Ru thickness-dependent interlayer coupling and ultrahigh FMR frequency in FeCoB/Ru/FeCoB sandwich trilayers

doi:10.1088/1674-1056/ac693f

中国物理B ›› 2022, Vol. 31 ›› Issue (8): 86201-086201.doi: 10.1088/1674-1056/ac693f

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

收稿日期:2022-03-11 修回日期:2022-04-15 接受日期:2022-04-22 出版日期:2022-07-18 发布日期:2022-08-02
通讯作者: Shan-Dong Li E-mail:lishd@qdu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51871127 and 11674187).

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

Received:2022-03-11 Revised:2022-04-15 Accepted:2022-04-22 Online:2022-07-18 Published:2022-08-02
Contact: Shan-Dong Li E-mail:lishd@qdu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51871127 and 11674187).

摘要/Abstract

摘要： 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.

关键词: interlayer exchange coupling, optical mode resonance, acoustic mode resonance, component gradient sputtering

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.

Key words: interlayer exchange coupling, optical mode resonance, acoustic mode resonance, component gradient sputtering

中图分类号: (High-frequency properties, responses to resonant or transient (time-dependent) fields)

62.25.Fg

75.70.-i (Magnetic properties of thin films, surfaces, and interfaces) 75.30.Gw (Magnetic anisotropy) 71.55.Ak (Metals, semimetals, and alloys)

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[J]. 中国物理B, 2022, 31(8): 86201-086201.

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Ru thickness-dependent interlayer coupling and ultrahigh FMR frequency in FeCoB/Ru/FeCoB sandwich trilayers

Ru thickness-dependent interlayer coupling and ultrahigh FMR frequency in FeCoB/Ru/FeCoB sandwich trilayers

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