Tensor Nature of Permeability and Its Effects in Inductive Magnetic Devices

Author

Li, Liangliang ; Lee, Dok Won ; Wang, Shan X. ; Hwang, Kyu-Pyung ; Min, Yongki ; Mao, Ming ; Schneider, Thomas ; Bubber, Randhir

Author_Institution

Mater. Sci. & Eng. Dept., Stanford Univ., CA

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2373

Lastpage

2375

Abstract

The tensor nature of the permeability of soft magnetic materials with an in-plane anisotropy was investigated. Using tensor transformation, the measured permeability was proportional to cos²alpha, where alpha is the angle between the external exciting magnetic field and hard axis of magnetic material, which was proven by experimental data for thin-film materials CoFeHfO and CoTaZrTb. A new type of inductor was designed and simulated by Ansoft Maxwell 3-D to study the effects of the tensor nature of the permeability in the simulation of inductors. It is important to appropriately account for the tensor nature of the permeability of soft magnetic materials in inductive device simulation to establish realistic device models. A magnetic integrated inductor with extremely low DC resistance (<9mOmega) was fabricated. Its high-frequency performance was measured and compared to HFSS simulation using appropriate tensor permeability

Keywords

cobalt alloys; cobalt compounds; ferromagnetic materials; inductors; iron compounds; magnetic anisotropy; magnetic cores; magnetic permeability; magnetic thin films; soft magnetic materials; tantalum alloys; tensors; terbium alloys; zirconium alloys; Ansoft Maxwell 3-D simulation; CoFeHfO; CoTaZrTb; DC resistance; in-plane anisotropy; inductive magnetic devices; magnetic core; magnetic integrated inductor; magnetic material hard axis; magnetic thin films; permeability tensor; soft magnetic materials; tensor transformation; Anisotropic magnetoresistance; Magnetic anisotropy; Magnetic devices; Magnetic field measurement; Magnetic films; Magnetic materials; Permeability measurement; Soft magnetic materials; Tensile stress; Thin film inductors; Integrated inductor; permeability; tensor;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.892585

Filename

4202825