NDLI: Planar Alignment of Magnetic Microdisks in Composites Using Rotating Fields

Content Provider	IEEE Xplore Digital Library
Author	Han Song Mingyang Tan Walker, T.W. Jander, A. Dhagat, P.
Copyright Year	1965
Abstract	Soft magnetic composites with aligned anisotropic magnetic particles can have properties not achievable in traditional single-phase materials. These materials are promising for high-frequency inductor and antenna applications. Composites with uniaxial anisotropy, achieved by aligning rod-shaped particles in a constant magnetic field, have previously been reported. In this paper, we discuss the advantages and conditions for realizing composites with planar anisotropy, by aligning disk-shaped particles in a rotating magnetic field. We use Ni-Fe microdisks in a UV-curable matrix as the study system, and present an experimental and theoretical investigation of their alignment under a rotating field in a viscous fluid. The theoretical model is based on Stokes flow of an isolated magnetic oblate ellipsoidal particle in a rotating magnetic field and enables an understanding of the hydrodynamics of the microdisk alignment process. Alignment rate under varying aligning field strength, field rotation frequency, and fluid viscosity is observed using optical microscopy, and characterized by the magnetic properties resultant in the composite. Good agreement is found between measured results and the model. Our work demonstrates for the first time that planar anisotropy in a magnetic composite can be tuned by precise control of aligning field strength and duration, and provides the insight necessary to engineer the alignment dynamics for achieving high-frequency operation.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	5
Page Count	5
File Size	1519417
File Format	PDF
ISSN	00189464
Volume Number	51
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic resonance Anisotropic magnetoresistance Magnetic fields Viscosity Magnetic field measurement Magnetic anisotropy Soft Magnetic Composite Magnetic Particle Alignment Planar Magnetic Anisotropy soft magnetic composite Magnetic particle alignment planar magnetic anisotropy
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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