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(a) MOKE loop for Fe/Cr/Fe layers with the magnetic field applied in the Fe  direction. (b) Optical microscope image of a coplanar-waveguide-shape with signal (S) and ground (G) lines. and are the input and the reflected voltages, respectively. (c) Magnetic field-induced FMR spectra measured at various magnetic fields. The magnetic field was applied along the Fe  direction.
(a) Calculation and (b) experimental results of the normalized MOKE loops for Fe/Cr/Fe layers. (c) Calculated resonant frequencies for the acoustic mode (open circles) and the optical mode (solid circles). (d) Experimental result of the magnetic field dependence of the peak frequencies for magnetic field-induced FMR measurement. The magnetic field was applied along the Fe  direction. The arrows denote the alignment of the two magnetization vectors.
(a) Magnetoresistance curve for a CPP-GMR device consisting of Fe/Cr/Fe layers. The magnetic field was applied in the Fe  direction. (b) Measurement setup for STT-FMR in the CPP-GMR device. (c) STT-FMR spectra measured at various magnetic field angles . The inset of the figure illustrates the relationship between the pillar shape and . The magnetic field was fixed at 1760 Oe. (d) STT-FMR spectra measured at various magnetic fields. was fixed at 55°.
(a) Magnetic field dependence of the resonant frequencies for STT-FMR at . Solid and open squares are peak frequencies of the optical and the acoustic modes, respectively. Solid and dashed lines represent the calculated and at . The calculated results for two uncoupled Fe layers with (dotted line) and (dashed-dotted line) are also shown. (b) Calculated result of the relative angle between two Fe layers as a function of external magnetic field.
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