Fabrication of GeNi<sub>2</sub>O<sub>4</sub>, GeCu<sub>2</sub>O<sub>4</sub>, and MgCr<sub>2</sub>O<sub>4</sub> Epitaxial Thin Films
ORAL
Abstract
In the AB2O4 spinel system with B site magnetic, a rich variety of magnetic and orbital frustration has been observed. Highlighted phenomenons like spin-liquid phase and field-induced novel phase transitions were seen in these single-crystal systems extensively. Here we report on the first growth of the (001)-oriented GeNi2O4, (001)-oriented GeCu2O4 and (111)-oriented MgCr2O4. All fabricated films were characterized by X-ray diffraction and X-ray photoelectron spectroscopies confirming both crystalline epitaxy and chemical stoichiometry. Synchrotron-based X-ray absorption spectroscopies were also carried out to prove the correct electronic state. The availability of single-crystalline thin films can pave the road to understand the magnetic ordering of differently-oriented spinels in an ultra-thin limit.
*This work was supported by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF4534, and by the Department of Energy under Grant No. DESC0012375. This research used resources of the Advanced Light Source, which is a Department of Energy Office of Science User Facility under Contract No. DEAC0205CH11231.
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Presenters
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Fangdi Wen
- Rutgers University, New Brunswick