The Effect of Co Concentration on the Magnetic Properties of Obliquely Sputtered Fe–Co Thin Films

Subject Areas : journal of New Materials

khalil gheisari ¹ , Chong Kim Ong ²

1 - Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 - Center for Superconducting and Magnetic Materials, Department of Physics, National University of Singapore, Singapore

Received: 2020-08-07 Accepted : 2021-01-11 Published : 2020-11-21

Keywords: Oblique sputtering technique, Fe-Co thin film, Magnetic anisotropy, Ferromagnetic resonance frequency, Thermal stability,

Abstract :

In the present work, the effect of cobalt concentration on the magnetic properties of the Fe-Co alloy thin film with the composition of CoxFe1−x (x= 0–0.3) was investigated in detail. The films deposited at the incident angle of 42° using sputtering technique. The crystalline structure of the deposited films was evaluated via the X-ray diffraction method. The static and dynamic magnetic characteristics were determined from magnetization loops and permeability spectra, respectively. With regard to the phase analysis results, similar diffraction patterns have been found representing the BCC phase with (110) preferred orientation. Nevertheless, the lattice parameter decreases with increasing Co content. M-H loops indicate different behaviour along with the easy and hard direction. Based on that, the magnetic anisotropy field rises from 60 Oe at Fe film to 333 Oe at Fe0.7Co0.3 film which in turn leads to an increase in the ferromagnetic resonance frequency from 2.44 GHz at Fe film to 7.66 GHz at Fe0.7Co0.3 film. In addition, the resonance frequency of Fe0.7Co0.3 film exhibits a slight decrease from 7.66 GHz at room temperature to 6.98 GHz at 420 K indicating good thermal stability of the obtained film.

References:

1- R. Graillot-Vuillecot, A.L. Thomann, T. Lecas, C. Cachoncinlle, F. Millon, and A. Caillard, "Hot target magnetron sputtering process: Effect of infrared radiation on the deposition of titanium and titanium oxide thin films", Vacuum, vol. 181, pp. 109734(1-14), 2020.

 

2- M. Qadir, Y. Li, and C. Wen, "Ion-substituted calcium phosphate coatings by physical vapor deposition magnetron sputtering for biomedical applications: A review", Acta Biomaterialia, vol. 89, pp.14-32, 2019.

 

3- X. Qin, L. Di, C. Sui, R. Zhao, J. Fan, F. Wang, and X. Xu, "Effects of the Mn/Bi ratio on the magnetic properties of MnBi thin films grown by magnetron co-sputtering", Journal of Alloys and Compounds, vol. 842, pp.155694 (1-8), 2020.

 

4- V. Pretti Rossi, R. Pereira Bonini, A. Marino Gonçalves, A. José Gualdi, J. Antônio Eiras, and F. Luis Zabotto, "Silicon substrate orientation influence on structural and magnetic properties of BaFe12O19 thin films obtained by RF magneton sputtering", Journal of Magnetism and Magnetic Materials, vol. 504, pp. 166705(1-6), 2020.

 

5- D. Fu and X. Cheng, "Exploring the effect on the columnar structure and porosity of the synthesized Be films by oblique angle deposition in magnetron sputtering", Physica B: Condensed Matter, vol. 590, p.412221(1-7), 2020.

 

6- E.N. Sheftel and E.V Harin, "Two modes of magnetic structure of nanocrystalline FeZrN films prepared by oblique-angle magnetron sputtering", Journal of Magnetism and Magnetic Materials, vol. 479, pp.84-87, 2019.

7- Kh. Gheisari, and C. K. Ong. "Magnetic properties and thermal stability of nanocrystalline Fe films prepared by oblique sputtering deposition method", Physica B: Condensed Matter, vol. 595, pp. 412365 (1-7), 2020.

 

8- H. Chang, Y. Huang, C. Hsieh, C. Shih, W. Chang, and D. Xue, ''Magnetic properties and high frequency characteristic of obliquely sputtered Co–M (M= V and Nb) thin films'', Journal of Alloys and Compounds, vol. 539, pp. 276-279,2012.

9- X. Zhong, N.N. Phuoc, Y. Liu, and C. Ong, ''Employment of Co underlayer and oblique deposition to obtain high resonance frequency and excellent thermal stability in FeCo thin films'', Journal of Magnetism and Magnetic Materials, vol. 365, pp. 8-13, 2014.

                       

10- L. Phua, N. Phuoc, and C. Ong, ''Investigation of the microstructure, magnetic and microwave properties of electrodeposited Ni_xFe_1−­x (x= 0.2–0.76) films'', Journal of Alloys and Compounds, vol. 520, pp. 132-139, 2012.

