TY - JOUR
T1 - Control of in-plane uniaxial anisotropy of CoPd-CaF2 nanogranular films by tandem-sputtering deposition
AU - Naoe, Masayuki
AU - Kobayashi, Nobukiyo
AU - Ohnuma, Shigehiro
AU - Watanabe, Masato
AU - Iwasa, Tadayoshi
AU - Masumoto, Hiroshi
N1 - Publisher Copyright:
© 2014 IEEE.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - In-plane uniaxial anisotropic CoPd-CaF2 nanogranular soft magnetic films for gigahertz applications were prepared using RF tandem-sputtering deposition with substrate revolution. Strong anisotropy with a large anisotropy field exceeding 50 kA/m was achieved in the centrifugal-centripetal direction of the substrate revolution, regardless of the presence or absence of an applied external dc field for induced anisotropy. X-ray pole-figure analysis demonstrated that the crystalline orientation of CoPd111 as a crystallographically magnetic easy axis corresponds to the easy axis of the films. Thus, the soft magnetic properties and uniaxial anisotropy of nanogranular films are determined by both random-magnetocrystalline and shape anisotropies. Complex permeabilities indicated high ferromagnetic resonance frequency exceeding 5GHz with a low Gilbert damping factor of 0.06 for the nanogranular films, and the applied field caused a change in the damping factor. Thus, the magnetic properties of the films can be controlled by the substrate motion and the applied field under tandem-sputtering conditions.
AB - In-plane uniaxial anisotropic CoPd-CaF2 nanogranular soft magnetic films for gigahertz applications were prepared using RF tandem-sputtering deposition with substrate revolution. Strong anisotropy with a large anisotropy field exceeding 50 kA/m was achieved in the centrifugal-centripetal direction of the substrate revolution, regardless of the presence or absence of an applied external dc field for induced anisotropy. X-ray pole-figure analysis demonstrated that the crystalline orientation of CoPd111 as a crystallographically magnetic easy axis corresponds to the easy axis of the films. Thus, the soft magnetic properties and uniaxial anisotropy of nanogranular films are determined by both random-magnetocrystalline and shape anisotropies. Complex permeabilities indicated high ferromagnetic resonance frequency exceeding 5GHz with a low Gilbert damping factor of 0.06 for the nanogranular films, and the applied field caused a change in the damping factor. Thus, the magnetic properties of the films can be controlled by the substrate motion and the applied field under tandem-sputtering conditions.
KW - Soft magnetic materials
KW - anisotropy dispersion
KW - magnetocrystalline anisotropy
KW - nanogranular films
KW - uniaxial anisotropy
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U2 - 10.1109/LMAG.2014.2372691
DO - 10.1109/LMAG.2014.2372691
M3 - Article
AN - SCOPUS:84919798991
VL - 5
JO - IEEE Magnetics Letters
JF - IEEE Magnetics Letters
SN - 1949-307X
M1 - 6960856
ER -