Zobrazeno 1 - 10
of 178
pro vyhledávání: '"Chul-Jin Choi"'
Autor:
Tian Hong Zhou, Youngwoon Song, Baochao Zhang, Xing Zheng, Chul-Jin Choi, Young-Rae Cho, Jihoon Park
Publikováno v:
Journal of Materials Research and Technology, Vol 30, Iss , Pp 3092-3100 (2024)
ThMn12-type Sm(FeV)12 magnets with high coercivity (Hc) demonstrate promising potential as alternative rare-earth-lean permanent magnets. This study delves into the microstructure and magnetic properties influenced by the Sm content in the SmxFe10V2
Externí odkaz:
https://doaj.org/article/386432d939d648a3ac02358adea2267a
Autor:
Tian Hong Zhou, Baochao Zhang, Xing Zheng, Youngwoon Song, Pingzhan Si, Chul-Jin Choi, Young-Rae Cho, Jihoon Park
Publikováno v:
Nanomaterials, Vol 14, Iss 16, p 1329 (2024)
Anisotropic bulk magnets of ThMn12-type SmFe10V2 with a high coercivity (Hc) were successfully fabricated. Powders with varying particle sizes were prepared using the ball milling process, where the particle size was controlled with milling time. A d
Externí odkaz:
https://doaj.org/article/5ab7fe71d81e44c8a02fb9dcdae23b16
Autor:
Yinghua Liang, Tingting Qi, Baochao Zhang, Qiang Zhang, Chul-Jin Choi, Jihoon Park, Tianhong Zhou, Qiong Wu, Hongliang Ge, Pingzhan Si
Publikováno v:
Materials Research Express, Vol 11, Iss 10, p 106101 (2024)
The magnetization of most magnetic materials decreases monotonically with increasing temperature. In this work, we found that the temperature coefficient of magnetization of Mn _4- _x Ga _x C alloys can be tuned from negative values to positive value
Externí odkaz:
https://doaj.org/article/087c003e814f4c8c93812c1467191763
Autor:
Hui-Dong Qian, Jung Tae Lim, Jong-Woo Kim, Yang Yang, Tian Hong Zhou, Su yeon An, Han Kook Jeon, Kyung Mox Cho, Jihoon Park, Chul-Jin Choi
Publikováno v:
Journal of Materials Research and Technology, Vol 16, Iss , Pp 1458-1465 (2022)
Si-doped Fe-rich compounds, i.e., Sm(Fe0.8Co0.2)11Ti + Six (x = 0, 0.5, and 1.0), with ThMn12-type structure in forms of ribbons and bulks were fabricated using melt-spinning process and high pressure pressing and heat treatment processes. Physical a
Externí odkaz:
https://doaj.org/article/69f7217669cc4405b2cdfebdcda8508f
Publikováno v:
Applied Sciences, Vol 12, Iss 15, p 7887 (2022)
A conventional energy product calculated by the product of the B-field and the H-field is not sufficient for representing the performance of a magnet because it considers the homogeneous and only the uniaxial magnetic properties of the magnet. The co
Externí odkaz:
https://doaj.org/article/9596d690011b4d8f8df67f2bb455a9fc
Autor:
Hui-Dong Qian, Jung Tae Lim, Jong-Woo Kim, Yang Yang, Tian Hong Zhou, Han Kook Jeon, Jihoon Park, Chul-Jin Choi
Publikováno v:
Metals, Vol 12, Iss 5, p 753 (2022)
The magnetic properties of ThMn12-type Fe-rich compounds were investigated by producing Sm(Fe0.8Co0.2)10Si2 ribbons. The produced ribbons, with different conditions by varying the melt-spinning conditions, were characterized to investigate physical a
Externí odkaz:
https://doaj.org/article/f8ad6576eacc4eccaa8162467411b69d
Publikováno v:
AIP Advances, Vol 10, Iss 1, Pp 015320-015320-4 (2020)
High coercivity B-N-doped MnAl alloys were prepared by the traditional induction melting, high temperature homogenization, water-quenching, post-annealing, and severe plastic deformation process. The massive phase transformation of the ε→τ in the
Externí odkaz:
https://doaj.org/article/5c392913e0984b8cac157d863ea612e2
Autor:
Jihoon Park, Yang-Ki Hong, Woncheol Lee, Seong-Gon Kim, Chuangbing Rong, Narayan Poudyal, J. Ping Liu, Chul-Jin Choi
Publikováno v:
Scientific Reports, Vol 7, Iss 1, Pp 1-5 (2017)
Abstract We present a simple analytical model to estimate the magnetization (σ s) and intrinsic coercivity (H ci) of a hard/soft nanocomposite magnet using the mass fraction. Previously proposed models are based on the volume fraction of the hard ph
Externí odkaz:
https://doaj.org/article/26e57594ff5945a6b552e7aaedeb299a
Autor:
Hui-Dong Qian, Jihoon Park, Jung Tae Lim, Yang Yang, Ping-Zhan Si, Jong-Woo Kim, Chul-Jin Choi, Kyung Mox Cho
Publikováno v:
AIP Advances, Vol 9, Iss 11, Pp 115213-115213-5 (2019)
Nonmagnetic phase assisted low temperature phase MnBi bulk magnetic materials, i.e., MnBi/NaCl and MnBi/C magnets, were fabricated by hot pressing mixtures of MnBi and NaCl or C powders. The effects of nonmagnetic NaCl or C on the magnetic and physic
Externí odkaz:
https://doaj.org/article/ba744bc717994220810a806a07001fb0
Publikováno v:
Nanomaterials, Vol 10, Iss 11, p 2265 (2020)
Rare-earth-free permanent magnets have attracted considerable attention due to their favorable properties and applicability for cost-effective, high-efficiency, and sustainable energy devices. However, the magnetic field annealing process, which enha
Externí odkaz:
https://doaj.org/article/eb3018f8f8ca452e84ff0b57b83f5771