 

11- X. Zhong, N.N. Phuoc, W.T. Soh, C. Ong, L. Peng, and L. Li, ''Tailoring the magnetic properties and thermal stability of FeSiAl-Al₂O₃ thin films fabricated by hybrid oblique gradient-composition sputtering'', Journal of Magnetism and Magnetic Materials, vol. 429, pp. 52-59, 2017.

 

12- L. Phua, N. Phuoc, and C. Ong, ''Effect of Ni concentration on microstructure, magnetic and microwave properties of electrodeposited NiCoFe films'', Journal of Alloys and Compounds, vol. 543, pp. 1-6, 2012.

 

13-­ N.N. Phuoc, and C. Ong, ''Influence of ferromagnetic thickness on dynamic anisotropy in exchange-biased MnIr/FeCo multilayered thin films'', Physica B: Condensed Matter, vol. 406(18), pp. 3514-3518, 2011.

 

14- K. Gheisari and C.K. Ong, "Enhancing High-Frequency Properties of Nanocrystalline Sputtered Fe Thin Films by Using MnIr Underlayer and Oblique Deposition", Journal of Superconductivity and Novel Magnetism, In press, 2020.

 

15- L. Phua, N. Phuoc, and C. Ong, ''Influence of field-annealing on the microstructure, magnetic and microwave properties of electrodeposited Co_0.­3Fe_0.­7 films'', Journal of Alloys and Compounds, vol. 553, pp. 146-15, 2013.

 

16- X. Liu, H. Kanda, and A. Morisako, ''The effect of underlayers on FeCo thin films'', Journal of Physics: Conference Series, vol. 266, p. 012037 (1-5), 2011.

 

17- S. Kaushalya, V. Husain, N.K. Barwal, Gupta, S. Hait, and S. Chaudhary, ''Tunable magnetic anisotropy in obliquely sputtered Co₆₀Fe₄₀ thin films on Si (100), Physica B: Condensed Matter, vol. 570, pp 1-5, 2019.

 

18- Y. Fukuma, Z. Lu, H. Fujiwara, G. Mankey, W. Butler, and S. Matsunuma, ''Strong uniaxial magnetic anisotropy in CoFe films on obliquely sputtered Ru underlayer'', Journal of Aapplied Physics, vol. 106, pp. 076101-3, 2009.

 

19-B.D. Cullity, C.D. Graham, Introduction to Magnetic Materials, second ed., John Wiley & Sons, Inc., Hoboken, NJ, 2009.

 

20- ا. صفری، خ. قیصری، و م. فربد،"بررسی ساختار و رفتار مغناطیسی پودر فریت نیکل تولیذ شذه به روش تخلیه قوس پلاسما"، مجله مواد نوین، جلد 7، شماره 4، ص 17-26، تابستان 1396.

 

21- Y. Liu, L. Chen, C.Y. Tan, H.J. Liu, and C.K. Ong, "Broadband complex permeability characterization of magnetic thin films using shorted microstrip transmission-line perturbation. Review of scientific instruments", vol. 76(6), pp.063911(1-8), 2005.

 

22- F. Tang, D. L. Liu, D. X. Ye, Y. P. Zhao, T. M. Lu, G. C. Wang, and A. Vijayaraghavan, ''Magnetic properties of Co nanocolumns fabricated by oblique-angle deposition'', Journal of Applied Physics, vol. 93(7), pp. 4194-4200, 2003.

 

23- N.N. Phuoc, G. Chai, and C. Ong, ''Enhancing exchange bias and tailoring microwave properties of FeCo/MnIr multilayers by oblique deposition'', Journal ofApplied Physics, vol. 112(11), pp. 113908, 2012.

 

24- G. Chai, N.N. Phuoc, and C. Ong, ''Optimizing high-frequency properties of stripe domain ferrite doped CoFe thin films by means of a Ta buffer layer'', Journal of Physics D: Applied Physics, vol. 46(41), pp. 415001, 2013.

 

25- X. Zhong, N.N. Phuoc, W.T. Soh, C. Ong, and L. Li, ''Dynamic magnetization of NiZn ferrite doped FeSiAl thin films fabricated by oblique sputtering'', Journal of Magnetism and Magnetic Materials, vol. 432, 373-381, 2017.

 

26- N.N. Phuoc, and C. Ong, ''FeCoHfN thin films fabricated by co-sputtering with high resonance frequency'', Journal of Alloys and Compounds, vol. 509(9), pp. 4010-4013, 2011.

 

27- X. Zhong, N.N. Phuoc, G. Chai, Y. Liu, and C. Ong, ''Thermal stability and dynamic magnetic properties of FeSiAl films fabricated by oblique deposition'', Journal of Alloys and Compounds, vol. 610, pp. 126-131, 2014.