Anomalous room temperature magnetoresistance in brownmillerite Ca 2 Fe 2 O 5

We demonstrate the hitherto unreported field induced magnetoresistance in wet chemical synthesized bulk polycrystalline brownmillerite Ca 2 Fe 2 O 5 . A magnetoresistance of 12% is observed at room temperature, well below its antiferromagnetic transition temperature of 775 K. The variation in resist...

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Bibliographic Details
Published in:RSC advances 2015, Vol.5 (112), p.92549-92553
Main Authors: Dhankhar, Suchita, Gupta, Kapil, Bhalerao, Gopal, Shukla, Neeraj, Chandran, Maneesh, Francis, Bellarmine, Tiwari, Brajesh, Baskar, K., Singh, Shubra
Format: Article
Language:English
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Summary:We demonstrate the hitherto unreported field induced magnetoresistance in wet chemical synthesized bulk polycrystalline brownmillerite Ca 2 Fe 2 O 5 . A magnetoresistance of 12% is observed at room temperature, well below its antiferromagnetic transition temperature of 775 K. The variation in resistivity with increasing and decreasing magnetic field shows a significant memory effect. When synthesized in a nanostructured form it exhibits weak ferromagnetism due to the appearance of an Fe oxide phase, besides exhibiting a shift to a higher antiferromagnetic Néel temperature of 820 K. Spectroscopic investigations (X-ray photoelectron and Raman spectroscopy) as well as magnetic measurements have been employed to investigate the above behavior of brownmillerite Ca 2 Fe 2 O 5 .
ISSN:2046-2069
2046-2069
DOI:10.1039/C5RA16955K