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In Memory of Prof. Jiunn Chen

It is with deep sorrow that we mourn the passing of our esteemed collaborator, Prof. Jiunn Chen. His invaluable contributions to the theoretical calculations of magnetic circular dichroism(MCD) in ferrimagnetic systems have significantly advanced our understanding of this field. His dedication, insightful discussions, and unwavering passion for scientific research will always be remembered.

Prof. Chen's work has left a lasting impact on our studies, and his legacy will continue to inspire future research. We extend our heartfelt condolences to his family, colleagues, and all who had the privilege of working with him.

In honor of his contributions, we recognize the following collaborative works that reflect his profound influence on spin-dependent optical transitions, magneto-optical effects, and ferrimagnetic systems:

Spin-dependent optical charge transfer in magnetite from transmitting optical magnetic circular dichroism
Physical Review B 98, 085141 (2018)
Magnetic enhancement of carbon-encapsulated magnetite nanoparticles
Journal of Alloys and Compounds 790, 716 (2019)
Spin-dependent optical transitions in yttrium iron garnet
Materials Research Express 8 (2), 026101 (2021)
Manipulation of energy-resolved magneto-optical effect in yttrium iron garnet films achieved by covering with nonmagnetic metals
Chinese Journal of Physics 90, 717 (2024)
Volatile and Non‐Volatile Dual‐Function Electrically Controlled Ultraviolet Magneto‐Optical Effect in TmIG/Pt
Advanced Electronic Materials, 2400459 (2024)

These publications serve as a testament to Prof. Jiunn Chen’s scholarly excellence and dedication to advancing magneto-optical science. His contributions will continue to inspire and guide researchers in this field for years to come.

The Magneto-Opto-Electronics group (Principal Investigator: Prof. Hua-Shu Hsu (許華書)) is a research group in the Department of Applied Physics at the National Pingtung University, Taiwan. Our research focuses on the development and physical characterization of new functional materials with novel spin-polarized band structures that induce desirable photophysical properties, especially for magneto-optical effects, such as magneto-absorption and magnetic circular dichroism (MCD) for magneto-optoelectronics applications.

In those fields, the group has made contributions to:

1) MCD manipulation, for instance, using spin-polarized current or by charge accumulation.

Carbon, 140, 10 (2018); https://doi.org/10.1016/j.carbon.2018.08.030
Physica Status Solidi (RRL)–Rapid Research Letters, 14, 2000223 (2020); https://doi.org/10.1002/pssr.202000223
Applied Physics Letters, 118, 032408 (2021); https://doi.org/10.1063/5.0038347
Adv. Electron. Mater., 2400459 (2024); https://doi.org/10.1002/aelm.202400459
ACS Appl. Electron. Mater. 7, 1, 177–184 (2025); https://doi.org/10.1021/acsaelm.4c01642

2) Engineering spin-polarized band for magneto-optoelectronics and spintronics application.

Carbon, 114, 642-648, (2017); https://doi.org/10.1016/j.carbon.2016.12.060
Applied Physics Letters, 110, 242404 (2017); https://doi.org/10.1063/1.4986462
Applied Surface Science, 492, 591 (2019); https://doi.org/10.1016/j.apsusc.2019.06.225
Global Challenges, 4, 2000025 (2020); https://doi.org/10.1002/gch2.202000025
ACS Appl. Mater. Interfaces, 13, 10279 (2021); https://dx.doi.org/10.1021/acsami.0c20863
ACS Appl. Mater. Interfaces, 13, 23173 (2021); https://doi.org/10.1021/acsami.1c03397
ACS Appl. Mater. Interfaces, (2022); https://doi.org/10.1021/acsami.1c23505
Chin. J. Phys., 90, 717 (2024); https://doi.org/10.1016/j.cjph.2024.04.027
Phys. Rev. Applied 24, 034052 (2025); https://doi.org/10.1103/h822-rw47

3) Extraction MCD effects from a blended mixture of magnetic linear dichroism signals in the magnetic material/polymer hybrid systems.

Scientific Reports, 9, 17192 (2019); https://doi.org/10.1038/s41598-019-53880-1

In the News: Congratulations on the publication. We demonstrate that Co₂MnGa thin films exhibit giant, temperature-independent ultraviolet magnetic circular dichroism (MCD) arising from Co–Mn 3d hybridization, and proposes general rules for discovering other magnetic materials with large MCD. with Dr.Yao Zhang and Prof. Simon Granville (Victoria University of Wellington, New Zealand ) entitled “Giant temperature-independent ultraviolet circular dichroism in Co2⁢Mn⁢𝑋 (𝑋 =Ga,Ge) Heusler magnetic thin films” by Phys. Rev. Applied 24, 034052 (2025) (https://doi.org/10.1103/h822-rw47)

Publication Date:September 19, 2025

In the News: Congratulations on the publication collaborated with Dr. Pei-Yu Chuang (NCKU), Prof. Jung-Chun-Andrew Huang (NCKU), Dr. Ashish Atma Chainani (NSRRC) entitled “An “s-Electron” Donor Band Driven Metallic Ferromagnetism in Co-Doped ZnO Films” by the Advanced Science (2025).We use polarization-dependent HAXPES on Co-doped ZnO films and identify a weak Fermi-level–crossing donor band with clear s-character.

