Multiferroic nanocomposite fabrication via liquid phase using anodic alumina template

Abstract

We report a novel and inexpensive fabrication process of multiferroic nanocomposite via liquid phase using an anodic alumina template. The sol-gel spin-coating technique was used to coat the template with ferrimagnetic CoFe2O4. By dissolving the template with NaOH aqueous solution, a unique nanotube array structure of CoFe2O4 was obtained. The CoFe2O4 nanotube arrays were filled with, and sandwiched in, ferroelectric BaTiO3 layers by a sol-gel spin-coating method to obtain the composite. Its multiferroicity was confirmed by measuring the magnetic and dielectric hysteresis loops.

Nanomaterial Fabrication through the Modification of Sol–Gel Derived Coatings

“…The use of the sol–gel method has recently gained pace for film-type, templated multiferroic films as well as heterostructure composite formation [ 115 , 116 ]. In the formation of BaTiO 3 (BTO)-CoFe 2 O 4 (CFO) multiferroic composite, Kawamura et al, used the sol–gel route in the fabrication, as follows: BaTiO 3 (BTO) (ferroelectric) was first sol–gel spin-coated on a Pt-deposited SiO 2 wafer [ 117 ]. Then, using anodic alumina oxide (AAO) as a template, the sol–gel spin-coating of a CoFe 2 O 4 (CFO) (ferrimagnetic) was carried out.…”

“…From top to bottom: (anodic alumina oxide (AAO)-placed) BTO compact layer on a Pt-coated SiO 2 substrate; CFO nanotube arrays on BTO/Pt/SiO 2 ; BTO coated CFO nanotube arrays on BTO/Pt/SiO 2 . Reprinted with permission from [ 117 ], copyright (2018) Taylor and Francis.…”

“…These films can be used in nanocomposites for micro-electromechanical systems [119], multiferroics [120,121], and bone tissue engineering [122]. [117], copyright (2018) Taylor and Francis.…”