Issue 112, 2015

Anomalous room temperature magnetoresistance in brownmillerite Ca2Fe2O5

Abstract

We demonstrate the hitherto unreported field induced magnetoresistance in wet chemical synthesized bulk polycrystalline brownmillerite Ca2Fe2O5. 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 Ca2Fe2O5.

Graphical abstract: Anomalous room temperature magnetoresistance in brownmillerite Ca2Fe2O5

Article information

Article type
Paper
Submitted
21 Aug 2015
Accepted
19 Oct 2015
First published
28 Oct 2015

RSC Adv., 2015,5, 92549-92553

Anomalous room temperature magnetoresistance in brownmillerite Ca2Fe2O5

S. Dhankhar, K. Gupta, G. Bhalerao, N. Shukla, M. Chandran, B. Francis, B. Tiwari, K. Baskar and S. Singh, RSC Adv., 2015, 5, 92549 DOI: 10.1039/C5RA16955K

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