Abstract
Directional solidification of the eutectic Mn-Bi alloy (2 at% Mn) produces an aligned array of ferromagnetic Mn-Bi needles, 0.1 to 1.5 μm in diameter, in a matrix of diamagnetic Bi. Samples grown at about 50 cm/hr and then annealed at 200 °C contain two magnetic phases. One phase is normal equilibrium MnBi, known in the recent literature as the low-temperature phase (LTP). The second phase is crystallographically similar to the high-temperature phase (HTP) Mn1.08Bi, but has a much lower Curie temperature of 240 K. Low-temperature hysteresis loops measured parallel and perpendicular to the axis of freezing are of unusual form. If the magnetization due to the normal MnBi phase is subtracted the resulting loop in the parallel direction has Hci≳100 kOe, suggesting single-domain behavior. The resulting loop in the perpendicular direction can be accounted for by the presence of a relatively large fourth-order anisotropy.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
