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lmcr銅蟲 (小有名氣)
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[求助]
BiFeO3 薄膜的磁電系數(shù)是多大？ 已有1人參與
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| 請(qǐng)問到目前為止，BiFeO3或者doped BFO 的磁電系數(shù)有多大？ |
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【答案】應(yīng)助回帖
感謝參與，應(yīng)助指數(shù) +1
mjx150: 感謝交流 2014-02-24 09:39:54
mjx150: 感謝交流 2014-02-24 09:39:54
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In-plane dielectric and magnetoelectric studies of BiFeO3[Advanced Materials Physics] Ashok Kumar, J. F. Scott, R. Martínez, G. Srinivasan, and R. S. Katiyar The in-plane temperature dependent dielectric behavior of BiFeO3 (BFO) as-grown thin films shows diffuse but prominent phase transitions near 450 (±10) K and 550 K with dielectric-loss temperature dependences that suggest skin layer effects. The 450 K anomalies are near the “transition” first reported by Polomska et al. [Phys. Status Solidi 23, 567 (1974)]. The 550 K anomalies coincide with the surface phase transition recently reported by Xavi et al. [Phys. Rev. Lett. 106, 236101 (2011)]. In addition, anomalies are found at low temperatures: After several experimental cycles the dielectric loss shows a clear relaxor-like phase transition near what was previously suggested to be a spin reorientation transition (SRT) temperature (～201 K) for frequencies 1 kHz < f < 1 MHz which follow a nonlinear Vogel–Fulcher (V–F) relation; an additional sharp anomaly is observed near ～180 K at frequencies below 1 kHz. As emphasized recently by Cowley et al. [Adv. Phys. 60, 229 (2011)], skin effects are expected for all relaxor ferroelectrics. Using planar interdigital electrodes, Kumar et al. present experimental data and a theoretical model for the in-plane longitudinal and transverse direct magnetoelectric (ME) coefficients. Reasonably good ME coefficients (～300 mV/Oe cm in transverse and 2 V/Oe cm in longitudinal direction) are measured. Understanding of the in-plane phase transitions and ME behaviour may be helpful to design nanoscale and interfacial devices with high surface to volume ratios. Phys. Status Solidi A (2012) DOI 10.1002/pssa.201228154 |
2樓2013-11-24 10:34:07
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