On the limits of coercivity in permanent magnets
Fischbacher, J; Kovacs, A; Oezelt, H; et al.Gusenbauer, M; Schrefl, T; Exl, L; Givord, D; Dempsey, NM; Zimanyi, G; Winklhofer, M; Hrkac, G; Chantrell, R; Sakuma, N; Yano, M; Kato, A; Shoji, T; Manabe, A
Date: 16 August 2017
Journal
Applied Physics Letters
Publisher
AIP Publishing
Publisher DOI
Abstract
The maximum coercivity that can be achieved for a given hard magnetic alloy is estimated by computing the energy barrier for the nucleation of a reversed domain in an idealized microstructure without any structural defects and without any soft magnetic secondary phases. For Sm1–zZrz(Fe1–yCoy)12–xTix based alloys, which are considered ...
The maximum coercivity that can be achieved for a given hard magnetic alloy is estimated by computing the energy barrier for the nucleation of a reversed domain in an idealized microstructure without any structural defects and without any soft magnetic secondary phases. For Sm1–zZrz(Fe1–yCoy)12–xTix based alloys, which are considered an alternative to Nd2Fe14B magnets with a lower rare-earth content, the coercive field of a small magnetic cube is reduced to 60% of the anisotropy field at room temperature and to 50% of the anisotropy field at elevated temperature (473 K). This decrease of the coercive field is caused by misorientation, demagnetizing fields, and thermal fluctuations.
Engineering
Faculty of Environment, Science and Economy
Item views 0
Full item downloads 0