Magnetic properties of Co- and Mn-implanted BaTiO3, SrTiO3 and KTaO3 |
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| Authors: | J. S. Lee Z. G. Khim Y. D. Park D. P. Norton N. A. Theodoropoulou A. F. Hebard J. D. Budai L. A. Boatner S. J. Pearton R. G. Wilson |
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| Affiliation: | a School of Physics, Seoul National University, Seoul 151-747, South Korea;b Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA;c Department of Physics, University of Florida, Gainesville, FL 32611, USA;d Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;e Consultant, Stevenson Ranch, CA 91381, USA |
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| Abstract: | Implantation of Co or Mn into single-crystal BaTiO3(K), SrTiO3 or KTaO3(Ca), followed by annealing at 700 °C, produced ferromagnetic behavior over a broad range of transition metal concentrations. For BaTiO3, both Co and Mn implantation produced magnetic ordering temperatures near 300 K with coercivities 70 Oe. The M–T plots showed either a near-linear decrease of magnetization with increasing temperature for Co and a non-Brillouin shaped curve for Mn. No secondary phases were detected by high-resolution X-ray diffraction. The same basic trends were observed for both SrTiO3 and KTaO3, with the exception that at high Mn concentrations (5 at.%) the SrTiO3 was no longer ferromagnetic. Our results are consistent with recent reports of room temperature ferromagnetism in other perovskite systems (e.g. LaBaMnO3) and theoretical predictions for transition metal doping of BaTiO3 [Nakayama et al., Jap. J. Appl. Phys. 40 (2001) L1355]. |
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