Biosensors 2014, 4(3), 189-203; doi:10.3390/bios4030189

Magnetic Properties of FeNi-Based Thin Film Materials with Different Additives

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Received: 21 April 2014; in revised form: 10 June 2014 / Accepted: 23 June 2014 / Published: 4 July 2014
(This article belongs to the Special Issue Magnetic Biosensors)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: This paper presents a study of FeNi-based thin film materials deposited with Mo, Al and B using a co-sputtering process. The existence of soft magnetic properties in combination with strong magneto-mechanical coupling makes these materials attractive for sensor applications. Our findings show that FeNi deposited with Mo or Al yields magnetically soft materials and that depositing with B further increases the softness. The out-of-plane magnetic anisotropy of FeNi thin films is reduced by depositing with Al and completely removed by depositing with B. The effect of depositing with Mo is dependent on the Mo concentration. The coercivity of FeNiMo and FeNiAl is reduced to less than a half of that of FeNi, and a value as low as 40 A/m is obtained for FeNiB. The surfaces of the obtained FeNiMo, FeNiAl and FeNiB thin films reveal very different morphologies. The surface of FeNiMo shows nano-cracks, while the FeNiAl films show large clusters and fewer nano-cracks. When FeNi is deposited with B, a very smooth morphology is obtained. The crystal structure of FeNiMo strongly depends on the depositant concentration and changes into an amorphous structure at a higher Mo level. FeNiAl thin films remain polycrystalline, even at a very high concentration of Al, and FeNiB films are amorphous, even at a very low concentration of B.
Keywords: magnetic sensor; magnetoelastic; magnetostriction; longitudinal vibration; magnetic thin films; magnetic materials
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MDPI and ACS Style

Liang, C.; Gooneratne, C.P.; Wang, Q.X.; Liu, Y.; Gianchandani, Y.; Kosel, J. Magnetic Properties of FeNi-Based Thin Film Materials with Different Additives. Biosensors 2014, 4, 189-203.

AMA Style

Liang C, Gooneratne CP, Wang QX, Liu Y, Gianchandani Y, Kosel J. Magnetic Properties of FeNi-Based Thin Film Materials with Different Additives. Biosensors. 2014; 4(3):189-203.

Chicago/Turabian Style

Liang, Cai; Gooneratne, Chinthaka P.; Wang, Qing X.; Liu, Yang; Gianchandani, Yogesh; Kosel, Jurgen. 2014. "Magnetic Properties of FeNi-Based Thin Film Materials with Different Additives." Biosensors 4, no. 3: 189-203.

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