Enhanced Magneto-Optical Activities of Modulated 
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 Multilayer Metamaterials

Tomita, Satoshi; Suwa, Tomomi; Riego, Patricia; Berger, Andreas; Hosoito, Nobuyoshi; Yanagi, Hisao

doi:10.1103/physrevapplied.11.064010

Cited by 3 publications

(2 citation statements)

References 63 publications

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“…Superlattices with a stacking sequence of ferromagneticmetal and noble-metal have been intensively studied for application to information storage technologies, for example, magnetic recording media, 1,2) magnetic random access memories, 3) and magneto-optical media. 4,5) These applications are relevant to superlattice's perpendicular magnetic anisotropy, which is caused by strong spin-orbit interaction in the noble-metal layers. 6,7) The spin-orbit interaction in magnetic superlattices is of great interest also from the viewpoint of time-varying magnetic 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%

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

Tomita

Kikuchi

Okamoto

2022

Jpn. J. Appl. Phys.

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“…Nanoscale metallic multilayered nanofilms have unique physical properties, especially when the periodic thickness (2 h ) decreases to the nanometer scale. − This is because the microstructure of the multilayered nanofilms is much different from that of the corresponding bulk material, although they have the same material composition. This makes multilayered nanofilms an interesting nanomaterial for a multitude of applications, such as magnetic recording media, , radiation-tolerant nuclear material, ,, interfacial thermal resistance material, , corrosion resistance material, , and wear resistance material . Recently, there has been a strong interest in understanding the pronounced interfacial effects of heat transport processes in multilayers for their thermoelectric, − thermionic, , and thermomagnetic applications, as well as thermal stability .…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity, Electrical Resistivity, and Microstructure of Cu/W Multilayered Nanofilms

Dong

Guo

Cheng

et al. 2020

ACS Appl. Mater. Interfaces

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Metallic multilayered nanofilms have been extensively studied owing to their unique physical properties and applications. However, studies on the thermal conductivity and electrical resistivity of metallic multilayered nanofilms, as their important physical properties, are seldom reported. In this work, Cu/W multilayered nanofilms with periodic thickness varying from 6 to 150 nm were deposited by magnetron sputtering. The resistivities of the Cu/W multilayered nanofilms increase with the decrease of periodic thickness, especially when the periodic thickness is smaller than 37 nm. The resistivities of the multilayered nanofilms fit well with the Fuchs–Sondheimer and Mayadas–Shatzkes (FS–MS) model, which considers both interface scattering and grain boundary scattering. The thermal conductivities of the Cu/W multilayered nanofilms were measured by the three-omega (3ω) method, which decrease with a decrease of periodic thickness initially and increase at the smallest periodic thickness of 6 nm. The Boltzmann transport equation (BTE)-based model was used, to explain the periodic thickness-dependent thermal conductivity of metallic multilayered nanofilms by considering the contributions from both phonon and electron heat transport processes, where the calculated thermal conductivities agree well with the measured ones. The electrical resistivity and thermal conductivity strongly depend on the microstructures of the multilayered nanofilms.

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Dependence of the magneto-optical signal on the Co layer thickness asymmetry in Co/Pt/Co films

et al. 2020

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Enhanced Magneto-Optical Activities of Modulated Fe - Pt Multilayer Metamaterials

Cited by 3 publications

References 63 publications

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

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

Thermal Conductivity, Electrical Resistivity, and Microstructure of Cu/W Multilayered Nanofilms

Dependence of the magneto-optical signal on the Co layer thickness asymmetry in Co/Pt/Co films

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