Improvement of high-frequency properties of Co2FeSi Heusler films by ultrathin Ru underlayer

doi:10.1088/1674-1056/ab7802

中国物理B ›› 2020, Vol. 29 ›› Issue (4): 46202-046202.doi: 10.1088/1674-1056/ab7802

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Improvement of high-frequency properties of Co₂FeSi Heusler films by ultrathin Ru underlayer

Cuiling Wang(王翠玲), Shouheng Zhang(张守珩), Shandong Li(李山东), Honglei Du(杜洪磊), Guoxia Zhao(赵国霞), Derang Cao(曹德让)

1 College of Physics, Center for Marine Observation and Communication, Qingdao University, Qingdao 266071, China;
2 College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266510, China;
3 School of Physics, Shandong University, Jinan 250100, China

收稿日期:2019-12-16 修回日期:2020-02-17 出版日期:2020-04-05 发布日期:2020-04-05
通讯作者: Shandong Li E-mail:lishd@qdu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11674187 and 51871127) and the Fund from the Technology on Electronic Test & Measurement Laboratory (Grant No. 6142001180103).

Improvement of high-frequency properties of Co₂FeSi Heusler films by ultrathin Ru underlayer

Cuiling Wang(王翠玲)^1,2, Shouheng Zhang(张守珩)¹, Shandong Li(李山东)¹, Honglei Du(杜洪磊)^1,3, Guoxia Zhao(赵国霞)¹, Derang Cao(曹德让)¹

1 College of Physics, Center for Marine Observation and Communication, Qingdao University, Qingdao 266071, China;
2 College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266510, China;
3 School of Physics, Shandong University, Jinan 250100, China

Received:2019-12-16 Revised:2020-02-17 Online:2020-04-05 Published:2020-04-05
Contact: Shandong Li E-mail:lishd@qdu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11674187 and 51871127) and the Fund from the Technology on Electronic Test & Measurement Laboratory (Grant No. 6142001180103).

摘要/Abstract

摘要： Heusler Co₂FeSi films with a uniaxial magnetic anisotropy and high ferromagnetic resonance frequency f_r were deposited by an oblique sputtering technique on Ru underlayers with various thicknesses t_Ru from 0 nm to 5 nm. It is revealed that the Ru underlayers reduce the grain size of Co₂FeSi, dramatically enhance the magnetic anisotropy field H_K induced by the internal stress from 242 Oe (1 Oe=79.5775 A·m^-1) to 582 Oe with an increment ratio of 2.4, while a low damping coefficient remains. The result of damping implies that the continuous interface between Ru and Co₂FeSi induces a large in-plane anisotropic field without introducing additional external damping. As a result, excellent high-frequency soft magnetic properties with f_r up to 6.69 GHz are achieved.

关键词: oblique sputtering, ferromagnetic resonance, Ru underlayer, Heusler thin film

Abstract: Heusler Co₂FeSi films with a uniaxial magnetic anisotropy and high ferromagnetic resonance frequency f_r were deposited by an oblique sputtering technique on Ru underlayers with various thicknesses t_Ru from 0 nm to 5 nm. It is revealed that the Ru underlayers reduce the grain size of Co₂FeSi, dramatically enhance the magnetic anisotropy field H_K induced by the internal stress from 242 Oe (1 Oe=79.5775 A·m^-1) to 582 Oe with an increment ratio of 2.4, while a low damping coefficient remains. The result of damping implies that the continuous interface between Ru and Co₂FeSi induces a large in-plane anisotropic field without introducing additional external damping. As a result, excellent high-frequency soft magnetic properties with f_r up to 6.69 GHz are achieved.

Key words: oblique sputtering, ferromagnetic resonance, Ru underlayer, Heusler thin film

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)

王翠玲, 张守珩, 李山东, 杜洪磊, 赵国霞, 曹德让. Improvement of high-frequency properties of Co₂FeSi Heusler films by ultrathin Ru underlayer[J]. 中国物理B, 2020, 29(4): 46202-046202.

Cuiling Wang(王翠玲), Shouheng Zhang(张守珩), Shandong Li(李山东), Honglei Du(杜洪磊), Guoxia Zhao(赵国霞), Derang Cao(曹德让). Improvement of high-frequency properties of Co₂FeSi Heusler films by ultrathin Ru underlayer[J]. Chin. Phys. B, 2020, 29(4): 46202-046202.

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Improvement of high-frequency properties of Co₂FeSi Heusler films by ultrathin Ru underlayer

Improvement of high-frequency properties of Co₂FeSi Heusler films by ultrathin Ru underlayer

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