(https://doi.org/10.1002/advs.202508148)

Publication Date: July 26, 2025

In the News: Congratulations on the publication of our chirality induced-spin polarized catalyst work collaborated with Prof. Chun-Wei Chen (NTU) entitled “Chirality-Regulated Spin-Polarization of Perovskite Nanoplates for Photocatalytic CO2 Reduction Reaction” by the Journal of the American Chemical Society (2025)

(https://doi.org/10.1021/jacs.5c11357)

Publication Date: August 19, 2025

In the News: Congratulations on the publication. By utilizing Joule heating induced by electrical current, we achieve dynamic control of multilevel optical ellipticity by switching the spin orientation in ferrimagnetic GdFeCo alloys collaborated with Prof. Stéphane Mangin ( Institut Jean Lamour / Universite de Lorraine, France) entitled “Electrically Modulated Multilevel Optical Chirality in GdFeCo Thin Films” by ACS Appl. Electron. Mater., 7, 1, 177–184 (2025) (https://doi.org/10.1021/acsaelm.4c01642)

Publication Date: December 16, 2024

In the News: Congratulations on the publication of our interface-driven magnetic optical (MO) manipulation on Pt/YIG and Cu/YIG collaborated with and Prof. Stéphane Mangin (IJL) and Prof. Jiunn Chen (NPTU) entitled “Manipulation of energy-resolved magneto–optical effect in yttrium iron garnet films achieved by covering with nonmagnetic metals.” by Chin. J. Phys., 90, 717 (2024)(https://doi.org/10.1016/j.cjph.2024.04.027).This capability opens opportunities to manipulate and customize the magneto–optical effect with energy resolution for various applications in magneto-optics.

Publication Date: August 01, 2024

In the News: Congratulations on the publication of our dynamic control of the magneto‐optical properties in TmIG/Pt by employing electrical current modulation, particularly within the UV spectrum. collaborated with Prof. Simon Granville (VUW) and Prof. Jiunn Chen (NPTU) entitled “Volatile and Non‐Volatile Dual‐Function Electrically Controlled Ultraviolet Magneto‐Optical Effect in TmIG/Pt.” by Adv. Electron. Mater., 2400459 (2024) (https://doi.org/10.1002/aelm.202400459).This discovery opens the path for the development of dynamic, large-area, and ultrathin chiral optical devices using magnetic insulators.

Publication Date: July 29, 2024

In the News: With gratitude for the support from the NSTC, our Taiwan-Czech bilateral cooperation project "Spin polarized zinc oxide nanostructures" has been approved for a three-year term.(2024/01~2026/12) (Taiwan team: Prof. Hua Shu Shu (NPTU), Dr. Yen Fa Liao (NSRRC), Prof. Mei Yi Liao (NPTU), Prof. Chih-Chia Huang (NCKU); Czech team: Dr. Zdeněk Remeš (CAS), Prof. Bohuslav Rezek(CTU))

Publication Date: January 05, 2024

In the News: Grateful for the invitation to join as a member (from 2023) of the interdisciplinary research team at NCKU Center for Quantum Frontier of Research and Technology (QFort)!

https://qfort.ncku.edu.tw/peoples

Publication Date: September 01, 2023

In the News: With gratitude for the support from the NSTC, our project "Energy Resolved Chirality-Induced Spin Selectivity and Magneto-Optical Manipulation" has been approved for a three-year term (2022/08~2025/07).

Publication Date: September 01, 2022

In the News: Congratulations on the publication of our spin polarized catalyst work collaborated with Prof. Chun-Wei Chen (NTU) entitled “Spin-Polarized Photocatalytic CO2 Reduction of Mn-Doped Perovskite Nanoplates” by the Journal of the American Chemical Society

(http://dx.doi.org/10.1021/jacs.2c06060 )

Publication Date: August 17, 2022

In the News: Congratulations on the publication of our work related to broadband CD manipulation via interaction among magnetoplasmons, excitons, and Co spins entitled “Field-Free Magnetoplasmon-Induced Ultraviolet Circular Dichroism Switching in Premagnetized Magnetic Nanowires” by the ACS Applied Materials & Interfaces.

(https://doi.org/10.1021/acsami.1c23505 )

Publication Date: February 2, 2022

In the News: Congratulations on the publication of our magneto-photodegradation work collaborated with Dr. Yen-Fa Liao (NSRRC) entitled “Enhanced Photodegradation in Metal Oxide Nanowires with Co-Doped Surfaces under a Low Magnetic Field” by the ACS Applied Materials & Interfaces.

(https://doi.org/10.1021/acsami.1c03397 )

Publication Date: May 6, 2021

In the News: Congratulations on the publication of our magneto-optical (MCD&FR) work collaborated with Prof. Chun-Wei Chen (NTU) entitled “Strong Excitonic Magneto-Optic Effects in Two-Dimensional Organic–Inorganic Hybrid Perovskites” by the ACS Applied Materials & Interfaces.

(https://dx.doi.org/10.1021/acsami.0c20863 )

Publication Date: February 18, 2021

In the News: Congratulations on the publication of our operando electrochemical MCD work collaborated with Prof. Minn-Tsong Lin (NTU) entitled “Tunable magnetic circular dichroism via electrochemically controlled charge-transfer transition in Ru(bpy)32+ aqueous solution” by the Applied Physics Letters.

(doi.org/10.1063/5.0038347)

Publication Date: January 22, 2021

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