Room Temperature Strong Orbital Moments in Perpendicularly Magnetized Magnetic Insulator

Page view(s)
11
Checked on Feb 02, 2025
Room Temperature Strong Orbital Moments in Perpendicularly Magnetized Magnetic Insulator
Title:
Room Temperature Strong Orbital Moments in Perpendicularly Magnetized Magnetic Insulator
Journal Title:
Advanced Functional Materials
Publication Date:
20 November 2024
Citation:
Omar, G. J., Gargiani, P., Valvidares, M., Lim, Z. S., Prakash, S., Suraj, T. S., Ghosh, A., Lim, S. T., Lourembam, J., & Ariando, A. (2024). Room temperature strong orbital moments in perpendicularly magnetized magnetic insulator. Advanced Functional Materials, 2414188. https://doi.org/10.1002/adfm.202414188
Abstract:
The balance between the orbital and spin magnetic moments in a magnetic system is the heart of many intriguing phenomena. Here, experimental evidence of a large orbital moment is shown, which competes with its spin counterpart in a ferrimagnetic insulator thulium iron garnet, Tm3Fe5O12. Leveraging element-specific X-ray magnetic circular dichroism (XMCD), it is established that the dominant contribution to the orbital moment originates from 4f orbitals of Tm. Besides the large Tm orbital moment, intriguingly, the results also reveal a smaller but evident non-zero XMCD signal in the O K edge, suggesting additional spin-orbit coupling and exchange interactions with the nearest neighbor Fe atoms. The unquenched orbital moment is primarily responsible for a significant reduction in g-factor, typically 2 in transition metals, as determined independently using ferromagnetic resonance spectroscopy. The findings reveal a non-linear reduction in the g-factor from 1.7 at 300 K to 1.56 at 200 K in Tm3Fe5O12 thin films. These results provide critical insights into the role of the f orbitals in long-range magnetic order and stimulate further exploration in orbitronics.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - A*STAR SpOTLITE programme
Grant Reference no. : A18A6b0057

This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - Advanced Manufacturing and Engineering (AME) Individual Research Grant (IRG)
Grant Reference no. : A2083c0054

This research / project is supported by the National Research Foundation of Singapore (NRF) - National Research Foundation of Singapore - Israel Science Foundation (NRF-ISF) joint program
Grant Reference no. : NRF2020-NRFISF004-3518
Description:
This is the peer reviewed version of the following article: Omar, G. J., Gargiani, P., Valvidares, M., Lim, Z. S., Prakash, S., Suraj, T. S., Ghosh, A., Lim, S. T., Lourembam, J., & Ariando, A. (2024). Room temperature strong orbital moments in perpendicularly magnetized magnetic insulator. Advanced Functional Materials, 2414188. https://doi.org/10.1002/adfm.202414188, which has been published in final form at https://doi.org/10.1002/adfm.202414188. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
ISSN:
1616-3028
Files uploaded:

File Size Format Action
tmig-manuscript-afm.pdf 2.36 MB PDF Request a copy