Nanopatterns of nickel on organosilane nanopatterns were prepared as model test structures for measurements of magnetic properties at the nanoscale. Electroless deposition (ELD) of nickel is accomplished by an autocatalytic redox reaction in which substrates are catalytically activated using a colloidal suspension of Pd species. Metallization is completed by placing activated substrates in a nickel plating bath containing Ni<sup>2+</sup> ions, a reducing agent and buffers. Particle lithography combined with steps of vapor deposition and immersion in plating solutions was applied to prepare samples. Particle lithography is a high throughput and reproducible method of nanopatterning that can produce arrays of organosilane nanostructures. Ring-shaped nanostructures of an amine-terminated organosilane, 3-aminopropyltriethoxysilane. (APTES) were prepared on Si(111) with vapor deposition onto a surface mask of latex spheres. Substrates containing organosilane nanorings were successively immersed in Pd catalyst solution and a nickel plating bath to enable chelation of nickel onto the active groups presented at the interface of APTES nanopatterns. Samples were characterized with tapping mode AFM after each reaction step to directly view surface changes. Magnetic sample modulation (MSM) is a combination of contact mode atomic force microscopy (AFM) and magnetic modulation of samples which provides a strategy to detect vibration of magnetic materials in response to an externally applied electromagnetic field. For MSM, a non-magnetic probe operated in contact mode for samples that are driven to vibrate with the flux of an external AC electromagnetic field. The changes in MSM phase and amplitude due to the motion of magnetic domains were detected and mapped with the MSM to identify areas of the magnetic nickel nanopatterns. Magnetic field strength and field frequency were tuned to study dynamic changes in the vibrational response of the nickel domains.

Electroless deposition of nickel on organosilane nanostructures prepared with particle lithography: Characterization with atomic force microscopy combined with magnetic sample modulation

255th National Meeting (2018)

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