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

Polymers

Alessandro Longo¹  Jamo Momand²  BartJ. Kooi²  Giuseppe Portale²  Justin Varghese²  Ali Syari’ati²  Petra Rudolf²  Jin Xu²  Katja Loos²  JeroenA. Heuver²  Beatriz Noheda² 

[1] Netherlands Organization for Scientific Research (NWO), European Synchrotron Radiation Facility (ESRF), DUBBLE-CRG, 38000 Grenoble, France;Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands;

关键词: chemical solution deposition;    block copolymer;    2d arrays;    cobalt ferrite;    nanodot;    ferrimagnetic;   

DOI  :  10.3390/polym11101598

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown