Study of spin dynamics and damping on the magnetic nanowire arrays with various nanowire widths

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:409

Article

Cho, Jaehun¹  Fujii, Yuya²  Konioshi, Katsunori²  Yoon, Jungbum³  Kim, Nam-Hui¹  Jung, Jinyong¹  Miwa, Shinji²  Jung, Myung-Hwa⁴  Suzuki, Yoshishige²  You, Chun-Yeol¹ 

[1] Inha Univ, Dept Phys, Inchon 402751, South Korea

[2] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan

[3] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

[4] Sogang Univ, Dept Phys, Seoul 121742, South Korea

关键词: Nanowires;    Ferromagnetic resonance;    Micromagnetic simulations;    Gilbert damping;   

DOI  :  10.1016/j.jmmm.2016.02.090

来源: Elsevier

【 摘 要 】

We investigate the spin dynamics including Gilbert damping in the ferromagnetic nanowire arrays. We have measured the ferromagnetic resonance of ferromagnetic nanowire arrays using vector -network analyzer ferromagnetic resonance (VNA-FMR) and analyzed the results with the micromagnetic simulations. We find excellent agreement between the experimental VNA-FMR spectra and micromagnetic simulations result for various applied magnetic fields. We find that the same tendency of the demagnetization factor for longitudinal and transverse conditions, N-z (N-y) increases (decreases) as increasing the nanowire width in the micromagnetic simulations while N-x is almost zero value in transverse case. We also find that the Gilbert damping constant increases from 0.018 to 0.051 as the increasing nanowire width for the transverse case, while it is almost constant as 0.021 for the longitudinal case. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free