Event
Proposal Exam: Shanchuan Liang
Tuesday, November 19, 2024
10:00 a.m.
A.V.W. Room 2328
Maria Hoo
301 405 3681
mch@umd.edu
ANNOUNCEMENT: Ph.D. Research Proposal Exam
Name: Shanchuan Liang
Committee:
Professor Cheng Gong (Chair)
Professor Kevin M. Daniels
Professor Carlos A. Rios Ocampo
Date/time: Tuesday, November 19, 2024 at 10:00 am EST
Location: A.V.W. Room 2328
Title: Multiferroic control of two-dimensional magnets
Abstract: Magnetism, one of the most fundamental quantum phenomena, has revolutionized technologies such as data storage and biomedical imaging, and continues to bring forth new phenomena in emerging materials with reduced dimensionalities. The emergence of two-dimensional (2D) magnets provides an ideal platform for investigating unique magnetoelectric and magneto-optical phenomena, owing to their atomic thinness and wide property tunability. Moreover, by eliminating lattice-matching constraints, 2D magnets facilitate compatibility between dissimilar material systems, thereby enhancing the potential for interplay between magnetic and other physical properties. However, despite these inherent advantages, the anticipated efficient control of 2D magnetism remains elusive.
This proposal aims to achieve efficient control of 2D magnetism through the strategic design of multiferroic heterostructures that integrate ferroelectric and ferromagnetic materials. In such multiferroic systems, we probe the magnetoelectric coupling effect by demonstrating reversible and non-volatile ferroelectric control of 2D magnetism. Specifically, a magnetic hysteresis loop can be opened and closed by applying an opposite-sign voltage of approximately 5 volts across the heterostructures. Notably, the control efficiency improves as the thickness of the 2D magnets decreases, underscoring the critical role of short-range interfacial coupling. Furthermore, the multiferroic heterostructures enable direct electrical toggling between distinct magnetization states. This work advances the development of functional quantum materials by enabling effective control of 2D magnetism, opening the door for tailored applications for future technologies, especially in the realm of energy-efficient spintronics.
