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Inducing anisotropy in bulk Nd-Fe-Co-Al-B nanocrystalline alloys by quenching in magnetic field |
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| Authors: | Nguyen Huy Dan Pham Thi ThanhNguyen Hai Yen Nguyen Thi Thanh Huyen Duong Dinh Thang Luu Tien Hung |
| Affiliation: | a Institute of Materials Science, 18 Hoang Quoc Viet, Hanoi, Vietnam b Quang Ninh University of Industry, Quang Ninh, Vietnam c Hanoi University of Education No. 2, Vinh Phuc, Vietnam d Vinh University, Nghe An, Vietnam |
| Abstract: | We have observed magnetic anisotropy in bulk Nd55−xCoxFe30Al10B5 (x=10, 15 and 20) alloys prepared by copper mold suction casting method with a presence of external magnetic field (quenching field) μ0H=0.25 T. By changing direction of the measuring field from perpendicular to parallel one in comparison with that of the quenching field, coercive force of the alloys slightly decreases while remanent magnetization and squareness of hysteresis loop increase more clearly. It is also found that the higher Co-concentration in the alloys the larger magnetic anisotropy is induced. The structure analyses manifest nanocrystalline particles embedded in residual amorphous matrix of the alloys. The size of the particles is in range of 10-30 nm and their crystalline phases consist of Nd2(Fe,Co)14B, Nd3Co, Nd3Al, NdAl2 and Nd. |
| Keywords: | Hard magnetic materials Magnetic anisotropy Nanostructured materials Bulk nanocrystalline materials Rapid solidification |
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