Observation of Patterns by Magnetic Force Microcopy in Fe-Alloys with Shape Memory Effect
NORTH CAROLINA STATE UNIV AT RALEIGH ANALYTICAL INSTRUMENTATION FACILITY
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In this study, we investigated the magnetic domains of a FeMnSiNiCr stainless steel sample using Magnetic Force Microscope MFM. We compared the magnetic patterns obtained by scanning the sample with three coated probes with different magnetic properties Medium magnetic moment MM, low magnetic moment LM, and low coercivity LC. The probe-surface separation was varied between 25 to 300 nm in order to quantify the magnetic microstructure of the sample. A simple model for the probe-sample interaction was used to interpret the contrast change as a function of the probe-surface separation. The experiment showed that the average maximum frequency decreases with the probe-surface separation and the intensity of the frequency is the strongest for the MM probe. X-ray diffraction experiments were used to identify the different phases present in the sample. The X-ray diffraction experiments together with the MFM showed that alpha-phase islands surrounded by a gamma-phase matrix are responsible for the magnetic properties of the sample.
- Properties of Metals and Alloys
- Electricity and Magnetism
- Solid State Physics