High-frequency power loss mechanisms in ultra-thin amorphous ribbons

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:519

Article

Masood, Ansar¹  Baghbaderani, H. A.¹  Alvarez, K. L.²  Blanco, J. M.³  Pavlovic, Z.¹  Strom, V.⁴  Stamenov, P.^5,6  Mathuna, C. O.¹  McCloskey, P.¹ 

[1] Univ Coll Cork UCC, Tyndall Natl Inst, Micro & Nano Syst Ctr, Cork T12 R5CP, Ireland

[2] CEIT Basque Res & Technol Alliance BRTA, Manuel Lardizabal 15, Donostia San Sebastian 20018, Spain

[3] Univ Basque Country, Fac Engn Gipuzkoa, Dept Appl Phys 1, San Sebastian, Spain

[4] KTH Royal Inst Technol, Mat Sci & Engn Dept, Brinellvagen 23, S-10044 Stockholm, Sweden

[5] Trinity Coll Dublin, Sch Phys, 43 Pears St, Dublin 2, Ireland

[6] Trinity Coll Dublin, CRANN, 43 Pears St, Dublin 2, Ireland

关键词: Soft magnetic materials;    Amorphous alloys;    Ultra-thin ribbons;    High-frequency applications;    Materials loss mechanisms;    Eddy current loss;    Excess loss;   

DOI  :  10.1016/j.jmmm.2020.167469

来源: Elsevier

【 摘 要 】

Soft magnetic amorphous materials with ultra-low power loss are highly desirable for high-frequency drive applications. The present work demonstrates the high-frequency power loss performance and underlying loss mechanisms in ultra-thin amorphous alloys. This is achieved by rapid-quenching amorphous alloys of Co-, CoFeand Fe-rich systems, investigating their amorphous atomic structure, quantifying the saturation magnetostriction constants (2ts), imaging magnetic domains at remanent magnetization, analyzing magnetization reversal from various magnetization levels, and finally, investigating the material loss performance over a broad frequency range (f = 50 kHz-2 MHz) at various excitation levels (Bm = 25-100 mT). The ultra-high performance of ultrathin Co-rich amorphous ribbons, as compared to CoFe- and Fe-rich alloys, was attributed to the significantly low eddy current loss, due to the reduced thickness, and a minimal amount of excess loss, owning to minimal magnetoelastic contributions and magnetization reversal by rotation. The underlying loss mechanisms were analyzed by decomposing material loss into primary components and identifying the magnetization reversal mechanisms using minor hysteresis loops. In the Co-rich amorphous alloys, we suggest that magnetization reversal by rotation dominates, at least at low excitations, while in CoFe- and Fe-rich alloys domain wall displacement prevails and contributes significantly to the excess loss up to the MHz frequency range. Magnetization reversal by rotation in Co-rich alloys could be attributed to the zero/near-zero 2ts, and eventually low residual stress, leading to a homogeneous magnetic domain structure, as compared to the inhomogeneous fingerprintlike complex domains in highly magnetostrictive CoFe-rich alloys.

【 授权许可】

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