Properties of Mn-Implanted BaTiO_3, SrTiO_3, and KTaO_3

摘要

Mn ion implantation into single-crystal BaTiO_3(K), SrTiO_3, or KTaO_3(Ca) was investigated for its effects on the magnetic properties of these materials. Following annealing at 700 deg C, the Mn implantation was found to induce ferromagnetic behavior for most of the concentration range investigated. For BaTiO_3, Mn implantation produced magnetic ordering temperatures near 300 K with coercivities <= 70 Oe. The magnetization/temperature plots showed a non-Brillouin-shaped curve. No secondary phases were detected by high resolution X-ray diffraction. The results are consistent with theoretical predictions for transition metal doping of BaTiO_3. The same basic trends were observed for both SrTiO_3 and KTaO_3, with the exception that at high Mn concentrations (approx 5 atom percent) the SrTiO_3 was no longer ferromagnetic.