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Synthesis and applications of magnetic van der Waals material: Transition metal phosphorus tri-chalcogenides
자기 반데르발스 물질인 전이금속 삼황화린의 합성과 응용

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Authors
이성민
Advisor
박제근
Major
자연과학대학 물리·천문학부(물리학전공)
Issue Date
2018-08
Publisher
서울대학교 대학원
Description
학위논문 (석사)-- 서울대학교 대학원 : 자연과학대학 물리·천문학부(물리학전공), 2018. 8. 박제근.
Abstract
Among van der Waals materials which have a layered structure and a weak van der Waals interaction between the layers, the magnetic transition metal phosphorus tri-chalcogenides (TMPX3) were studied. Especially, the exfoliated flakes of TMPX3 were obtained by mechanical exfoliation on various substrates and studied as a form of tunnel junction using the vertical transport measurement.

I studied tunneling transport properties of several exfoliated MnPS3 flakes with thickness varying from monolayer to a few tens of layers. To measure current through the ultrathin nanostructures, conductive atomic force microscopy was the instrument of choice. Using the results, I estimated several key parameters of MnPS3 down to the monolayer such as tunneling barrier height and dielectric breakdown strength.

In addition, the first vdW heterostructure with few-layers of NiPS3 was realized by dry transfer technique using the new polymer called polycaprolactone. I performed vertical transport measurements in this system and successfully observed semiconducting behavior with the key features of a Schottky junction. I expect that these results will prove helpful for further research on magnetism and spintronics in vdW systems.
Language
English
URI
https://hdl.handle.net/10371/144150
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College of Natural Sciences (자연과학대학)Dept. of Physics and Astronomy (물리·천문학부)Physics (물리학전공)Theses (Master's Degree_물리학전공)
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