MCATM Seminar: Changgu Lee - Magnetic and Physical properties of new 2D materials

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Event Details

21 July 2017 at 11:00 am – 21 July 2017 at 12:00 pm
Room 407, Level 4, New Horizons Centre
Monash Clayton
Open to:
All welcome.
Engineering; Science; Seminars & Workshops


WHEN: 21 July 2017, 11AM 
WHAT: MCATM Seminar: Changgu Lee - Magnetic and Physical properties of new 2D materials 
WHERE: 407 New Horizons Centre.

Seminar Flyer can be downloaded here. All welcome.

Abstract: The representative 2D materials, graphene, h-BN, and MoS2, have interesting mechanical, electrical and optical properties and have exhibited fascinating physical phenomena so far. However, they mostly lack one important physical property in physics, magnetism. The new 2D materials such as CrSiTe3, CrI3, and FePS3, which began to be studied recently, possess ferro- or antiferro-magentic properties even in atomic level thickness and are expected to reveal deep level of physics in 2-dimensional confinement.

In this talk, our recent works on thickness dependence of magnetic and optical properties of ternary 2D materials, Fe3GeTe2 and CrPS4, which are ferromagnetic and antiferromagnetic 2D materials, will be presented. Fe3GeTe2 was studied with hall measurement and STM methods. From the hall measurement, it exhibited the anomalous hall effect due to its intrinsic ferromagnetism. Interestingly, the magnetic properties such as coercivity changed significantly with decreasing thickness changing from weak ferromagnet to strong ferromagnet.

STM study revealed some magnetic domains on the surface. The domain structures barely changed below Curie temperature, but disappeared above the critical temperature, which suggests they are magnetic structures. CrPS4, which is an antiferromagnet, was characterized with Raman and PL spectroscopies. Its bandgap was measured to be roughly 1.3 eV and its structure showed strong in-plane optical anisotropy.

About the Speaker: A/Prof. Changgu Lee joined the department of Mechanical Engineering and SKKU Advanced Institute of Nanotechnology, Suwon, Korea in 2010 after his postdoctoral appointment at Columbia University, New York, USA working with Prof. James Hone. Lee completed his PhD at Columbia University working on Power-MEMS for small energy generation. His current research interest is surrounding the synthesis and nanomechanics of atomically thin materials such as graphene and transition metal dichalcogenides.

Sarah Colbert
9905 1093
Monash Centre for Atomically Thin Materials