Broadband and high-sensitivity permeability measurements on a single magnetic particle by transformer coupled permeameter

Tamaru, Shingo; Kikuchi, Nobuaki; Igarashi, Toshiyuki; Okamoto, Satoshi; Kubota, Hitoshi; Yoshida, Shizuo

doi:10.1016/j.jmmm.2020.166434

Cited by 7 publications

(1 citation statement)

References 19 publications

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“…The μ of magnetic materials is changed at the vicinity of magnetic resonance frequencies determined by g-value and external/internal magnetic fields. 20) Internal magnetic fields can be modulated using spin Hall effects in noble-metal layers with strong spin-orbit interaction in magnetic superlattices. Because the modulation strength of μ is relevant to magnetic resonance linewidth, mainly expressed by the Gilbert damping parameter α, 21,22) the control of α is crucial for realizing time-varying μ in magnetic superlattice metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Co-planar waveguide ferromagnetic resonance spectroscopy of cobalt/platinum superlattice metamaterials

Tomita

Kikuchi

Okamoto

2022

Jpn. J. Appl. Phys.

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We study cobalt/platinum (Co/Pt) superlattices by means of the ferromagnetic resonance spectroscopy in the frequency domain. The magnetization easy-axis of superlattices, which lies in a plane of the film with Co layers of 1.5 and 1.2 nm thickness, changes to the direction perpendicular to the film surface with Co layers of 0.9 and 0.6 nm thickness. As the Co layer thickness decreases from 0.9 to 0.6 nm, the Gilbert damping parameter significantly increases while the $g$-value is almost constant. As the Pt layer thickness decreases from 0.6 to 0.3 nm in the superlattices with 0.9 nm thick Co layers, the damping parameter slightly decreases. The present study demonstrates that the Co/Pt superlattices with 0.9 nm thick Co layers and 0.3 nm thick Pt layers are suitable for time-varying magnetic metamaterials realizing a larger magnetic permeability modulation.

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Section: Introductionmentioning

confidence: 99%