Abstract
The effects of various branches geometry and dimensions such as length, thickness, and width for H-, U-, O-, YH- and YU-shaped alnico structures on coercivity (Hci) using micromagnetic simulation for coherent rotation and curling modes are investigated. The simulation results suggest that the H-shaped structure needs long and short branch length for the coherent rotation and curling, respectively, regardless of branch thickness and width to realize high Hci. Short branch length with thin thickness and short width are recommended for both rotations for the U- and O-shaped structures. Lastly, both Y-shaped structures need branch with long length, thin thickness, and mid-long width for the coherent rotation, but short width for the YH-shaped and mid-long width for the YU-shaped regardless of length and thickness for curling are desired. Furthermore, among the five studied structures, H- or YH-shaped structure for coherent rotation and O-shaped structure for curling are highly recommended for fabrication to realize a high Hci.
Highlights
INTRODUCTIONDue to high saturation magnetization (Ms), small operating temperature coefficient of Ms, and high Curie temperature, alnico permanent magnets (PMs) received much attention. Despite these advantages, its relatively low intrinsic coercivity (Hci) has lessened its market growth in various applications
To observe the effects of such branch on Hci, Ke simulated alnico structure with two different branch positions on Z-axis using micromagnetic simulation and concluded that the branch connected on the bottom or both bottom and top of the rectangular rod, namely U- and O-shaped structure, showed lower Hci than the branch connected on the middle, namely H-shaped
H- and Y-shaped alnico structure increases as LB increases from 10 to 20 nm, while Hci of other structures decreases for Dα1 of 10 nm
Summary
Due to high saturation magnetization (Ms), small operating temperature coefficient of Ms, and high Curie temperature, alnico permanent magnets (PMs) received much attention. Despite these advantages, its relatively low intrinsic coercivity (Hci) has lessened its market growth in various applications.. Due to high saturation magnetization (Ms), small operating temperature coefficient of Ms, and high Curie temperature, alnico permanent magnets (PMs) received much attention.1–3 Despite these advantages, its relatively low intrinsic coercivity (Hci) has lessened its market growth in various applications.. Won investigated the effects of various branch geometries and dimensions on Hci for the H- and U-shaped alnico structures having rectangular α1phase rectangular rods and found their optimal branch dimensions.. Won investigated the effects of various branch geometries and dimensions on Hci for the H- and U-shaped alnico structures having rectangular α1phase rectangular rods and found their optimal branch dimensions.5 These studies investigated the effect of the branch on the α1-phase rectangular rod, not the cylindrical rod, as observed experimentally.. This paper investigates the effects of branch length (LB), thickness (TB), and width (WB) on Hci for five structures, including H-, U-, O-, YU-, and YH-structures, using a micromagnetic simulator when α1-phase cylindrical rod experiences coherent rotation and curling
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