Dr. Ashwini Kumar
Luzhou Vocational and Technical College, China
Title: Advanced multifunctional multiferroic materials
Abstract:
Multiferroic materials are materials
that simultaneously exhibit more than one order, including magnetic,
electrical, and elastic order. Magnetic order is usually driven by exchange
interactions between magnetic dipoles, originating from unfilled electron
orbital shells. The electrical order is the result of the ordering of the local
electric dipoles. The elastic ordering is the result of the ordering of atomic
displacements due to strain. The simultaneous occurrence of magnetic and
electrical order is particularly interesting because it combines properties
that can be used for information storage, processing and transmission. It
allows magnetic and electric fields to interact with magnetic and electrical orders.
Multiferroic materials have potential applications in important devices such as
sensors and memory. Apart from BiFeO3, possess multiferroic above
room temperature, other compounds (such as TbMnO3, HoMnO3,
and RFeO3) that exist in nature or being synthesized exhibit
multiferroic properties at extremely low temperatures. Moreover, the small
magnetization and multiphase formation of BiFeO3 limit its use in practical applications.
Therefore, it is necessary to design other promising room-temperature
multiferroic materials, driven by both the desire to understand the mechanism
and the technological need for better materials.
In this talk, the concept of
multiferroic materials will be briefly introduced. We will explore important
physical properties of these materials and review phase diagrams. We will also
briefly discuss the advantages of multiferroics, recent advances in
multiferroic discovery, and the future of multiferroics.
Biography:
Dr. Ashwini Kumar, born in 1984.03, received his
Ph.D. degree in Physics from Devi Ahilya University Indore – India in 2014. Currently,
he is working as an Associate Professor at School of Electrical and Electronic
Engineering, Luzhou Vocational and Technical College, Luzhou – China and Lead
member of Luzhou Key Laboratory of Intelligent Control and Electronic Device
Application Technology. He was a postdoctoral fellow at Southeast University,
Nanjing (2015-2019) and worked in the field of multiferroic materials. He has
published more than 30 research papers in internationally renowned SCI journals,
as well as presented numerous papers at national and international conferences
and seminars. Dr. Kumar is a recipient of the Fellowship from Madhya Pradesh
Council of Science and Technology, Bhopal (India) for training of Young
Scientist in 2014, a Young Scientist Award in the International Scientist
Awards on Engineering, Science and Medicine by VDGOOD professional Association,
India and a Best Paper Award (first prize) by Luzhou Chemistry and Chemical
Society, Luzhou in 2021. He also served as Principal Investigator and presided over
several national, provincial and municipal-level research projects, such as
National Natural Science Foundation (NSFC) of the Foreign Youth Fund, Jiangsu province
Postdoctoral Research Fund, Luzhou municipal Science and Technology research
fund, and Central University Basic Innovative Research Funds, etc. His research interest focused on the
development and investigation of novel multifunctional materials, magnetoelectric
multiferroic, perovskites-structured materials, microwave dielectric ceramics,
ferroelectric, spinel ferrites, as well as oxide ceramics.