In order to achieve highy-sensitive detection of magnetic field and refractive index

a magnetic field sensor based on photonic crystal fiber(PCF)is proposed

in which gold nanowires are used as surface plasmon polarization material to achieve more suitable coupling characteristics.Magnetic fluid is employed as the analyte

and the surface plasmon resonance(SPR) technology is realized through the combined effect of the gold nanowires and the magnetic fluid.The influence of the sensor structural parameters on the sensing performance is investigated by the finite element method

and the sensor structure parameters are optimized.The results show that the maximum magnetic field sensitivity of the sensor reaches 806pm/Oe at 120Oe.Additionally

in terms of refractive index sensing

the maximum wavelength sensitivity achieved is 36667nm/RIU.Due to its high sensitivity and stable response to external magnetic field

the proposed SPR-PCF magnetic field sensor demonstrates excellent performance.