Magnetic nanocluster formation of Fe ions embedded in SiO2and Al2O3substrates

ABSTRACTResearch focus in recent years on magnetic behaviour of transition metal (TM) ions embedded in semiconductors has shifted from intrinsic effects to extrinsic effects such as the formation of nanoclusters of the TM ions and the influence of the host matrix on their magnetic behaviour. Our studies, using conversion electron Mössbauer Spectroscopy and magnetization measurements, on SiO2and Al2O3substrates implanted with 4 at. % Fe, show ferromagnetic behaviour of α-Fe clusters in amorphous SiO2, but α-Fe2O3clusters displaying superparamagnetic relaxation in crystalline Al2O3.

Impact of magnetization and hyperfine field distribution on high magnetoelectric coupling strength in BaTiO3–BiFeO3 multilayers

Using conversion electron Mössbauer spectroscopy, interesting correlations of hyperfine field, magnetization, polarization, and magnetoelectric coefficient could be established.