Giant Magnetization Enhancement at the Ultrathin Limit of an Orthoferrite
ABSTRACT Low‐dimensional magnetic systems have received significant interest due to their high scalability and energy efficiency for future electromagnetic applications. However, low‐dimensional magnetism at finite temperature is subject to Mermin–Wagner fluctuations, which make its realization highly challenging. Here, we propose structural modulation in the thin‐film structure of an orthoferrite system to achieve a high low‐dimensional magnetic response at room temperature. ErFeO 3 epitaxial thin film with atomically precise thickness control demonstrates that the magnetic response at 300 K can be significantly enhanced compared to its bulk counterpart. The magnetic response reaches its maximum value of 3.7 µ B /f.u. for the 2 nm‐thick epitaxial film. The characteristic domain structure resulting from epitaxial strain and orbital reconstruction at the surface, both arising from the thin film geometry, has been proposed as the microscopic origin of the giant magnetization enhancement. We show that magnetic ordering can indeed be realized in the 2D limit, with deliberate structural control of orthoferrite systems.
Authors
- Heemin Lee (ORCID: https://orcid.org/0000-0002-8727-210X)
- Heung‐Sik Kim (ORCID: https://orcid.org/0000-0003-0691-7605)
- Seung Gyo Jeong (ORCID: https://orcid.org/0000-0002-2504-3571)
- Woo‐Suk Noh (ORCID: https://orcid.org/0000-0002-3313-6559)
- J OH (ORCID: https://orcid.org/0009-0009-1556-3272)
- Yeonkyu Lee (ORCID: https://orcid.org/0000-0002-5142-7077)
- Woo Seok Choi (ORCID: https://orcid.org/0000-0002-2872-6191)
- Jun‐Sik Lee (ORCID: https://orcid.org/0000-0003-0181-9352)
- Cheng‐Tai Kuo (ORCID: https://orcid.org/0000-0001-7721-6481)
- Sehwan Song (ORCID: https://orcid.org/0000-0002-0398-6261)
- Si Won Kim
- Chanyoung Lee (ORCID: https://orcid.org/0009-0002-7923-5832)
- Sungkyun Park (ORCID: https://orcid.org/0000-0003-1816-310X)
- S. Choi
- Sang Ho Oh (ORCID: https://orcid.org/0000-0001-5808-7821)
- Valeria Lauter (ORCID: https://orcid.org/0000-0003-0989-6563)
- Jeehoon Kim (ORCID: https://orcid.org/0000-0002-4613-0017)
- Yaolong Xing
- Hong Hyun Jeon
- Seyoung Kwon
- Jaeha Choi
Institutions
- Pohang University of Science and Technology (KR)
- Oak Ridge National Laboratory (US)
- Kangwon National University (KR)
- SLAC National Accelerator Laboratory (US)
- Korea Energy Economics Institute (KR)
- Korea Institute of Energy Research (KR)
- Korea Foundation for Max Planck POSTECH (KR)
- Pusan National University (KR)
- Sungkyunkwan University (KR)
Publication Details
- Journal
- Advanced Functional Materials
- Published
- 2026-09-16
- DOI
- https://doi.org/10.1002/adfm.78476
- Primary Topic
- Multiferroics and related materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- U.S. Department of Energy
- National Research Foundation
- Pohang University of Science and Technology
- National Research Foundation of Korea
- Ministry of Education, Science and Technology
- Ministry of Science and ICT, South Korea
- Office of Science
- Basic Energy Sciences
- Oak Ridge National Laboratory
- SLAC National Accelerator Laboratory