Hard magnetic property enhancement of Co7Hf-based ribbons by boron doping

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/104889

Title:	Hard magnetic property enhancement of Co7Hf-based ribbons by boron doping
Authors:	楊仲準;Chang, H. W.;Liao, M. C.;Shih, C. W.;Chang, W. C.;Yang, C. C.;Hsiao, C. H.;Ouyang, H.
Contributors:	理學院物理學系
Keywords:	Applied physics;Boron;Coercivity;Crystal structure;Crystals;Curie temperature;Demagnetization;Diffusion;Doping;Magnetic properties;Magnetism;Melt spinning;Microstructure;Remanence;Structural analysis
Date:	2014-11-10
Issue Date:	2026-04-23 12:00:44 (UTC+8)
Publisher:	American Institute of Physics;Melville: American Institute of Physics
Abstract:	摘要： Hard magnetic property enhancement of melt spun Co88Hf12 ribbons by boron doping is demonstrated. B-doping could not only remarkably enhance the magnetic properties from energy product ((BH)max) of 2.6 MGOe and intrinsic coercivity (iHc) of 1.5 kOe for B-free Co88Hf12 ribbons to (BH)max = 7.7 MGOe and iHc = 3.1 kOe for Co85Hf12B3 ribbons but also improve the Curie temperature (TC) of 7:1 phase. The (BH)max value achieved in Co85Hf12B3 ribbons is the highest in Co-Hf alloy ribbons ever reported, which is about 15% higher than that of Co11Hf2B ribbons spun at 16 m/s [M. A. McGuire, O. Rios, N. J. Ghimire, and M. Koehler, Appl. Phys. Lett. 101, 202401 (2012)]. The structural analysis confirms that B enters the orthorhombic Co7Hf (7:1) crystal structure as interstitial atoms, forming Co7HfBx, in the as-spun state. Yet B may diffuse out from the 7:1 phase after post-annealing, leading to the reduction of Curie temperature and the magnetic properties. The uniformly refined microstructure with B-doping results in high remanence (Br) and improves the squareness of demagnetization curve. The formation of interstitial-atom-modified Co7HfBx phase and the microstructure refinement are the main reasons to give rise to the enhancement of hard magnetic properties in the B-containing Co7Hf-based ribbons. 出版者： Melville: American Institute of Physics 出版日期： 2014-11-10 出處： Applied physics letters, 2014-11, Vol.105 (19) 資源來源： AIP Journals (American Institute of Physics) 版權： 2014 AIP Publishing LLC. 識別號： ISSN: 0003-6951 識別號： EISSN: 1077-3118 識別號： DOI: 10.1063/1.4901737
Appears in Collections:	[Department of Physics] journal & Dissertation

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