Magnetic and ferroelectric properties of Fe doped SrTiO3-δ films

Recent interest in SrTiO3 stems from its wide applicability in microwave devices based on the tunable characteristics of dielectric constant in the microwave frequency range. It is obvious that for any such application, SrTiO3 should have a ferroelectric Curie temperature (TC) close to room temperat...

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Bibliographic Details
Main Authors: Kumar, A Sendil, Suresh, P, Kumar, M Mahesh, Srikanth, H, Post, M L, Sahner, Kathy, Moos, Ralf, Srinath, S
Format: Conference Proceeding
Language:English
Subjects:
Antiferromagnetism
Curie temperature
Ferroelectric domains
Ferroelectric materials
Ferroelectricity
Frequency ranges
Hysteresis loops
Magnetic properties
Magnetism
Microwave frequencies
Physics
Room temperature
Strontium titanates
Temperature
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Summary:Recent interest in SrTiO3 stems from its wide applicability in microwave devices based on the tunable characteristics of dielectric constant in the microwave frequency range. It is obvious that for any such application, SrTiO3 should have a ferroelectric Curie temperature (TC) close to room temperature or higher. By inducing strains by chemical substitutions, it was possible to obtain TC as high as 200°C in SrTiO3 modified with Fe4+. Hysteresis loops obtained confirms the presence of ferroelectric domains. Two apparent transitions, one at ~200 °C and another ~300 °C were seen in ε′, which are replicated as sharp drops in resistivity curves. These temperatures far exceed the TCs reported in the literature till now and could open new avenues for innumerable other applications for SrTiO3. The magnetic properties of Fe doped SrTiO3 are also investigated. Low doping of Fe exhibits simple antiferromagnetic behaviour.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/200/9/092010