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Magnetics Conference, 2000. INTERMAG 2000 Digest of Technical Papers. 2000 IEEE International; 05/2005
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ABSTRACT: Thin-film structures composed of nearly nonmagnetostrictive
single-layer Co<sub>76</sub>Fe<sub>4</sub>B<sub>20</sub> or
magnetostrictive Fe<sub>80</sub>B<sub>20</sub> and
Co<sub>75</sub>Si<sub>15</sub>B<sub>10</sub> amorphous layers have been
deposited on bowed glass substrates using the RF-sputtering technique.
The fabrication procedure induces a postdeposition compressive stress in
the thin-film structure when the sample is retrieved from an arching
device in the sputtering chamber. This results in an induced
magneto-elastic anisotropy that governs the magnetic easy axis of the
film, depending on the sign of the magnetostriction constant of each
layer. Particular attention is paid here to heterogeneous structures
made of bi- or multilayers with magnetic easy axis oriented in a
different direction in each layer. Bulk magnetic properties were
evaluated from hysteresis loops and thermomagnetization measured by
vibrating sample magnetometry (VSM) and quantum interference device
(SQUID) magnetometry. Magnetic domain walls and out-of-plane magnetized
domains were observed by a Kerr imaging system and magnetic force
microscopy. The combination of microstructure and strains induced in the
layers determines the orientation of the observed magnetic anisotropies,
which vary from high in-plane anisotropies up to out-of-plane
orientations for selected films. The results, which provide reassurance
that effective anisotropies are induced in each of the layers, are
discussed in terms of the interactions between magnetic phases with
different induced easy magnetization axes
IEEE Transactions on Magnetics 12/2000; · 1.36 Impact Factor
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ABSTRACT: Magnetic anisotropy was induced in amorphous
Fe<sub>80</sub>B<sub>20</sub> and Co<sub>76</sub>Si<sub>16</sub>B<sub>10
</sub> thin films by growing them on bowed substrates. On releasing the
substrates from the substrate holders, a tensile stress was developed
within the samples which induced a magnetoelastic anisotropy and
modified the domain structure. As a result of it, a magnetic easy axis
parallel to the direction of the stress was developed in positive
magnetostrictive FeB sample whereas in negative magnetostrictive CoSiB
sample the induced easy axis was perpendicular to the direction of
developed stress. To produce magnetic multilayers with crossed
anisotropy, FeB/CoSiB bilayers and FeB/Cu/CoSiB trilayers were grown on
bowed substrates. The magnetic layers in FeB/CoSiB were found to be
coupled, which was reduced by depositing a Cu layer between them in
FeB/Cu/CoSiB trilayer
IEEE Transactions on Magnetics 10/2000; · 1.36 Impact Factor
