This letter reports the structural, dielectric, ferroelectric, and magnetic properties of Fe substituted SrTiO3 thin films in room temperature. The structural data obtained from x-ray diffraction indicates that (Fex,Sr1−x)TiO3, the so called FST, transforms from pseudocubic to tetragonal structures with increase of the Fe content in SrTiO3 thin films, featuring the ferroelectricity, while vibrating sample magnetometer measurements show magnetic hysteresis loops for the samples with low iron contents indicating their ferromagnetism. The characterized ferroelectricity and ferromagnetism confirms strong multiferroitism of the single phase FST thin films in room temperature. Also, an FST thin film metal-insulator-metal multiferroic capacitor has been fabricated and characterized in microwave frequencies between 10 MHz and 5 GHz. A capacitor based on Fe0.1Sr0.9TiO3 with a thickness of 260 nm shows a high electric tunability of 18.6% at 10 V and a maximum magnetodielectric value of 1.37% at 0.4 mT with a loss tangent of 0.021 at 1 GHz. This high tuning and low loss makes this material as a good candidate for frequency agile microwave devices such as tunable filters, phase shifters, and antennas.
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8 September 2014
Research Article|
September 09 2014
Room temperature multiferroic properties of (Fex, Sr1−x)TiO3 thin films
Kyoung-Tae Kim;
Kyoung-Tae Kim
Department of Electrical and Computer Engineering,
University of Florida
, Gainesville, Florida 32611, USA
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Cheolbok Kim;
Cheolbok Kim
Department of Electrical and Computer Engineering,
University of Florida
, Gainesville, Florida 32611, USA
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Sheng-Po Fang;
Sheng-Po Fang
Department of Electrical and Computer Engineering,
University of Florida
, Gainesville, Florida 32611, USA
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Yong-Kyu Yoon
Yong-Kyu Yoon
a)
Department of Electrical and Computer Engineering,
University of Florida
, Gainesville, Florida 32611, USA
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a)
e-mail: ykyoon@ece.ufl.edu
Appl. Phys. Lett. 105, 102903 (2014)
Article history
Received:
May 08 2014
Accepted:
August 26 2014
Citation
Kyoung-Tae Kim, Cheolbok Kim, Sheng-Po Fang, Yong-Kyu Yoon; Room temperature multiferroic properties of (Fex, Sr1−x)TiO3 thin films. Appl. Phys. Lett. 8 September 2014; 105 (10): 102903. https://doi.org/10.1063/1.4894850
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