Composite nanowire-based probes for magnetic resonance force microscopy

Area of Science:

• Materials Science
• Nanotechnology
• Physics

Background:

• Atomic resolution magnetic resonance force microscopy (MRFM) requires highly sensitive and high-resolution probes.
• Existing MRFM probe fabrication methods face challenges in achieving the desired sensitivity and resolution simultaneously.

Purpose of the Study:

• To present a novel nanowire-based methodology for fabricating ultrahigh sensitivity and resolution MRFM probes.
• To integrate magnetic, optical, and mechanical functionalities into a single composite nanowire structure.

Main Methods:

• Fabrication involves electrochemical deposition of metals into nanoporous membranes.
• Chemically selective electroless deposition is used to add an optical nanoreflector.
• The composite nanowire features distinct magnetic, noble metal-enhanced, and nonmagnetic segments.

Main Results:

• The composite nanowire integrates essential elements for an ultrahigh sensitivity and resolution MRFM sensor.
• A magnetic segment provides atomic resolution magnetic field gradients and large force gradients.
• A noble metal-enhanced segment facilitates optical readout of nanowire vibration.
• A nonmagnetic segment forms the cantilever for mechanical detection.

Conclusions:

• The presented nanowire fabrication methodology enables the creation of advanced MRFM probes.
• This approach offers a pathway to significantly enhance sensitivity and resolution in MRFM.
• The composite structure facilitates atomic resolution magnetic field imaging and sensitive mechanical detection.