Correlation between domain structure, surface anisotropy and high frequency magneto-impedance in Joule annealed CoFe-based melt-spun ribbons

JOURNAL OF ALLOYS AND COMPOUNDS

卷:682

Article

Eggers, T.¹  Leary, A.²  McHenry, M.²  Marcin, J.³  Skorvanek, I.³  Srikanth, H.¹  Phan, M. H.¹ 

[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[2] Carnegie Mellon Univ, Mat Sci & Engn Dept, Pittsburgh, PA 15213 USA

[3] Slovak Acad Sci, Inst Expt Phys, Watsonova 47, Kosice 04001, Slovakia

关键词: Fe-rich amorphous ribbons;    Surface anisotropy;    Magneto-impedance;    Magnetic sensors;   

DOI  :  10.1016/j.jallcom.2016.04.312

来源: Elsevier

【 摘 要 】

(Fe65Co35)(83.5-x)B13NbxSi2Cu1.5 amorphous ribbons with (4 at.%) and without (0 at.%) growth inhibitor Nb were Joule annealed at low current intensity to avoid bulk crystallization, and their surface domain structure, bulk and surface magnetization, and high frequency magneto-impedance (MI) were systematically investigated. Magneto-optic Kerr effect (MOKE) microscopy and longitudinal MOKE evidenced the development of a longitudinal surface anisotropy in the ribbon without Nb (Nb0) as a result of the Joule annealing treatment, while the 4 at.% Nb (Nb4) ribbon developed an anisotropy 30 degrees from the transverse direction. The increased transverse ac permeability at the surface of Nb4 was evident in MI measurements by a higher [Delta Z/Z](max) as compared to Nb0 at frequencies greater than 200 MHz. A correlation between the surface domain structure, induced anisotropy and high frequency MI in the ribbons was established. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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