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Strain and Surface Effects on Magnetization of Nickel Cobaltate Thin Films

Thesis Defense

Date: Time: 2:00 pm–3:30 pm
Jorgensen Hall
Contact: Physics Department, (402) 472-2770,
Corbyn Mellinger will defend his thesis, “Strain and Surface on Magnetization of Nickel Cobaltate Thin Films” via Zoom.

Join Zoom Meeting: Meeting ID: 920 0864 7812

Abstract: Research into the behavior of NiCo2O4 (NCO) has accelerated in the last two decades, especially due to its promising applications in catalysis and in supercapacitive energy storage. The transport properties of NCO have been shown to be tied to its magnetic behavior, suggesting research into the magnetism of the material, especially in thin film form, may help inform other aspects of its properties.

In this defense, we present observations of strong magnetic anisotropy for epitaxial films grown via pulsed laser deposition onto MgAl2O4 substrates. This effect is explained spin-lattice coupling, due to the effect of epitaxial strain on the orbital states. Additionally, we demonstrate how the magnetization of the surface layer of the thin films is modulated from that the bulk, and mechanisms for this effect are presented.

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