Magnetoimpedance effect in ferrimagnetic insulator yttrium iron garnet films capped by copper

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:480

Article

Correa, M. A.¹  Rosa, W. O.^2,3  Melo, A. S.¹  Silva, E. F.¹  Della Pace, R. D.¹  Oliveira, A. B.¹  Chesman, C.¹  Bohn, F.¹  Sommer, R. L.² 

[1] Univ Fed Rio Grande do Norte, Dept Fis, BR-59078900 Natal, RN, Brazil

[2] Ctr Brasileiro Pesquisas Fis, Rua Dr Xavier Sigaud 150, BR-22290180 Rio De Janeiro, RJ, Brazil

[3] Univ Granada, Av Fuente Nueva Sn, E-18071 Granada, Spain

关键词: Ferromagnetic films;    YIG;    Magnetization dynamics;    Magnetoimpedance effect;    Damping parameter;   

DOI  :  10.1016/j.jmmm.2019.02.051

来源: Elsevier

【 摘 要 】

We investigate the magnetization dynamics through magnetoimpedance effect in films of ferrimagnetic insulator yttrium iron garnet capped by copper. Thereby, we explore the magnetoimpedance in systems with magnetic insulators by varying the thickness of the magnetic material, and probe current frequency. We observe that the difference of electrical nature of the layers composing the films gives rise to the magnetoinductive effect in the whole frequency range, as well as favors the appearance of the ferromagnetic resonance effect even at low frequencies. We discuss the experimental results in terms of the structural features of the magnetic material, its magnetic properties, and the different mechanisms governing the magnetization dynamics. The results place the films of ferrimagnetic insulator yttrium iron garnet capped by copper exhibiting magnetoimpedance effect as very attractive candidates for application as probe element in magnetic sensors operating at low frequencies and with energy-efficient technologies. Further, we disclose an auspicious technique to look at the magnetization dynamics in magnetic materials and we provide a new perspective to solve questions related to the integration of insulator ferrimagnetic materials with the coplanar waveguide in broadband frequency applications.

【 授权许可】

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