Magnetic microstructures of phase-separated Sm–Co 2:17-type sintered magnets

Microstructural changes during the slow-cooling annealing of nanocrystalline SmCo 2:17 type magnets

“…Hadjipanayis and co-workers [24] found that a high copper alloy attained 20 kOe (2 T) without any slow cooling, indicating that high copper content is essential for promoting the magnetic decoupling between the 2:17 nanocells. The changes of the structure of magnetic domains observed by Gutfleisch et al [25,26] and Fang et al [27] along the slow cooling heat treatment strongly suggests that such magnetic decoupling happens. When the 2:17 nanograins became well magnetic decoupled, the average equilibrium distance between domain walls is reduced, as expected from magnetostatics considerations based on the domain wall theory described by Kittel [28,29].…”

Tribological and magnetic characterization of fluorosilanes on cobalt surface

“…Depending on the specimen thickness, cobalt and cobalt-based systems possess various magnetic properties, and especially various magnetic domain structures [3][4][5]. From the practical point of view, cobalt-based thin films and multilayers are used in high-density magnetic media, in magneto-optic recording media and as magnetic sensors [6][7][8][9], cobalt-based alloys are used as high-performance permanent magnet materials [10,11].…”

Magnetic microstructures of a high coercivity Nd–Fe–B sintered magnet in remanent and incomplete thermal demagnetization states

“…The lateral resolution has been increased to $ 10 nm by using high coercivity MFM tips [2]. To date, MFM has been widely used to reveal magnetic microstructures of permanent magnets in a completely-thermal-demagnetization (CTD) state (also called ''asgrown'' state), i.e., annealing temperature T A is greater than Curie temperature T c [3][4][5][6][7][8][9][10][11][12][13]. Typical corrugation and spike domains or plate-like domains have been detected on the surfaces with normal to be parallel or perpendicular to field alignment direction for bulk rare earth permanent magnets [7].…”