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| Abstract |
In the present study, high sensitive detection of the reversible susceptibility modulation in the magnetic thin film was performed by an LC circuit resonant technique. A flat pick-up coil with the ind...uctance of 0.80 μH and a capacitance of 100 pF construct the LC resonant circuit. The reversible susceptibility x of the magnetic thin film, embedded in the pick-up coil, was measured with a sinusoidal exciting field (H). The out put signal was modulated by applying an orthogonal bias field (H_b). A multilayer sample of [NiFe(100 nm)/Cu(10 nm)]_20, exhibits the most sensitive modulation effect among the fabricated samples. That is, the resonant frequency f_r was decreased from 11.58 MHz (H_b = 0 Oe) to 8.22 MHz (H_b = 7 Oe) at H_<ex> = 2.5 mOe, suggesting the marked increase of x . The value of H_b, which minimizes f_r, is comparable to the anisotropy field. Thus, the observed drastic increase of x can be associated with the compensation of the anisotropy with H_b, as confirmed from the theoretical prediction. The practical out put voltage change of 55%/Oe was realized for the fabricated resonator.show more
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