- Post Doctoral
MIT Unit Affiliation:
- Materials Science and Engineering
Post Doc Sponsor / Advisor:
Date PhD Completed:
Top 3 Areas of Expertise:
Expected End Date of Post Doctoral Position:
To respond to the growing demand for smart and connected devices, such as smartphones, tablet PCs arid other mobile hardware, while meeting the needs for increased power efficiency, miniaturization and reduced manufacturing costs, new material solutions need to be considered. These should address the shortcomings of incumbent semiconductor-based technologies which provide a limited number of functionalities, suffer from high power consumption and heat dissipation, and whose conventional planar processing is increasingly complex and resource-intensive.
Potential replacement materials include complex oxides, which exhibit interesting physical phenomena such as superconductivity, colossal magnetoresistance and multiferroicity. New functionalities are especially found at interfaces between two oxides, including emergent electronic states like two-dimensional electron gases, enhanced ionic transport and magnetoelectric coupling, among many other.
In this this thesis, we focus on self-assembled oxide nanocomposites, which elegantly organize into vertical nanostructures via spontaneous phase-separation, naturally forming numerous such heterointerfaces. These provide a rich playground for studying interfacial effects, which could be used in future devices, and the self-assembly promises cheap arid high throughput manufacturing providing it can be integrated into useful architectures. BiFeO₃-CoFe₂O₄ self-assembled nanocomposites, in particular, have been studied for the magnetoelectric coupling that takes place between the ferrimagnetic spinel phase, which forms discrete vertical pillars, arid the ferroelectric perovskite phase, which forms a matrix that surrounds the spinel pillars.
Here, after an in-depth study of the mechanisms responsible for the formation of this self-assembled nanostructure, we develop a templating method enabling the precise control over the morphology of the film, resulting in useful structures for potential devices like magnetoelectric memories and logic devices. To study the structural, magnetic and electrical properties of our samples, a set of experimental and theoretical methods is developed, adapted to the unique requirements of these thin film nanostructures with iicron-scale ordering. Using finite element analysis and micromagnetic modeling, the effect of the strain-mediated magnetoelectic coupling on the magnetic switching of the CoFe₂O₄ nanopillars is predicted. Scanning Probe Microscopy is also used to characterize the local ferroelectric and magnetic behavior, and observe, for the first time in these templated composites, electrically-induced magnetic switching of the pillar magnetization.
The tools and methods developed in this thesis could pave the way towards a wider use of templated self-assembly to leverage the promising properties of oxide heterointerfaces and enable their use in future devices with low manufacturing costs.
Top 5 Awards and honors (name of award, date received):
5 Recent Papers:
Nicolas M. Aimon, Dong Hun Kim, Hong Kyoon Choi, Xueyin Sun, Caroline A. Ross (2014) "Templated Self-Assembly Of Functional Oxide Nanocomposites" Advanced Materials
Dong Hun Kim, Nicolas M. Aimon, Xue Yin Sun, Lior Kornblum, Fred. J. Walker, Charles. H. Ahn and Caroline A. Ross (2014) "Integration of Self-Assembled Epitaxial BiFeO3–CoFe2O4 Multiferroic Nanocomposites on Silicon Substrates" Advanced Functional Materials
Hong Kyoon Choi, Nicolas M. Aimon, Dong Hun Kim, Xue Yin Sun, Jessica Gwyther, Ian Manners, and Caroline A. Ross. (2014) "Hierarchical Templating of a BiFeO3–CoFe2O4 Multiferroic Nanocomposite by a Triblock Terpolymer Film" ACS Nano
Dong Hun Kim, Nicolas M. Aimon, Xueyin Sun, Caroline A. Ross (2013) "Compositionally Modulated Magnetic Epitaxial Spinel/Perovskite Nanocomposite Thin Films" Advanced Functional Materials