Thermal conductivity in self-assembled CoFe 2 O 4 /BiFeO 3 vertical nanocomposite films
Author(s)
Zhang, Chen; Huberman, Samuel C; Ning, Shuai; Pelliciari, Jonathan; Duncan, Ryan A; Liao, Bolin; Ojha, Shuchi; Freeland, John W; Nelson, Keith A; Comin, Riccardo; Chen, Gang; Ross, Caroline A; ... Show more Show less
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© 2018 Author(s). The thermal conductivity of self-assembled nanocomposite oxide films consisting of cobalt ferrite (CFO) spinel pillars grown within a single-crystal bismuth ferrite (BFO) perovskite matrix is described as a function of the volume fraction of the spinel. Single phase BFO and CFO had cross-plane thermal conductivities of 1.32 W m-1 K-1 and 3.94 W m-1 K-1, respectively, and the thermal conductivity of the nanocomposites increased with the CFO volume fraction within this range. A small increase (∼5%) in thermal conductivity for the pure CFO phase in the AC-demagnetized state was observed, suggesting possible magnon contributions. Steady state gray-medium based variance-reduced Monte Carlo simulations show consistent trends with experimental data on the dependence of thermal conductivity with the CFO volume fraction.
Date issued
2018Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Department of ChemistryJournal
Applied Physics Letters
Publisher
AIP Publishing