| INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Interfacial DMI in Fe/Pt thin films grown on different buffer layers |
| Wen-Jun Zhang(张文君)1, Fei Wei(魏菲)2, Bing Liu(刘冰)1, Yang Zhou(周阳)2, Shi-Shou Kang(康仕寿)2,†, and Bing Sun(孙兵)1,‡ |
1 School of Physics and Electronic Information, Weifang University, Weifang 261061, China;
2 School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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Abstract We study the interfacial Dzyaloshinskii—Moriya interactions (i-DMI) of Fe/Pt bilayers grown on Si substrates with MgO, SiO2, or Ta each as a buffer layer on the basis of wave-vector-resolved Brillouin light scattering (BLS) measurement. The obtained i-DMI energy values for Fe/Pt on MgO, Ta, and SiO2 buffer layers are 0.359, 0.321, and 0.274 mJ/m2, respectively. The large i-DMI value observed in Fe/Pt system on the MgO buffer layer can be attributed to the good interfacial quality and the Rshaba effect at the MgO/Fe interface. Moreover, the MgO/Fe/Pt system, benefiting from better sample quality, exhibits a lower damping factor. Furthermore, layer-resolved first-principles calculations are carried out to gain a more in-depth understanding of the origin of the i-DMI in the Fe/Pt system. The results indicate that in the Fe(110)/Pt(111) system, the substantial DMI energy between Fe spins at the interface is related to a significant change in spin—orbit coupling (SOC) energy in the neighboring Pt layer. In contrast, for the MgO(002)/Fe(002) system, both the DMI and its related SOC energy are concentrated at the interfacial Fe layer. Our investigation will provide a valuable insight into the spintronic community in exploring novel devices with chirality dependence.
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Received: 12 October 2023
Revised: 30 December 2023
Accepted manuscript online: 05 January 2024
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PACS:
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75.40.Gb
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(Dynamic properties?)
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85.75.-d
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(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
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| Fund: Project supported by the National Basic Research Program of China (Grant Nos. 12074220, 12304151, 12204355, and 12204356) and the Natural Science Foundation of Shandong Province, China (Grant No. ZR2022QA085). |
Corresponding Authors:
Shi-Shou Kang, Bing Sun
E-mail: skang@sdu.edu.cn;wywdsunbing@wfu.edu.cn
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Cite this article:
Wen-Jun Zhang(张文君), Fei Wei(魏菲), Bing Liu(刘冰), Yang Zhou(周阳), Shi-Shou Kang(康仕寿), and Bing Sun(孙兵) Interfacial DMI in Fe/Pt thin films grown on different buffer layers 2024 Chin. Phys. B 33 048501
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