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

Liang C, Gooneratne CP, Wang QX, Liu Y, Gianchandani Y, Kosel J - Biosensors (Basel) (2014)

Bottom Line: The effect of depositing with Mo is dependent on the Mo concentration.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.

View Article: PubMed Central - PubMed

Affiliation: Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology, 4700 Kaust, Thuwal 23955, Saudi Arabia; E-Mails: chinthaka.gooneratne@gmail.com (C.P.G.); jurgen.kosel@kaust.edu.sa (J.K.).

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.

No MeSH data available.


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Magnetization loops for (a) FeNiAl, (b) FeNiMo and (c) FeNiB, at various concentrations of Al, Mo and B.
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biosensors-04-00189-f004: Magnetization loops for (a) FeNiAl, (b) FeNiMo and (c) FeNiB, at various concentrations of Al, Mo and B.

Mentions: The in-plane magnetization behaviors of FeNi thin film materials with and without additives are plotted in Figure 4. A significant difference in the magnetization characteristics can be seen between films with different additives and different additive concentrations: (1) FeNi becomes magnetically softer when deposited with any of elements Mo, Al, or B; (2) The required magnetic fields to reach the saturation of magnetization for FeNiAl, FeNiMo and FeNiB are about 95 kA/m, 80 kA/m and 8 kA/m, respectively, which are considerably lower than the one required to saturate FeNi films without additives; and (3) in the lower range of the applied field strength, the magnetization change with the field strength (dM/dH), or the susceptibility, increases when FeNi is deposited with any of Mo, Al and B. The susceptibility slightly increases for the FeNiMo and FeNiAl, and a massive increase is obtained in the case of FeNiB. The three outstanding properties of the FeNiB films, a significant decrease in both coercivity and the saturation magnetization field and an increase in susceptibility, are due to the smooth, nano-granular clusters and amorphous structure of the films, which completely remove the anisotropy in the direction perpendicular to the film’s surface.


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

Liang C, Gooneratne CP, Wang QX, Liu Y, Gianchandani Y, Kosel J - Biosensors (Basel) (2014)

Magnetization loops for (a) FeNiAl, (b) FeNiMo and (c) FeNiB, at various concentrations of Al, Mo and B.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4264354&req=5

biosensors-04-00189-f004: Magnetization loops for (a) FeNiAl, (b) FeNiMo and (c) FeNiB, at various concentrations of Al, Mo and B.
Mentions: The in-plane magnetization behaviors of FeNi thin film materials with and without additives are plotted in Figure 4. A significant difference in the magnetization characteristics can be seen between films with different additives and different additive concentrations: (1) FeNi becomes magnetically softer when deposited with any of elements Mo, Al, or B; (2) The required magnetic fields to reach the saturation of magnetization for FeNiAl, FeNiMo and FeNiB are about 95 kA/m, 80 kA/m and 8 kA/m, respectively, which are considerably lower than the one required to saturate FeNi films without additives; and (3) in the lower range of the applied field strength, the magnetization change with the field strength (dM/dH), or the susceptibility, increases when FeNi is deposited with any of Mo, Al and B. The susceptibility slightly increases for the FeNiMo and FeNiAl, and a massive increase is obtained in the case of FeNiB. The three outstanding properties of the FeNiB films, a significant decrease in both coercivity and the saturation magnetization field and an increase in susceptibility, are due to the smooth, nano-granular clusters and amorphous structure of the films, which completely remove the anisotropy in the direction perpendicular to the film’s surface.

Bottom Line: The effect of depositing with Mo is dependent on the Mo concentration.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.

View Article: PubMed Central - PubMed

Affiliation: Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology, 4700 Kaust, Thuwal 23955, Saudi Arabia; E-Mails: chinthaka.gooneratne@gmail.com (C.P.G.); jurgen.kosel@kaust.edu.sa (J.K.).

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.

No MeSH data available.


Related in: MedlinePlus