Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00192 : Synchrotron Radiation Soft X-ray Spectroscopy Study of the Magnetic Anisotropy Transition in Mn3-xCoxGa Heusler Films*
Presenter:
Jeongsoo Kang
(The Catholic University of Korea)
Authors:
Jeongsoo Kang
(The Catholic University of Korea)
Seungho Seong
(The Catholic Univ of Korea)
Geum Ha Lim
(The Catholic University of Korea)
Woosuk Yoo
(Sogang University)
Myung-Hwa Jung
(Sogang University)
Sang Wook Han
(University of Ulsan)
In this work, we have investigated the electronic structures and spin configurations of Mn3-xCoxGa Heusler films by employing synchrotron-radiation-excited soft X-ray spectroscopies, such as soft X-ray absorption spectroscopy (XAS) and soft X-ray magnetic circular dichroism (XMCD). Co 2p XAS and XMCD measurements show that the substituted Co ions in Mn3-xCoxGa consist of ferromagnetic metallic Co clusters and divalent Co ions with disordered magnetic moments. Mn 2p XAS and XMCD measurements show that Mn ions at both the octahedral and tetrahedral sites are nearly divalent, and that the magnetic moments of Mn ions are polarized along the ordered magnetic moments of the substituted Co ions. Angle-dependent Co 2p XMCD results for Mn3-xCoxGa support the weak PMA-to-IMA magnetic anisotropy transition with increasing x (x: Co concentration). This work shows that the magnetic anisotropy transition in Mn3-xCoxGa is determined mainly by the ferromagnetic metallic Co clusters of the substituted Co ions.
[1] R. A. de Groot, et al., Phys. Rev. Lett. 50, 2024 (1983).
[2] S. Chadov, et al., Nature Mater. 9, 541) (2010).
[3] H. Kurt, et al., Phys. Rev. B 83, 020405(R) (2011).
[4] Kyujoon Lee, et al., J. Alloys Compd. 858, 1582884 (2021).
*The financial funding by the NRF of Korea (Project No. 2019R1A2C1004929) is gratefully acknowledged.
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