NDLI: Soft Thin Films for Flux Concentrators

Content Provider	IEEE Xplore Digital Library
Author	Trindade, I.G. Oliveira, J. Fermento, R. Sousa, J.B. Cardoso, S. Freitas, P.P. Raghunathan, A. Snyder, J.E.
Copyright Year	1965
Abstract	In this paper, we describe the development of multilayer (ML) thin films suitable for flux concentrators (FC). We prepared ML films having magnetic thicknesses n middot t_F in the range of 400 Aringto 3000 Aringby ion beam deposition (IBD). The films exhibit Ruderman-Kittel Kasuya-Yosida (RKKY) long range antiferromagnetic (AF) coupling through very thin Ru interlayers. We prepared two types of samples: (CoFeBt_F/Rut_Ru)xn and (NiFet_F/Rut_Ru)xn, where CoFeB is (Co₇₀Fe₃₀)_80at%B_20at% and NiFe is Ni₈₁Fe₁₉. The former has good thermal stability and high magnetic moment while the latter, previously reported, has poor thermal stability and low spontaneous magnetic moment. We discuss the magnetic properties of the films in terms of the remanent magnetic moment M_r and saturation field H_s. Despite having higher spontaneous magnetic moment of 1200 emu/cm³, (CoFeB/Ru)xn films with adequate magnetic properties for sensor-in-gap devices with FC could not be prepared. By contrast, samples consisting of NiFe350 Aring/(Ru7 Aring /NiFe350 Aring)x7 exhibited suitable magnetic properties. We lithographically patterned the films into FC and test structures to investigate their magnetization processes by anisotropic magnetoresistance (MR) measurements. The MR curves indicate magnetization processes by uniform rotation and show absence of hysteresis.
Sponsorship	IEEE Magnetics Society
Starting Page	168
Ending Page	171
Page Count	4
File Size	317773
File Format	PDF
ISSN	00189464
Volume Number	45
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transistors Magnetic films Magnetic moments Magnetic properties Iron Thermal stability Magnetization processes Anisotropic magnetoresistance Magnetic multilayers Magnetic anisotropy RKKY Flux concentrator multilayer
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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