Polarization transformation and destructive interference on subwavelength magnetic domains in magneto-plasmonic systems

Yamane, Haruki; Yanase, Satoshi; Hasegawa, Takashi; Kobayashi, Masanobu; Yasukawa, Yukiko

doi:10.1038/s41598-022-17971-w

Cited by 2 publications

(1 citation statement)

References 45 publications

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“…For instance, ferromagnetic chemically ordered L1 0 -CoPt thin films are promising candidate materials for magnetic tunnel junctions [1,2], high-density hard disk drives [3], nanoscaled permanent magnets [4], and exchange-coupled composites [5,6]. In particular, recent studies of CoPt alloys are devoted to their application as spin valves and transistors [7][8][9][10], spin orbit torque devices [11], investigation of magneto-plasmonic phenomena [12,13], and skyrmions formation [14]. In addition to chemically ordered CoPt alloys, their chemically disordered counterparts (i.e.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature diffusion in thin-film Pt-(Au-)-Co heterostructures: a structural and magnetic characterization

Pedan,

Makushko,

Yavorskyi

et al. 2024

Nanotechnology

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Formation of functional thin films for nanoelectronics and magnetic data storage via thermally induced diffusion-driven structural phase transformations in multilayer stacks is a promising technology-relevant approach. Ferromagnetic thin films based on CoPt alloys are considered as a material science platform for the development of various applications such as spin valves, spin orbit torque devices, and high-density data storage media. Here, we study diffusion processes in Pt-Co-based stacks with the focus on the effect of layers inversion (Pt/Co/substrate vs. Co/Pt/substrate) and insertion of an intermediate Au layer on the structural transitions and magnetic properties. We demonstrate that layer stacking has a pronounced effect on the diffusion rate at temperatures, where the diffusion is dominated by grain boundaries. We quantify effective diffusion coefficients, which characterize the diffusion rate of Co and Pt through the interface and grain boundaries, providing the possibility to control the homogenization rate of Pt-Co-based heterostructures. The obtained values are in the range of 10-16 – 10-13 cm2/s for temperatures of 150 °C – 350 °C. Heat treatment of thin-film samples results in the coercivity enhancement, which is attributed to short-range chemical ordering effects. We show that introducing an additional Au intermediate layer leads to an increase of the coercive field of the annealed samples due to a modification of exchange coupling between the magnetic grains at the grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Low-temperature diffusion in thin-film Pt-(Au-)-Co heterostructures: a structural and magnetic characterization

Pedan,

Makushko,

Yavorskyi

et al. 2024

Nanotechnology

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Magneto-optical efficiencies combined with surface-plasmon resonance in FeSi/Au system

Yasukawa,

Itoh,

Sugita

et al. 2024

APL Materials

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We designed and fabricated our original laminated materials that simultaneously exhibited different properties: magneto-optical (MO), i.e., the transverse MO Kerr effects (T-MOKE) and surface-plasmon resonance (SPR). The material design was composed of dielectric, magnetic, and noble-metal layers. We selected the soft-magnetic FeSi thin film as a T-MOKE magnetic layer, while an Au thin film was chosen as a SPR-source layer, creating an FeSi-/Au-based “MO-SPR material.” Strong interactions between T-MOKE and SPR were demonstrated. When the material is irradiated with a laser beam of wavelength 660 nm, at the SPR angle to the material, θR, the highest T-MOKE value was attained. The T-MOKE was markedly enhanced at θR: ∼32 to ∼84 times higher compared with the FeSi single layer (reference). The T-MOKE was amplified by a strong interaction between MO activities and electromagnetic field distributions. The FeSi (5.0 nm)/Au (14.8 nm) specimen achieved the best signal-to-noise ratio (SNR). The sample was then tested for its sensing efficiency by measuring the T-MOKE using distilled water and a glucose solution, respectively: It was possible to distinguish between two different solutions. Our MO-SPR materials utilizing both magnetism and near-field light are thus sufficiently sensitive to be applicable as sensing materials. Furthermore, the polarity of the T-MOKE signal is flipped under the application of a small, external magnetic field owing to the soft magnetism of the FeSi T-MOKE layer. This is highly advantageous to create high-frequency AC-magnetic synchronized T-MOKE sensing systems with low-power consumption.

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Polarization transformation and destructive interference on subwavelength magnetic domains in magneto-plasmonic systems

Cited by 2 publications

References 45 publications

Low-temperature diffusion in thin-film Pt-(Au-)-Co heterostructures: a structural and magnetic characterization

Low-temperature diffusion in thin-film Pt-(Au-)-Co heterostructures: a structural and magnetic characterization

Magneto-optical efficiencies combined with surface-plasmon resonance in FeSi/Au system

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