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Studies of the Room-Temperature Multiferroic Pb(Fe0.5Ta0.5)0.4(Zr0.53Ti0.47)0.6O3: Resonant Ultrasound Spectroscopy, Dielectric, and Magnetic Phenomena.

Schiemer J, Carpenter MA, Evans DM, Gregg JM, Schilling A, Arredondo M, Alexe M, Sanchez D, Ortega N, Katiyar RS, Echizen M, Colliver E, Dutton S, Scott JF - Adv Funct Mater (2014)

Bottom Line: Thermal degradation makes it impossible to measure elastic behavior up to this temperature, however.The former is interpreted as being due to a magnetic ordering transition and the latter is interpreted as a hysteretic regime of mixed rhombohedral and orthorhombic structures.These observations are used to suggest that the three order parameters in PZTFT are strongly coupled.

View Article: PubMed Central - PubMed

Affiliation: Department of Earth Sciences, University of Cambridge Cambridge, CB2 0EQ, UK.

ABSTRACT

Recently, lead iron tantalate/lead zirconium titanate (PZTFT) was demonstrated to possess large, but unreliable, magnetoelectric coupling at room temperature. Such large coupling would be desirable for device applications but reproducibility would also be critical. To better understand the coupling, the properties of all 3 ferroic order parameters, elastic, electric, and magnetic, believed to be present in the material across a range of temperatures, are investigated. In high temperature elastic data, an anomaly is observed at the orthorhombic mm2 to tetragonal 4mm transition, T ot = 475 K, and a softening trend is observed as the temperature is increased toward 1300 K, where the material is known to become cubic. Thermal degradation makes it impossible to measure elastic behavior up to this temperature, however. In the low temperature region, there are elastic anomalies near ≈40 K and in the range 160-245 K. The former is interpreted as being due to a magnetic ordering transition and the latter is interpreted as a hysteretic regime of mixed rhombohedral and orthorhombic structures. Electrical and magnetic data collected below room temperature show anomalies at remarkably similar temperature ranges to the elastic data. These observations are used to suggest that the three order parameters in PZTFT are strongly coupled.

No MeSH data available.


Related in: MedlinePlus

Isothermal magnetization of PZTFT4 at 5 K (black), 150 K (red), and 300 K (blue). The low field region is shown in greater detail as an inset.
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fig03: Isothermal magnetization of PZTFT4 at 5 K (black), 150 K (red), and 300 K (blue). The low field region is shown in greater detail as an inset.

Mentions: The isothermal magnetization measurements, M(H), Figure3, are consistent with the magnetic ground states described above. At T ≥ 150 K, the magnetization saturates to a low value on application of a small magnetic field. The shape of M(H) is characteristic of ferromagnetic or ferrimagnetic ordering, although the small saturation value, 0.2–0.3 μB/Fe (0.65–0.97 emu/g), is significantly less than would be anticipated for a fully polarized Fe3+ system (MSAT = gS = 5 μB/Fe). At 5 K and low field (μ0H < 1 T) the shape of the M(H) changes dramatically and irreversibility is still observed. In higher fields, however, the magnetization does not saturate and is still increasing at the limiting field of 5 T. The shape of the low T isothermal magnetization is consistent with the formation of a spin or cluster glass on cooling T < Tf.


Studies of the Room-Temperature Multiferroic Pb(Fe0.5Ta0.5)0.4(Zr0.53Ti0.47)0.6O3: Resonant Ultrasound Spectroscopy, Dielectric, and Magnetic Phenomena.

Schiemer J, Carpenter MA, Evans DM, Gregg JM, Schilling A, Arredondo M, Alexe M, Sanchez D, Ortega N, Katiyar RS, Echizen M, Colliver E, Dutton S, Scott JF - Adv Funct Mater (2014)

Isothermal magnetization of PZTFT4 at 5 K (black), 150 K (red), and 300 K (blue). The low field region is shown in greater detail as an inset.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4379905&req=5

fig03: Isothermal magnetization of PZTFT4 at 5 K (black), 150 K (red), and 300 K (blue). The low field region is shown in greater detail as an inset.
Mentions: The isothermal magnetization measurements, M(H), Figure3, are consistent with the magnetic ground states described above. At T ≥ 150 K, the magnetization saturates to a low value on application of a small magnetic field. The shape of M(H) is characteristic of ferromagnetic or ferrimagnetic ordering, although the small saturation value, 0.2–0.3 μB/Fe (0.65–0.97 emu/g), is significantly less than would be anticipated for a fully polarized Fe3+ system (MSAT = gS = 5 μB/Fe). At 5 K and low field (μ0H < 1 T) the shape of the M(H) changes dramatically and irreversibility is still observed. In higher fields, however, the magnetization does not saturate and is still increasing at the limiting field of 5 T. The shape of the low T isothermal magnetization is consistent with the formation of a spin or cluster glass on cooling T < Tf.

Bottom Line: Thermal degradation makes it impossible to measure elastic behavior up to this temperature, however.The former is interpreted as being due to a magnetic ordering transition and the latter is interpreted as a hysteretic regime of mixed rhombohedral and orthorhombic structures.These observations are used to suggest that the three order parameters in PZTFT are strongly coupled.

View Article: PubMed Central - PubMed

Affiliation: Department of Earth Sciences, University of Cambridge Cambridge, CB2 0EQ, UK.

ABSTRACT

Recently, lead iron tantalate/lead zirconium titanate (PZTFT) was demonstrated to possess large, but unreliable, magnetoelectric coupling at room temperature. Such large coupling would be desirable for device applications but reproducibility would also be critical. To better understand the coupling, the properties of all 3 ferroic order parameters, elastic, electric, and magnetic, believed to be present in the material across a range of temperatures, are investigated. In high temperature elastic data, an anomaly is observed at the orthorhombic mm2 to tetragonal 4mm transition, T ot = 475 K, and a softening trend is observed as the temperature is increased toward 1300 K, where the material is known to become cubic. Thermal degradation makes it impossible to measure elastic behavior up to this temperature, however. In the low temperature region, there are elastic anomalies near ≈40 K and in the range 160-245 K. The former is interpreted as being due to a magnetic ordering transition and the latter is interpreted as a hysteretic regime of mixed rhombohedral and orthorhombic structures. Electrical and magnetic data collected below room temperature show anomalies at remarkably similar temperature ranges to the elastic data. These observations are used to suggest that the three order parameters in PZTFT are strongly coupled.

No MeSH data available.


Related in: MedlinePlus