Magnetic domains and coercivity in FeCo soft magnetic alloys

The temperature dependence of coercive field H-c of the FeCo-based soft mag netic alloy associated with the microstructure has been investigated and co rrelated with microstructural features, such as structural ordering, second phases, and the grain size. An increase in the structural ordering paramet er, determined by neutron diffraction, reduces the coercive field H-c. Lore nz microscopy observation indicates that the second phases and the grain bo undaries act as pinning sites for the magnetic domain wall movement, thus i ncrease the coercive field H-c. (C) 1999 American Institute of Physics. [S0 021-8979(99)55108-6].