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. 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. 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).

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摘要： Heusler Co2FeSi films with a uniaxial magnetic anisotropy and high ferromagnetic resonance frequency fr were deposited by an oblique sputtering technique on Ru underlayers with various thicknesses tRu 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 HK 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 fr 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 fr were deposited by an oblique sputtering technique on Ru underlayers with various thicknesses tRu 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 HK 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 fr 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)