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(a) SAW device with Co rectangles spaced by the wavelength of the SAW. (b) Temperature dependence of the resonance observed via insertion loss at room temperature and 30 K. (c) Fundamental resonance at 91.75 MHz measured via transmission across the two IDTs at room temperature using frequency modulation. (d) Time dependence of the magnetization at zero applied field. is the minimum strain required to switch the magnetization into the hard axis direction. For a strain wave of amplitude , where , the magnetization switches into the hard axis direction for the time period represented by the hatched rectangles.
(a) Hard axis magnetization signal as a function of applied voltage, normalized to the saturation magnetization along the hard axis direction at easy axis applied fields of and at . The dashed lines are guides to the eye. The solid line is the expected zero field behavior from Eq. (3). (b) Reversibility of magnetization signal with increasing and decreasing voltage. (c) Turn-on voltage as a function of applied field along the easy axis (symbols) together with the expected slope (solid line) calculated from the free energy minimization.
Exchange bias vs temperature (open triangles, left axis) and turn-on voltage (squares, right axis) vs temperature. The inset shows the turn-on voltage as a function of exchange bias (squares) together with the expected linear dependence (solid line) calculated from free energy minimization.
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