Modulating above-room-temperature magnetism in Ga-implanted Fe5GeTe2 van der Waals magnets

Yanan Yuan, Daxiang Liu, Jingjing Yu, Guanhua Zhang, Xiang Chen, Ruiqi Liu, Siyu Wang, Fangfang Pei, Long Wei, Zhi Li, Junming Guo, Shouguo Wang, Zhaoliang Liao, Wensheng Yan, Z. Q. Qiu, M. Yang, Qian Li

Research output: Contribution to journalArticlepeer-review


The creation of van der Waals (vdW) ferromagnets with tunable Curie temperature (TC) and magnetic anisotropy is essential in developing vdW magnet-based devices. Here, we report an effective and reliable method for modulating the magnetic properties of vdW Fe5GeTe2 by site-specific Ga+ implantation. In this study, we report an easy axis in the ab-plane for bulk Fe5GeTe2 (TC = 310 K) and an axis out of the plane for thin Fe5GeTe2 flakes (TC = 290 K). Combining element-resolved photoemission electron microscopy and spatially resolved magneto-optic Kerr microscopy, we find that the implantation of a tiny amount of 10−3 Ga+·Å−3 in Fe5GeTe2 greatly enhances the TC from 290 to 360 K and switches the magnetic easy axis from the out-of-plane c axis to the ab-plane. The room-temperature x-ray magnetic circular dichroism signal is enhanced from 0% to 9% at an implantation level of 10−2 Ga+·Å−3. These results provide new opportunities for tailoring the magnetic properties of vdW materials beyond room temperature.
Original languageEnglish (US)
Issue number9
StatePublished - Sep 1 2023
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2023-09-15
Acknowledged KAUST grant number(s): ORA-CRG10-2021-4665
Acknowledgements: The project was primarily supported by the Fundamental Research Funds for the Central Universities (Grant No. wk2310000104), the USTC Research Funds of the Double First-Class Initiative (Grant No. YD2140002004), the National Natural Science Foundation of China (Grant Nos. 12174364, 12104003, and 12241406), Users with Excellence Program of Hefei Science Center CAS (Grant No. 2021HSC-UE003), and Open Funds of Hefei National Research Center for Physical Sciences at the Microscale (Grant No. KF2021001). This work was partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication. Z.Q.Q. acknowledges the support of the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05CH11231 (van der Waals heterostructures program, KCWF16), Future Materials Discovery Program through the National Research Foundation of Korea (Grant No. 2015M3D1A1070467), Science Research Center Program through the National Research Foundation of Korea (Grant No. 2015R1A5A1009962), and the King Abdullah University of Science and Technology (KAUST) under Award No. ORA-CRG10-2021-4665. The PEEM measurement was performed at the XPEEM endstation at BL09U Dreamline at Shanghai Synchrotron Radiation Facility (SSRF). This research used resources of Beamlines XMCD-A and XMCD-B (Soochow Beamline for Energy Materials) at NSRL.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • General Engineering
  • General Materials Science


Dive into the research topics of 'Modulating above-room-temperature magnetism in Ga-implanted Fe5GeTe2 van der Waals magnets'. Together they form a unique fingerprint.

Cite this