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      Highly anisotropic Fe 3C microflakes constructed by solid-state phase transformation for efficient microwave absorption

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          Abstract

          Soft magnetic materials with flake geometry can provide shape anisotropy for breaking the Snoek limit, which is promising for achieving high-frequency ferromagnetic resonances and microwave absorption properties. Here, two-dimensional (2D) Fe 3C microflakes with crystal orientation are obtained by solid-state phase transformation assisted by electrochemical dealloying. The shape anisotropy can be further regulated by manipulating the thickness of 2D Fe 3C microflakes under different isothermally quenching temperatures. Thus, the resonant frequency is adjusted effectively from 9.47 and 11.56 GHz under isothermal quenching from 700 °C to 550 °C. The imaginary part of the complex permeability can reach 0.9 at 11.56 GHz, and the minimum reflection loss ( RL min ) is −52.09 dB (15.85 GHz, 2.90 mm) with an effective absorption bandwidth (EAB ≤−10 dB) of 2.55 GHz. This study provides insight into the preparation of high-frequency magnetic loss materials for obtaining high-performance microwave absorbers and achieves the preparation of functional materials from traditional structural materials.

          Abstract

          Fe 3C microflakes with high magnetic anisotropy are prepared through solid-state phase transformation and electrochemical dealloying. The magnetic anisotropy can be tuned by adjusting the morphology, resulting in optimized ferromagnetic resonance behavior for microwave absorption

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          Broadband and tunable high-performance microwave absorption of an ultralight and highly compressible graphene foam.

          The broadband and tunable high-performance microwave absorption properties of an ultralight and highly compressible graphene foam (GF) are investigated. Simply via physical compression, the microwave absorption performance can be tuned. The qualified bandwidth coverage of 93.8% (60.5 GHz/64.5 GHz) is achieved for the GF under 90% compressive strain (1.0 mm thickness). This mainly because of the 3D conductive network.
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            The design and verification of MuMax3

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              Anomalous absorption of electromagnetic waves by 2D transition metal carbonitride Ti3CNT x (MXene).

              Lightweight, ultrathin, and flexible electromagnetic interference (EMI) shielding materials are needed to protect electronic circuits and portable telecommunication devices and to eliminate cross-talk between devices and device components. Here, we show that a two-dimensional (2D) transition metal carbonitride, Ti3CNT x MXene, with a moderate electrical conductivity, provides a higher shielding effectiveness compared with more conductive Ti3C2T x or metal foils of the same thickness. This exceptional shielding performance of Ti3CNT x was achieved by thermal annealing and is attributed to an anomalously high absorption of electromagnetic waves in its layered, metamaterial-like structure. These results provide guidance for designing advanced EMI shielding materials but also highlight the need for exploring fundamental mechanisms behind interaction of electromagnetic waves with 2D materials.
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                Author and article information

                Contributors
                liyx@mail.neu.edu.cn
                zhang@hdu.edu.cn
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                19 February 2024
                19 February 2024
                2024
                : 15
                : 1497
                Affiliations
                [1 ]Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, ( https://ror.org/0576gt767) Hangzhou, 310012 China
                [2 ]Key Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, ( https://ror.org/03awzbc87) Shenyang, 110819 China
                Author information
                http://orcid.org/0000-0001-8528-2104
                http://orcid.org/0000-0002-6180-9730
                http://orcid.org/0000-0003-4110-8096
                http://orcid.org/0000-0002-0852-6715
                Article
                45815
                10.1038/s41467-024-45815-w
                10876570
                38374257
                91fa8e84-217e-4a15-9388-8ccc13d337fb
                © The Author(s) 2024

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 14 March 2023
                : 30 January 2024
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100001809, National Natural Science Foundation of China (National Science Foundation of China);
                Award ID: 52201202
                Award ID: U22A20117
                Award ID: 52225312
                Award Recipient :
                Funded by: FundRef https://doi.org/10.13039/501100004731, Natural Science Foundation of Zhejiang Province (Zhejiang Provincial Natural Science Foundation);
                Award ID: 2019C01121
                Award ID: 2021C01033
                Award Recipient :
                Categories
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                © Springer Nature Limited 2024

                Uncategorized
                magnetic properties and materials,synthesis and processing
                Uncategorized
                magnetic properties and materials, synthesis and processing

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