Effects of thickness on structure and magnetic property of Fe-Y-B thin films

THIN SOLID FILMS

卷:616

Article

Liu, S. Y.^1,4  Cao, Q. P.^1,4  Wang, X. D.^1,4  Zhang, D. X.²  Su, Q. M.³  Du, G. H.³  Jiang, J. Z.^1,4 

[1] Zhejiang Univ, ICNSM, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, State Key Lab Modem Opt Instrumentat, Hangzhou 310027, Peoples R China

[3] Zhejiang Normal Univ, Key Lab, Minist Educ Adv Catalysis Mat, Inst Phys Chem, Jinhua 321004, Peoples R China

[4] Zhejiang Univ, Sch Mat Sci & Engn, Lab New Struct Mat, Hangzhou 310027, Peoples R China

关键词: Amorphous thin film;    Growth mode;    Soft magnetic property;    Magneto-impedance effect;    Film thickness;   

DOI  :  10.1016/j.tsf.2016.09.027

来源: Elsevier

【 摘 要 】

The effects of film thickness on structure and magnetic property of Fe-Y-B were investigated systematically. The 283 nm-thick film was in fully amorphous state, and nanocrystals gradually appeared in the amorphous matrix with increasing thickness. Local roughness at small length scale also rose, indicating the anomalous growth mode. Meanwhile, soft magnetic property and magneto-impedance (MI) effect were significantly enhanced as the film thickness was initially increased. The appearance of nanograins in the soft magnetic matrix may lead to exchange averaging of the magnetic anisotropy, decreasing the coercivity and increasing both electrical conductivity and magnetic permeability, which can lessen the skin depth with the increasing thickness and result in the improved MI effect. As the deposition time was further prolonged, MI sensitivity remained almost unchanged in the thicker films, while MI ratio further increased, indicating that MI sensitivity relied more on the coercivity and electrical conductivity, and MI ratio on magnetic permeability and the ratio of skin depth to film thickness, since both the coercivity and electrical conductivity approach the saturated ranges and magnetic permeability continuously increased with thickness. (C) 2016 Elsevier B.V. All rights reserved.

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