High-frequency giant magneto-reactance effect in a composite wire LC-resonator

The BeCu/Insulator/CoP composite wires were prepared by electroless-deposition on insulated BeCu wire. The composite wire constructs a serial LC resonant element by itself. Due to the LC resonance, very large high-frequency magneto-reactance effect is observed at near the LC resonance frequency, and the maximal magneto-reactance ratio for the composite wire with length of 5 cm is 1.08×10⁷% at 58924500 Hz. The LC resonance frequency decreases with the increasing length of the composite wire. The practical working frequency, at which the very large high-frequency magneto-reactance effect is observed, can be controlled through controlling the LC resonance frequency. The LC resonance mechanism is also analyzed. Supported by the National Natural Science Foundation of China (Grant No. 20575022), the Emphasis Project of Shanghai Nanotechnology Promotion Center, China (Grant No. 0652nm036) and the Opening Foundation of the Key Laboratory for Magnetism and Magnetic Material of the Education Ministry of China, Lanzhou University (Grant No. LZ013)