowire structure enhances magnetic properties.
- Magnetostatic coupling between segments is the primary driver of the observed magnetic behavior.
- This innovative structure is a promising platform for 3D arrays of synchronized magnetic nano-oscillators for nanoelectronic applications.
