Study of shunt impedance of the FT3L magnetic alloy core

Nomura, Masahiro  ; Yamamoto, Masanobu   ; Shimada, Taihei ; Tamura, Fumihiko   ; Omori, Chihiro*; Toda, Makoto*; Hasegawa, Katsushi*; Hara, Keigo*; Yoshii, Masahito*

We are successful in increasing the shunt impedance of the MA cores by applying a transverse magnetic field during annealing. In this paper, we discuss the effects of transverse field annealing on the MA core shunt impedance by comparing two kinds of MA cores, those are the FT3M core that is annealed without any magnetic fields and the FT3L core that is annealed with a transverse magnetic field. We also discuss the shunt impedance of the MA core when the magnetization processes are governed by ideal magnetization rotations. To understand the ribbon thickness and the permeability dependences of the shunt impedance intuitively, we represent the shunt impedance as the resistance of the closed rectangular loop through which the eddy current flows.