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      Engineering optical mode ferromagnetic resonance in FeCoB films with ultrathin Ru insertion

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          Abstract

          Ferromagnetic resonance (FMR) in soft magnetic films (SMFs) to a large extent determines the maximum working frequency of magnetic devices. The FMR frequency ( f r) in an optical mode is usually much higher than that in the corresponding acoustic mode for exchange coupled ferromagnet/nonmagnet/ferromagnet (FM/NM/FM) trilayers. In this study, we prepared a 50 nm FeCoB film with uniaxial magnetic anisotropy (UMA), showing a high acoustic mode f r of 4.17 GHz. When an ultrathin Ru spacer was inserted in the very middle of the UMA-FeCoB film, the zero-field FMR was abruptly switched from an acoustic mode to an optical one with f r dramatically enhanced from 4.17 GHz to 11.32 GHz. Furthermore, the FMR mode can be readily tuned to optical mode only, acoustic mode only, or double mode by simply varying the applied filed, which provides a flexible way to design multi-band microwave devices.

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          Magnetic resonance determination of the antiferromagnetic coupling of Fe layers through Cr

          G A Prinz, A. Chaiken, P. Lubitz … (1989)
          Article 0 comments Cited 103 times – based on 0 reviews     Review now
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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

            Shandong Li, Qian Xue, Jenq-Gong Duh … (2014)
            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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              Tunable zero-field ferromagnetic resonance frequency from S to X band in oblique deposited CoFeB thin films

              Chengyi Li, Guozhi Chai, Chengcheng Yang … (2015)
              Tunable zero-field ferromagnetic resonance frequency in wide range is very useful for the application of microwave devices. We performed an investigation of the static and high frequency magnetic properties for oblique sputtered CoFeB thin films. The static magnetic results revealed that oblique sputtered CoFeB thin films possess well defined in-plane uniaxial magnetic anisotropy, which increases monotonically from 50.1 to 608.8 Oe with the increasing of deposition angle from 10° to 70°. Continuous modification of the resonance frequency of CoFeB thin films in a range of 2.83–9.71 GHz (covers three microwave bands including S, C and X bands) has been achieved. This behavior can be explained as the result of the microstructure due to the self-shadowing effect mainly. These CoFeB thin films with tunable magnetic properties may be good candidates for usage in microwave devices.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 15 September 2016
                Publication date Collection: 2016
                Volume: 6
                Electronic Location Identifier: 33349
                Affiliations
                [1 ]College of Physics, Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, and Key Laboratory of Photonics Materials and Technology in Universities of Shandong, Qingdao University , Qingdao 266071, China
                [2 ]Department of Cardiology, the Affiliated Hospital of Qingdao University , Qingdao 266100, China
                [3 ]Institute for Quantum Computing, Department of Electrical and Computer Engineering, University of Waterloo , Waterloo, N2L 3G1, Canada
                [4 ]National Laboratory of Solid State Microstructures, Nanjing University , Nanjing 210093, China
                [5 ]Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fujian, 350002, China
                [6 ]School of Physics, Shandong University , Jinan 250100, China
                [7 ]Department of Physics, School of Science, Harbin Institute of Technology , Harbin, 150001, China
                Author notes
                Article
                Publisher Item ID: srep33349
                DOI: 10.1038/srep33349
                PMC ID: 5024132
                PubMed ID: 27628089
                SO-VID: 94d05a5d-86db-4ce5-a5e3-0a166b9907dd
                Copyright statement: Copyright © 2016, The Author(s)
                License:

                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 to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History
                Date received : 09 August 2016
                Date accepted : 25 August 2016
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