TY - JOUR
T1 - An alternative approach to the measurement of anisotropy field – Single grain extraction
AU - Tozman, P.
AU - Sepehri-Amin, H.
AU - Zhang, L. T.
AU - Wang, J.
AU - Xu, X. D.
AU - Hono, K.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/15
Y1 - 2020/1/15
N2 - A fast and cost effective way to determine the anisotropy field (µ0Ha) and the saturation magnetization (µ0Ms) of a hard magnetic compound is crucial to search for new permanent magnet materials. A single crystal in a defined shape is the conventional way to determine µ0Ha. However, the growth of phase-pure single crystalline sample is not always possible for some hard magnetic compounds with poor phase stability. In this study, we propose and demonstrate a fast and cost-effective method for determining µ0Ha and µ0Ms of a main phase in complex alloys. For this purpose, a single grain in trapezoidal prism shape was micro-sampled from bulk heterogeneous (Sm0.8Zr0.2)(Fe0.8Co0.2)11.5Ti0.5 ingot using focused ion beam, from which the magnetization and the anisotropy filed of the ThMn12-type phase in the alloy was determined to be μ0Ms = 1.53 T and µ0Ha = 8.2 T. Electron backscattered diffraction (EBSD) was carried out prior to the lift-out process to select desired region with a known c-axis direction, parallel to the lift out direction in this work. The reliability of this technique was tested by comparing the result with that for the (Nd0.9Dy0.1)2Fe14B single crystal.
AB - A fast and cost effective way to determine the anisotropy field (µ0Ha) and the saturation magnetization (µ0Ms) of a hard magnetic compound is crucial to search for new permanent magnet materials. A single crystal in a defined shape is the conventional way to determine µ0Ha. However, the growth of phase-pure single crystalline sample is not always possible for some hard magnetic compounds with poor phase stability. In this study, we propose and demonstrate a fast and cost-effective method for determining µ0Ha and µ0Ms of a main phase in complex alloys. For this purpose, a single grain in trapezoidal prism shape was micro-sampled from bulk heterogeneous (Sm0.8Zr0.2)(Fe0.8Co0.2)11.5Ti0.5 ingot using focused ion beam, from which the magnetization and the anisotropy filed of the ThMn12-type phase in the alloy was determined to be μ0Ms = 1.53 T and µ0Ha = 8.2 T. Electron backscattered diffraction (EBSD) was carried out prior to the lift-out process to select desired region with a known c-axis direction, parallel to the lift out direction in this work. The reliability of this technique was tested by comparing the result with that for the (Nd0.9Dy0.1)2Fe14B single crystal.
KW - Anisotropy field
KW - Focused ion beam
KW - Hard magnetic materials
KW - Saturation magnetization
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U2 - 10.1016/j.jmmm.2019.165747
DO - 10.1016/j.jmmm.2019.165747
M3 - Article
AN - SCOPUS:85071884448
VL - 494
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
M1 - 165747
ER -