Impact of chromium substitution on structural and magnetic properties of MnBi-based melt-spun ribbons

Anh Kha  VUONG; Triet Minh  DANG; Truong Xuan NGUYEN; Duy Anh Vo  NGUYEN; Hai Van  PHAM; Nam Hoai  NGUYEN; Nam Hong  PHAM; Oanh Kim Thi  VUONG; Tan Nhut Nguyen  LE; Tuan Van  DINH; Nam Thanh Tran  NGUYEN; Nhan Thi  TRAN; Trung Quoc  NGUYEN; Nhan Thi  TRAN; Trung Quoc  NGUYEN; Lu  WEI; Vuong Van  NGUYEN

doi:10.55713/jmmm.v36i2.2491

ผู้แต่ง

Anh Kha VUONG Institute of Materials Science, Vietnam Academy of Science and Technology, No.18, Hoang Quoc Viet Road, Cau Giay district, Hanoi, Vietnam; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, No. 18, Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam; Faculty of Pedagogy, Hanoi Metropolitan University, No. 98, Duong Quang Ham road, Cau Giay District, Hanoi, Vietnam
Triet Minh DANG Can Tho University, 3/2 Road, Ninh Kieu District, Can Tho, Vietnam
Truong Xuan NGUYEN Institute of Materials Science, Vietnam Academy of Science and Technology, No.18, Hoang Quoc Viet Road, Cau Giay district, Hanoi, Vietnam; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, No. 18, Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
Duy Anh Vo NGUYEN FPT University, Can Tho campus, Can Tho City 900000, Vietnam
Hai Van PHAM Faculty of Physics and Institute of Natural Sciences, National University of Education, No.136, Xuan Thuy Street, Cau Giay District, Hanoi,Vietnam
Nam Hoai NGUYEN Institute of Materials Science, Vietnam Academy of Science and Technology, No.18, Hoang Quoc Viet Road, Cau Giay district, Hanoi, Vietnam
Nam Hong PHAM Institute of Materials Science, Vietnam Academy of Science and Technology, No.18, Hoang Quoc Viet Road, Cau Giay district, Hanoi, Vietnam
Oanh Kim Thi VUONG Institute of Materials Science, Vietnam Academy of Science and Technology, No.18, Hoang Quoc Viet Road, Cau Giay district, Hanoi, Vietnam
Tan Nhut Nguyen LE Can Tho University, 3/2 Road, Ninh Kieu District, Can Tho, Vietnam
Tuan Van DINH Electric Power University, No.235, Hoang Quoc Viet road, Cau Giay District, Hanoi, Vietnam
Nam Thanh Tran NGUYEN Faculty of Physics and Institute of Natural Sciences, National University of Education, No.136, Xuan Thuy Street, Cau Giay District, Hanoi,Vietnam
Nhan Thi TRAN Hanoi University of Industry, No.298, Cau Dien road, Bac Tu Liem District, Hanoi, Vietnam
Trung Quoc NGUYEN Institute of Materials Science, Vietnam Academy of Science and Technology, No.18, Hoang Quoc Viet Road, Cau Giay district, Hanoi, Vietnam
Nhan Thi TRAN Hanoi University of Industry, No.298, Cau Dien road, Bac Tu Liem District, Hanoi, Vietnam
Trung Quoc NGUYEN Institute of Materials Science, Vietnam Academy of Science and Technology, No.18, Hoang Quoc Viet Road, Cau Giay district, Hanoi, Vietnam
Lu WEI Shanghai Key Lab. of D&A for Metal-Functional Materials, School of Materials Science &Engineering, Tongji University, Shanghai 201804, China
Vuong Van NGUYEN Institute of Materials Science, Vietnam Academy of Science and Technology, No.18, Hoang Quoc Viet Road, Cau Giay district, Hanoi, Vietnam

DOI:

https://doi.org/10.55713/jmmm.v36i2.2491

คำสำคัญ:

Cr-doped MnBi magnetic material, DFT calculation, Magnetization, Coercivity

บทคัดย่อ

MnBi-based magnetic materials and magnets are of significant interest due to their magnetism without rare earth elements and their ability to replace Nd-Fe-B in high-temperature magnet applications due to its unique feature of enhancing coercivity in the range of 100℃ to 250℃, enabling their energy product (BH)_max comparable to NdFeB magnets despite their moderate spontaneous magnetization M_sp. To adjust the magnetic properties of MnBi magnets, various elements have been doped to regulate magnetic interactions among the atoms, which subsequently alters M_sp and the magneto-crystalline anisotropy energy. In this work, we investigate the effects of chromium doping on the magnetic properties of MnBi. The investigation includes the highlights of density functional theory (DFT) calculations and the results of doping experiments to elucidate the role of Cr dopant. The DFT consideration reveals the dynamic stability of Cr-doped MnBi system, the preferential substitution of Cr for Mn leading to the complicated modifications in the local magnetic environment. The experimental results shown the incorporation of Cr atoms into MnBi lattice and refine the microstructure of the melt-spun ribbons. Currently, the best magnetic properties are due to the Mn_52.5Cr_2.5Bi₄₅ annealed at 300℃ for 3 h with the content of the ferromagnetic phase LTP of 65.8 wt%, the saturation magnetization measured at 30 kOe M_sat = 54.6 emu∙g^‒1, the coercivity iH_c = 4.2 kOe but the energy product (BH)_max is only 3.64 MGOe.

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