NDLI: FMR study on spin-sprayed Ni-Zn-Co ferrite films with high permeability usable for GHz noise suppressors

Content Provider	IEEE Xplore Digital Library
Author	Kondo, K. Chiba, T. Yoshida, S. Okamoto, S. Shimada, Y. Matsushita, N. Abe, M.
Copyright Year	1965
Abstract	We previously revealed that spin sprayed Ni-Zn ferrite films had a weak in-plane uniaxial magnetic anisotropy induced parallel to the liquid flow direction during the spin spraying. Adding a small amount of Co to the films, we made the uniaxial magnetic anisotropy definitely strong. The imaginary part of the complex permeability (/spl mu/=/spl mu/'-j/spl mu/'') of the Co-containing films measured in the remanence state exhibited a dual step-like dispersion. In order to reveal the influence of magnetic anisotropy of the films on the magnetic resonance, we deposited, in this study, films #1 (Ni/sub 0.17/Zn/sub 0.22/Fe/sub 2.61/O/sub 4/) and #2 (Ni/sub 0.19/Zn/sub 0.20/Co/sub 0.03/Fe/sub 2.58/O/sub 4/) by spin spray ferrite plating at 90/spl deg/C. The imaginary permeability in the remanence state of the film #1 (which exhibited no definite in-plane magnetic anisotropy) had a maximum at about 450 MHz, which increased with increasing external dc magnetic field, H/sub dc/ in the range of 1-3 GHz to give a similar spectrum to that of the film #2. The resonance field, H/sub R/ of the film #2 under H/sub dc/ of 1-2 kOe, which was strong enough to saturate the magnetization, exhibited a prominent in-plane angular dependence, while H/sub R/ of the film #1 exhibited a very weak angular dependence. The difference between the maximum and the minimum values of H/sub R/ for the film #2 was about 60 Oe. This means that the film #2 consists of two regions, one with a crystalline anisotropy field having an in-plane isotropic distribution due to the cubic spinel structure, and the other with an induced uniaxial anisotropy field, H/sub k/ of about 60 Oe. Assigning H/sub k/ of 60 Oe, we calculated the natural resonance frequency, f/sub r/ as 1.6 GHz. This value approximately coincided with that of the higher frequency step of /spl mu/'' for the film #2 in the remanence state. This suggests that the magnetic loss in the remanence state for the films like #2 (which exhibit prominent uniaxial anisotropy induced in film plane) is ascribed to the two regions described above.
Sponsorship	IEEE Magnetics Society
Starting Page	3463
Ending Page	3465
Page Count	3
File Size	165390
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
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 Ferrite films Permeability Magnetic films Magnetic anisotropy Remanence Spraying Anisotropic magnetoresistance Zinc Iron Ni-Zn(-Co) ferrite film Complex permeability ferrite plating ferromagnetic resonance (FMR)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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