Magneto-capacitance effects in epitaxial TbMn2O5 thin films

作者：Song Jong Hyun^*; Kang Sun Hee; Kim Ill Won; Jeong Yoon Hee; Koo Tae Yeong

来源：Journal of the Korean Physical Society, 2012, 61(9): 1386-1389.

DOI：10.3938/jkps.61.1386

• Epitaxial TbMn2O5 thin films
• Magneto-capacitance effect (MCE)
• Pulsed laser deposition (PLD)
• Anisotropic substrate strain effect

Thin films of TbMn2O5 (TMO) were grown on Nb-doped TiO2 (110) substrates by using pulsed laser deposition to investigate the effects of substrate-induced strains on the multiferroic properties observed in the bulk phase. The epitaxial qualities of the films were confirmed by using X-ray azimuthal angle scans of the TMO (201) and the TiO2 (111) reflections. TMO films were magnetically ordered at temperatures below T (N) a parts per thousand 43 K, consistent with the value observed in the bulk. A maximum negative magneto-capacitance effect of about 10% at 8 T was detected near 16 K, where the dielectric constant changed rapidly with a step-like anomaly. Magnetization-induced ferroelectric phases in the epitaxial thin films appear to become destabilized at temperatures below T (N) due to substrate-induced tensile strains causing a weakening of the magnetic exchange interactions.

• 出版日期2012-11