12010-50-3Relevant articles and documents
Synthesis and characterization of rare-earth-free magnetic manganese bismuth nanocrystals
Shen, Jian,Cui, Huizhong,Huang, Xiaopeng,Gong, Maogang,Qin, Wei,Kirkeminde, Alec,Cui, Jun,Ren, Shenqiang
, p. 5567 - 5570 (2015)
Earth abundant manganese bismuth (MnBi) has long been of interest due to its large magnetocrystalline anisotropy and high energy density for advanced permanent magnet applications. However, solution synthesis of MnBi phase is challenging due to the reduction potential mismatch between Mn and Bi elements. In this study, we show a versatile MnBi synthesis method involving the metal co-reduction followed by thermal annealing. The magnetically hard MnBi crystalline phase is then exchange coupled with magnetically soft cobalt coating. Our processing approach offers a promising strategy for manufacturing rare-earth-free magnetic nanocrystals. This journal is
Change of the equilibrium state of ferromagnetic MnBi by high magnetic fields
Koyama, Keiichi,Mitsui, Yoshifuru,Choi, Eun Sang,Ikehara, Yuki,Palm, Eric C.,Watanabe, Kazuo
, p. L78-L80 (2011)
Differential thermal analysis was carried out for ferromagnetic material MnBi in the temperature range 300-773 K in magnetic fields up to 45 T to investigate the effect of high magnetic fields on its decomposition process and corresponding phase diagram.
Anisotropic nanocrystalline MnBi with high coercivity at high temperature
Yang,Yang,Chen,Ma,Han,Yang,Guo,Yan,Huang,Wu,Chen
, (2011)
Magnetic hard nanocrystalline MnBi has been prepared by melt spinning and subsequent low temperature annealing. A coercivity of 2.5 T can be achieved at 540 K for MnBi with an average grain size of about 20-30 nm. The coercivity iHc, mainly controlled by the coherent magnetization rotation, shows a strong dependence on the time of grinding and exhibits a positive temperature coefficient from 100 up to 540 K. The unique temperature dependent behavior of the coercivity (magnetocrystalline anisotropy) has a relationship with the variations in the crystal lattice ratio of c/a with temperatures. In addition, discontinuity can not be found in the lattice parameters of a, c, and c/a ratio at the magnetostructural transition temperature. The nanocrystalline MnBi powder fixed in an epoxy resin and under an applied magnetic field of 24 kOe shows a maximum energy product of 7.1 MGOe at room temperature and shows anisotropic characteristics with high Mr/Ms ratio up to 560 K.
Alignment and analyses of MnBiBi nanostructures
Kang,Lewis,Moodenbaugh
, (2005)
A Mn5 Bi95 alloy was rapidly solidified into a mixture of nanocrystalline Bi and metastable Bi(Mn). Heating the ribbons to temperature T=525 K in a dc magnetic field causes formation and c -axis alignment of low-temperature phase (LTP) MnBi nanorods along the applied field direction. Nanorod alignment increases with increased magnetic field, with a calculated alignment half-angle of 47° for a sample heated to 520 K at 50 kOe. In situ magnetization changes suggest that nanorod alignment is achieved by rotation of MnBi particles. Particle alignment enables the measurement of the MnBi nanorod spin reorientation temperature of 100 K, the same as its bulk counterpart.
Effect of a high magnetic field on the morphology and magnetic properties of the MnBi compound during the Mn1.08Bi-MnBi phase transformation process
Li, Xi,Ren, Zhongming,Fautrelle, Yves,Deng, Kang
, p. 2694 - 2700 (2009)
Effect of a 10 T high magnetic field on the morphology and magnetic properties of the MnBi compounds during the Mn1.08Bi-MnBi phase transformation has been investigated. Results indicate that the field has split the MnBi crystal along the (0 0
