| Summary: | 碩士 === 國立中興大學 === 物理學系所 === 99 === In this study, we report the ferromagnetic resonace (FMR) of Ni3Fe nanowire array by using the microwave (MW) reflectometry. The nanowire array with the porosities of 28 %、45 %、100 % and 6 % was grown by electrodeposition into the pores of anodic aluminum oxide membranes and commercial film, respectively. For nanowires grown on the anodic aluminum oxide membranes, their diameter is about 50 nm and the length is 3 μm. For those grown on the commercial film, the diameter is 200 nm and the length is 4 μm. The sample is placed on the dielectric part of a SMA connector and fixed by a 1-mm-wide copper ribbon which leads a short-loop detection. We applied the MW signal with the frequency ranging from 1 GHz to 13 GHz and detected magnitudes of the reflection signal at the magnetic field from 4.5 kOe to -4.5 kOe by using a vector network analyzer. The angle between the growth direction of nanowires and the magnetic field is from 0° to 90°.
From the result, we observed that the FMR depends on the frequency-field values. The magnetic field where FMR is existed increases as the MW frequency increases.
When the angle between magnetic field and the growing direction of nanowires increases, the value of the magnetic field related to the FMR decreases., As the angle is changed, the lager variety of the resonance magnetic field of the sample is, the smaller porosity of the sample is.
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