In-situ magnetic force microscopy analysis of magnetization and demagnetization behavior in Al 3+ substituted Sr-hexaferrite
作者： F. Rhein , T. Helbig , V. Neu , M. Krispin , O. Gutfleisch
DOI: 10.1016/J.ACTAMAT.2017.12.010
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摘要: Abstract The sintering temperature of an Al3+ substituted Sr-hexaferrite composite was systematically varied from 1180 °C to 1280 °C resulting in different microstructures. grain size found range a few hundred nanometers several micrometers depending on Al content and temperature. Adding powder commercial increased the coercivity 360 mT 470 mT, at same time, decreasing remanence 350 mT 305 mT. Magnetization demagnetization processes thermally demagnetized state (TDS) DC-demagnetized (DCD) have been investigated by in-situ magnetic force microscopy (MFM) under field. From surface domain contrast polarization derived which quantitatively matches global i.e. bulk obtained superconducting quantum interface device (SQUID) magnetometry. shape initial curve DCD were correlated with MFM data revealing distinctly magnetization behavior size. presented results enable better understanding local nucleation mechanisms, influences pinning centers further opportunities improve rare earth (RE) free permanent magnets based ferrites.
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