Exotic H-field induced multiferroic behaviors in spin-frustrated systems

Authors

Hung-Duen Yang ⋅ TW Department of Physics, National Sun Yat-sen University, Taiwan

Abstract

Multiferroics are defined to have at least two ferroic (such as ferroelectric, ferromagnetic, ferroelastic, and ferrotoroidic) orderings in unique materials. Not only fundamental understanding but the potential application for the multiferroics are significant in the current research fields of condensed matter physics. In this talk, I will first briefly introduce (1) What are multiferroics? (2) What are the types (type I and Type-II) of magnetoelectric multiferroics? (3) Why is there rare multiferroics material? (4) What are the motivations of our research?
Then, I will present our recent results related to the titled topics: (1) Magnetic-field-induced second magnetic ordering and peculiar ferroelectric polarization in L-type ferrimagnetic Fe₂(MoO₄)₃. (2) Magnetic-field-induced switchable polarization in spin-chain FePbBiO₄. (3) Spin-reorientation induced hidden electric polarization in non-centrosymmetric berlinite magnetic oxide α-FePO₄.
Final question, are those three categorized as type-III multiferroics left for audiences' discussion?

About the Speaker

Hung-Duen Yang, Department of Physics, National Sun Yat-sen University, Taiwan

Professor Hung-Duen YANG received his BS degree in physics from the National Taiwan Normal University, Taiwan, in 1978 and completed his Ph.D. in physics from Iowa State University, USA, in 1987. He has worked as an Associated, full and Chair Professor in Physics since 1987, then the Chairman of Physics, Dean of College of Science and the President of National Sun Yat-sen University (NSYSU). During the period of 2001−2017, he also intermittently served short-term administrative positions of Director General of the Division of Natural Sciences and Deputy Chairman of the National Science Council (NSC), and as the Minister of Science and Technology of Taiwan. Professor Yang's academic research is mainly focusing on low temperature condensed-matter experimental physics, in particular transport, thermal and high-pressure studies on novel superconductors, magnetic and quantum materials. He with his co-workers have published 270 peer-reviewed papers in scientific journals. Thus, he has been honored with the Outstanding Research Award from the NSC, Elected Fellow of the Taiwanese Physical Society, Teaching and Academic Award from the Ministry of Education and Metal of Brilliant Light of Executive Yuan, Taiwan.

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Issue

2025: Proceedings of the 43rd Samahang Pisika ng Pilipinas Physics Conference

Entangled!
25-28 June 2025, National Institute of Physics, University of the Philippines Diliman

Please visit the SPP2025 activity webpage for more information on this year's Physics Congress.

Article ID

SPP-2025-KA-01

Section

Keynote Address

Published

2025-06-23

How to Cite

[1]

H-D Yang, Exotic H-field induced multiferroic behaviors in spin-frustrated systems, Proceedings of the Samahang Pisika ng Pilipinas 43, SPP-2025-KA-01 (2025). URL: https://proceedings.spp-online.org/article/view/SPP-2025-KA-01.