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      Driving ferromagnetic resonance frequency of FeCoB/PZN-PT multiferroic heterostructures to Ku-band via two-step climbing: composition gradient sputtering and magnetoelectric coupling

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          Abstract

          RF/microwave soft magnetic films (SMFs) are key materials for miniaturization and multifunctionalization of monolithic microwave integrated circuits (MMICs) and their components, which demand that the SMFs should have higher self-bias ferromagnetic resonance frequency f FMR, and can be fabricated in an IC compatible process. However, self-biased metallic SMFs working at X-band or higher frequency were rarely reported, even though there are urgent demands. In this paper, we report an IC compatible process with two-step superposition to prepare SMFs, where the FeCoB SMFs were deposited on (011) lead zinc niobate–lead titanate substrates using a composition gradient sputtering method. As a result, a giant magnetic anisotropy field of 1498 Oe, 1–2 orders of magnitude larger than that by conventional magnetic annealing method, and an ultrahigh f FMR of up to 12.96 GHz reaching Ku-band, were obtained at zero magnetic bias field in the as-deposited films. These ultrahigh microwave performances can be attributed to the superposition of two effects: uniaxial stress induced by composition gradient and magnetoelectric coupling. This two-step superposition method paves a way for SMFs to surpass X-band by two-step or multi-step, where a variety of magnetic anisotropy field enhancing methods can be cumulated together to get higher ferromagnetic resonance frequency.

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          Most cited references40

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          Materials science. The renaissance of magnetoelectric multiferroics.

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            Magnetoelectric coupling effects in multiferroic complex oxide composite structures.

            The study of magnetoelectric materials has recently received renewed interest, in large part stimulated by breakthroughs in the controlled growth of complex materials and by the search for novel materials with functionalities suitable for next generation electronic devices. In this Progress Report, we present an overview of recent developments in the field, with emphasis on magnetoelectric coupling effects in complex oxide multiferroic composite materials.
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              Data storage. Multiferroic memories.

              J. Scott (2007)
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                Author and article information

                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group
                2045-2322
                09 December 2014
                2014
                : 4
                : 7393
                Affiliations
                [1 ]College of Physics, and Key Laboratory of Photonics Materials and Technology in Universities of Shandong, Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University , Qingdao 266071, China
                [2 ]Department of Materials Science and Engineering, National Tsing Hua University , Hsinchu 30013, Taiwan
                [3 ]Department of Physics, School of Science, Harbin Institute of Technology , Harbin 150001, China
                Author notes
                Article
                srep07393
                10.1038/srep07393
                5377017
                25491374
                c413583a-c401-4a61-b611-6bee325966f3
                Copyright © 2014, Macmillan Publishers Limited. All rights reserved

                This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History
                : 10 September 2014
                : 20 November 2014
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