Electrodeposition of CoPt Magnetic Nanowires with Controlled Microstructure Using a Pt(111) Seed Layer

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Cobalt-platinum (CoPt) nanowires (NWs) are promising for magnetic applications.
• Controlling their microstructure and magnetic properties is essential for device performance.
• Electrodeposition offers a versatile method for nanowire synthesis.

Purpose of the Study:

• To investigate the effect of a Pt(111) seed layer on CoPt NW microstructure.
• To explore the synthesis of composite CoPt NWs using pulse electrodeposition.
• To analyze the magnetic properties and correlate them with structural characteristics.

Main Methods:

• CoPt NWs grown by single-bath electrodeposition on a Pt(111) seed layer.
• Characterization using FE-SEM, HR-TEM, XRD, and VSM.
• Constant potential and periodic pulse deposition techniques employed.

Main Results:

• Pt(111) seed layer promotes preferred (001) texture in CoPt NWs.
• Pulse deposition enables modulation of Pt content and creates composite NWs (metallic CoPt and Co oxide segments).
• CoPt NWs show strong uniaxial magnetic anisotropy correlated with the (001) hcp texture; oxide segments contribute negligibly to magnetism.

Conclusions:

• The Pt(111) seed layer is critical for controlling CoPt NW microstructure and texture.
• Periodic pulse deposition allows for the creation of novel composite CoPt NWs with tunable magnetic properties.
• The observed magnetic anisotropy is directly linked to the ordered hcp structure of CoPt segments.