All-Optical Manipulation of Magnetization in Ferromagnetic Thin Films Enhanced by Plasmonic Resonances

Feng Cheng; Chuangtang Wang; Zhaoxian Su; Xinjun Wang; Ziqiang Cai; Nian X. Sun; Yongmin Liu

doi:10.1021/acs.nanolett.0c02089

All-Optical Manipulation of Magnetization in Ferromagnetic Thin Films Enhanced by Plasmonic Resonances

Feng Cheng, Chuangtang Wang, Zhaoxian Su, Xinjun Wang, Ziqiang Cai, Nian X. Sun, Yongmin Liu^*

^*Corresponding author for this work

Department of Mechanical and Industrial Engineering, Northeastern University

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

In this paper, we report all-optical manipulation of magnetization in ferromagnetic Co/Pt thin films enhanced by plasmonic resonances. By annealing a thin Au layer, we fabricate large-area Au nanoislands on top of the Co/Pt magnetic thin films, which show plasmonic resonances around the wavelength of 606 nm. Using a customized magneto-optical Kerr effect setup, we experimentally observe an 18.5% decrease in the minimum laser power required to manipulate the magnetization, comparing the on- and off-resonance conditions. The results are in very good agreement with numerical simulations. Our research findings demonstrate the possibility to achieve an all-optical magnetic recording with low energy consumption, low cost, and high areal density by integrating plasmonic nanostructures with magnetic media.

Original language	English
Pages (from-to)	6437-6443
Number of pages	7
Journal	Nano Letters
Volume	20
Issue number	9
DOIs	https://doi.org/10.1021/acs.nanolett.0c02089
Publication status	Published - 9 Sept 2020
Externally published	Yes

Keywords

all-optical manipulation
ferromagnetic materials
magnetization
plasmonics

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1021/acs.nanolett.0c02089

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title = "All-Optical Manipulation of Magnetization in Ferromagnetic Thin Films Enhanced by Plasmonic Resonances",

abstract = "In this paper, we report all-optical manipulation of magnetization in ferromagnetic Co/Pt thin films enhanced by plasmonic resonances. By annealing a thin Au layer, we fabricate large-area Au nanoislands on top of the Co/Pt magnetic thin films, which show plasmonic resonances around the wavelength of 606 nm. Using a customized magneto-optical Kerr effect setup, we experimentally observe an 18.5% decrease in the minimum laser power required to manipulate the magnetization, comparing the on- and off-resonance conditions. The results are in very good agreement with numerical simulations. Our research findings demonstrate the possibility to achieve an all-optical magnetic recording with low energy consumption, low cost, and high areal density by integrating plasmonic nanostructures with magnetic media.",

keywords = "all-optical manipulation, ferromagnetic materials, magnetization, plasmonics",

author = "Feng Cheng and Chuangtang Wang and Zhaoxian Su and Xinjun Wang and Ziqiang Cai and Sun, {Nian X.} and Yongmin Liu",

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doi = "10.1021/acs.nanolett.0c02089",

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AU - Cheng, Feng

AU - Wang, Chuangtang

AU - Su, Zhaoxian

AU - Wang, Xinjun

AU - Cai, Ziqiang

AU - Sun, Nian X.

AU - Liu, Yongmin

PY - 2020/9/9

Y1 - 2020/9/9

N2 - In this paper, we report all-optical manipulation of magnetization in ferromagnetic Co/Pt thin films enhanced by plasmonic resonances. By annealing a thin Au layer, we fabricate large-area Au nanoislands on top of the Co/Pt magnetic thin films, which show plasmonic resonances around the wavelength of 606 nm. Using a customized magneto-optical Kerr effect setup, we experimentally observe an 18.5% decrease in the minimum laser power required to manipulate the magnetization, comparing the on- and off-resonance conditions. The results are in very good agreement with numerical simulations. Our research findings demonstrate the possibility to achieve an all-optical magnetic recording with low energy consumption, low cost, and high areal density by integrating plasmonic nanostructures with magnetic media.

AB - In this paper, we report all-optical manipulation of magnetization in ferromagnetic Co/Pt thin films enhanced by plasmonic resonances. By annealing a thin Au layer, we fabricate large-area Au nanoislands on top of the Co/Pt magnetic thin films, which show plasmonic resonances around the wavelength of 606 nm. Using a customized magneto-optical Kerr effect setup, we experimentally observe an 18.5% decrease in the minimum laser power required to manipulate the magnetization, comparing the on- and off-resonance conditions. The results are in very good agreement with numerical simulations. Our research findings demonstrate the possibility to achieve an all-optical magnetic recording with low energy consumption, low cost, and high areal density by integrating plasmonic nanostructures with magnetic media.

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KW - ferromagnetic materials

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KW - plasmonics

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All-Optical Manipulation of Magnetization in Ferromagnetic Thin Films Enhanced by Plasmonic Resonances

Abstract

Keywords

UN SDGs

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