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    Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors

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    Type
    Article
    Authors
    Liang, Cai cc
    Gooneratne, Chinthaka Pasan
    Cha, Dong Kyu
    Chen, Long
    Gianchandani, Yogesh
    Kosel, Jürgen cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Imaging and Characterization Core Lab
    Physical Science and Engineering (PSE) Division
    Sensing, Magnetism and Microsystems Lab
    Date
    2012-12-08
    Online Publication Date
    2012-12-08
    Print Publication Date
    2012-12
    Permanent link to this record
    http://hdl.handle.net/10754/552789
    
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    Abstract
    MetglasTM 2826MB foils of 25–30 μm thickness with the composition of Fe40Ni38Mo4B18 have been used for magnetoelastic sensors in various applications over many years. This work is directed at the investigation of ∼3 μm thick iron-nickel-molybdenum-boron (FeNiMoB) thin films that are intended for integrated microsystems. The films are deposited on Si substrate by co-sputtering of iron-nickel (FeNi), molybdenum(Mo), and boron (B) targets. The results show that dopants of Mo and B can significantly change the microstructure and magnetic properties of FeNi materials. When FeNi is doped with only Mo its crystal structure changes from polycrystalline to amorphous with the increase of dopant concentration; the transition point is found at about 10 at. % of Mo content. A significant change in anisotropic magneticproperties of FeNi is also observed as the Modopant level increases. The coercivity of FeNi filmsdoped with Mo decreases to a value less than one third of the value without dopant.Doping the FeNi with B together with Mo considerably decreases the value of coercivity and the out-of-plane magnetic anisotropyproperties, and it also greatly changes the microstructure of the material. In addition, doping B to FeNiMo remarkably reduces the remanence of the material. The filmmaterial that is fabricated using an optimized process is magnetically as soft as amorphous MetglasTM 2826MB with a coercivity of less than 40 Am−1. The findings of this study provide us a better understanding of the effects of the compositions and microstructure of FeNiMoB thin filmmaterials on their magnetic properties.
    Citation
    Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors 2012, 112 (11):113912 Journal of Applied Physics
    Publisher
    AIP Publishing
    Journal
    Journal of Applied Physics
    DOI
    10.1063/1.4768458
    Additional Links
    http://scitation.aip.org/content/aip/journal/jap/112/11/10.1063/1.4768458
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4768458
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Electrical and Computer Engineering Program; Sensing, Magnetism and Microsystems Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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