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Ru thickness-dependent interlayer coupling and ultrahigh FMR frequency in FeCoB/Ru/FeCoB sandwich trilayers |
| Le Wang(王乐)1,2,†, Zhao-Xuan Jing(荆照轩)1,2,†, Ao-Ran Zhou(周傲然)1,†, and Shan-Dong Li(李山东)1,2,‡ |
1 College of Physics, Qingdao University, Qingdao 266071, China;
2 College of Electronics and Information, Qingdao University, Qingdao 266071, China |
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Abstract The antiferromagnetic (AFM) interlayer coupling effective field in a ferromagnetic/non-magnetic/ferromagnetic (FM/NM/FM) sandwich structure, as a driving force, can dramatically enhance the ferromagnetic resonance (FMR) frequency. Changing the non-magnetic spacer thickness is an effective way to control the interlayer coupling type and intensity, as well as the FMR frequency. In this study, FeCoB/Ru/FeCoB sandwich trilayers with Ru thickness ($t_{\rm Ru}$) ranging from 1 Å to 16 Å are prepared by a compositional gradient sputtering (CGS) method. It is revealed that a stress-induced anisotropy is present in the FeCoB films due to the B composition gradient in the samples. A $t_{\mathrm{Ru}}$-dependent oscillation of interlayer coupling from FM to AFM with two periods is observed. An AFM coupling occurs in a range of $2 {\rm Å} \le t_{\rm Ru} \le 8 {\rm Å}$ and over 16 $\mathrm{Å}$, while an FM coupling is present in a range of $t_{\rm Ru}< 2$ Å and $9 {\rm Å} \le t_{\rm Ru} \le 14.5 Å$. It is interesting that an ultrahigh optical mode (OM) FMR frequency in excess of 20 GHz is obtained in the sample with ${t}_{\mathrm{Ru}}= 2.5 \mathrm{Å}$ under an AFM coupling. The dynamic coupling mechanism in trilayers is simulated, and the corresponding coupling types at different values of $t_{\mathrm{Ru}}$ are verified by Layadi's rigid model. This study provides a controllable way to prepare and investigate the ultrahigh FMR films.
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Received: 11 March 2022
Revised: 15 April 2022
Accepted manuscript online: 22 April 2022
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PACS:
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62.25.Fg
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(High-frequency properties, responses to resonant or transient (time-dependent) fields)
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75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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75.30.Gw
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(Magnetic anisotropy)
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71.55.Ak
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(Metals, semimetals, and alloys)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51871127 and 11674187). |
Corresponding Authors:
Shan-Dong Li
E-mail: lishd@qdu.edu.cn
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Cite this article:
Le Wang(王乐), Zhao-Xuan Jing(荆照轩), Ao-Ran Zhou(周傲然), and Shan-Dong Li(李山东) Ru thickness-dependent interlayer coupling and ultrahigh FMR frequency in FeCoB/Ru/FeCoB sandwich trilayers 2022 Chin. Phys. B 31 086201
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