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AFM images (2 × 2 μm2) for (a) a flexible PET substrate and (b) an Fe81Ga19/PET film. The color contrast (dark to bright) for the height scale corresponds to 40 nm.
(a) Hysteresis loops and initial magnetization curves for flexible Fe81Ga19/PET films with a magnetic field applied along the easy axis (ϕ = 0°) and the hard axis (ϕ = 90°). (b) Squareness and coercive field as a function of the field orientation ϕ for Fe81Ga19/PET exhibit a uniaxial symmetry about the easy or hard axes. The field orientation ϕ is defined in the inset of (a).
Hysteresis loops for Fe81Ga19/PET obtained under various external strains using different measuring configurations, (a) Magnetic field H parallel to the uniaxial anisotropy Ku and a tensile strain +ɛ (outward bending of PET substrates) applied perpendicular to Ku , (b) H parallel to Ku and a compressive strain –ɛ (inward bending) perpendicular to Ku , (c) H perpendicular to Ku and +ɛ parallel to Ku , and (d) H perpendicular to Ku and −ɛ parallel to Ku .
(a) Summary for the strain dependence of squareness with the magnetic field applied along the easy and hard axes. (b) Calculated squareness of hysteresis loops as a function of the strain-induced uniaxial anisotropy Ke/Ms using the Stoner-Wohlfarth model (dashed lines) and our modified one (solid lines with symbols). Calculated hysteresis loops under various Ke/Ms for the magnetic field (c) parallel and (d) perpendicular to Ku . The magnetic field and anisotropy geometries used for numerical calculations are shown in the inset of (b). Using this definition, the experimental results can be accordingly revised to the squareness as a function of Ke/Ms , as plotted in the inset of (a).
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