Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors
Type
ArticleAuthors
Liang, Cai
Gooneratne, Chinthaka Pasan
Cha, Dong Kyu
Chen, Long
Gianchandani, Yogesh
Kosel, Jürgen

KAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionElectrical Engineering Program
Imaging and Characterization Core Lab
Physical Science and Engineering (PSE) Division
Sensing, Magnetism and Microsystems Lab
Date
2012-12-08Online Publication Date
2012-12-08Print Publication Date
2012-12Permanent link to this record
http://hdl.handle.net/10754/552789
Metadata
Show full item recordAbstract
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 PhysicsPublisher
AIP PublishingJournal
Journal of Applied Physicsae974a485f413a2113503eed53cd6c53
10.1063/1.4768458