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Open AccessArticle

Chemical Solution Deposition of Ordered 2D Arrays of Room-Temperature Ferrimagnetic Cobalt Ferrite Nanodots

1
Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands
2
Netherlands Organization for Scientific Research (NWO), European Synchrotron Radiation Facility (ESRF), DUBBLE-CRG, 38000 Grenoble, France
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(10), 1598; https://doi.org/10.3390/polym11101598
Received: 23 August 2019 / Revised: 15 September 2019 / Accepted: 17 September 2019 / Published: 30 September 2019
(This article belongs to the Special Issue Self-assembly of Block Copolymers)
Over the past decades, the development of nano-scale electronic devices and high-density memory storage media has raised the demand for low-cost fabrication methods of two-dimensional (2D) arrays of magnetic nanostructures. Here, we present a chemical solution deposition methodology to produce 2D arrays of cobalt ferrite (CFO) nanodots on Si substrates. Using thin films of four different self-assembled block copolymers as templates, ordered arrays of nanodots with four different characteristic dimensions were fabricated. The dot sizes and their long-range arrangement were studied with scanning electron microscopy (SEM) and grazing incident small-angle X-ray scattering (GISAXS). The structural evolution during UV/ozone treatment and the following thermal annealing was investigated through monitoring the atomic arrangement with X-ray absorption fine structure spectroscopy (EXAFS) and checking the morphology at each preparation step. The preparation method presented here obtains array types that exhibit thicknesses less than 10 nm and blocking temperatures above room temperature (e.g., 312 K for 20 nm diameter dots). Control over the average dot size allows observing an increase of the blocking temperature with increasing dot diameter. The nanodots present promising properties for room temperature data storage, especially if a better control over their size distribution will be achieved in the future. View Full-Text
Keywords: chemical solution deposition; block copolymer; 2D arrays; cobalt ferrite; nanodot; ferrimagnetic chemical solution deposition; block copolymer; 2D arrays; cobalt ferrite; nanodot; ferrimagnetic
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MDPI and ACS Style

Xu, J.; Varghese, J.; Portale, G.; Longo, A.; Momand, J.; Syari’ati, A.; Heuver, J.A.; Rudolf, P.; Kooi, B.J.; Noheda, B.; Loos, K. Chemical Solution Deposition of Ordered 2D Arrays of Room-Temperature Ferrimagnetic Cobalt Ferrite Nanodots. Polymers 2019, 11, 1598.

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