TY - JOUR
T1 - Micromagnetic simulation of coercivity of alnico magnets
AU - Won, Hoyun
AU - Hong, Yang Ki
AU - Choi, Minyeong
AU - Yan, Feng
AU - Mankey, Gary J.
AU - Han, Xiao
AU - Lee, Woncheol
AU - Yeo, Chang Dong
AU - Lee, Jongkook
AU - Lee, Taegyu
N1 - Publisher Copyright:
© 2021 IEEE.
PY - 2021
Y1 - 2021
N2 - A branch connecting two neighboring ferromagnetic α1-phase rods is one of the geometric factors that contributes to degradation of alnico's normally high coercivity. This letter investigates the effects of various branch geometries and dimensions on the coercivity of alnico comprehensively by using a micromagnetic simulator when the branch is assumed to be connected in either H- or U-shaped alnico structure and the magnetization reversal of the ferromagnetic α1-phase rod occurs by quasi-coherent rotation or curling. For the H-shaped structure, high coercivity is realized by adopting the middle-branch-connected (MBC) structure with a long branch length and width for quasi-coherent rotation, regardless of the branch thickness. For curling, the same geometric parameters are suggested except for a thick branch thickness. For the U-shaped structure with quasi-coherent rotation, a short branch thickness, width, and length, and MBC position lead a high coercivity. For curling, a short branch width but long length and edge-bridge-connected position result in a high coercivity, regardless of the branch thickness.
AB - A branch connecting two neighboring ferromagnetic α1-phase rods is one of the geometric factors that contributes to degradation of alnico's normally high coercivity. This letter investigates the effects of various branch geometries and dimensions on the coercivity of alnico comprehensively by using a micromagnetic simulator when the branch is assumed to be connected in either H- or U-shaped alnico structure and the magnetization reversal of the ferromagnetic α1-phase rod occurs by quasi-coherent rotation or curling. For the H-shaped structure, high coercivity is realized by adopting the middle-branch-connected (MBC) structure with a long branch length and width for quasi-coherent rotation, regardless of the branch thickness. For curling, the same geometric parameters are suggested except for a thick branch thickness. For the U-shaped structure with quasi-coherent rotation, a short branch thickness, width, and length, and MBC position lead a high coercivity. For curling, a short branch width but long length and edge-bridge-connected position result in a high coercivity, regardless of the branch thickness.
KW - Hard magnetic materials
KW - Magnetic alloys
KW - Micromagnetic models
UR - http://www.scopus.com/inward/record.url?scp=85107216671&partnerID=8YFLogxK
U2 - 10.1109/LMAG.2021.3084899
DO - 10.1109/LMAG.2021.3084899
M3 - Article
AN - SCOPUS:85107216671
SN - 1949-307X
VL - 12
JO - IEEE Magnetics Letters
JF - IEEE Magnetics Letters
M1 - 9444156
ER -