Antiphase boundary-driven large exchange bias and negative magnetoresistance in NiCo2O4
Abstract
Nickel-based spinel oxide has recently attracted significant attention due to its remarkable magneto-transport properties, promising various spintronic applications. In this study, we observe an exchange bias effect, where the magnetic hysteresis loop shifts both horizontally and vertically when single-phase nanocrystalline NiCo2O4 is cooled in the presence of an external magnetic field. The magnitude of the exchange bias field is approximately 375 Oe at 5 K, and this effect disappears around 300 K. Furthermore, NiCo2O4 shows semiconducting behaviour in longitudinal resistivity and demonstrates a substantial negative magnetoresistance of ~31.5% at 10 K. The magnetoresistance exhibits a butterfly-shaped behaviour at low magnetic fields and becomes almost linear at high magnetic fields. A detailed analysis of the negative magnetoresistance and exchange bias reveals that both phenomena originate from the formation of antiphase boundaries in the as-synthesized NiCo2O4 sample, as confirmed by the high-resolution transmission electron micrograph.
Versions
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BibTeX
@misc{pramanik2026antiphase,
title = {{Antiphase boundary-driven large exchange bias and negative magnetoresistance in NiCo2O4}},
author = {Biswanath Pramanik and Pushpesh Pathak and Binoy K. Hazra},
howpublished = {arXiv},
year = {2026},
month = jul,
doi = {10.48550/arxiv.2607.12740},
eprint = {2607.12740},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.12740},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Antiphase boundary-driven large exchange bias and negative magnetoresistance in NiCo2O4
AU - Biswanath Pramanik
AU - Pushpesh Pathak
AU - Binoy K. Hazra
PY - 2026
DA - 2026/07/14
PB - arXiv
DO - 10.48550/arxiv.2607.12740
UR - https://arxiv.org/abs/2607.12740
AB - Nickel-based spinel oxide has recently attracted significant attention due to its remarkable magneto-transport properties, promising various spintronic applications. In this study, we observe an exchange bias effect, where the magnetic hysteresis loop shifts both horizontally and vertically when single-phase nanocrystalline NiCo2O4 is cooled in the presence of an external magnetic field. The magnitude of the exchange bias field is approximately 375 Oe at 5 K, and this effect disappears around 300 K. Furthermore, NiCo2O4 shows semiconducting behaviour in longitudinal resistivity and demonstrates a substantial negative magnetoresistance of ~31.5% at 10 K. The magnetoresistance exhibits a butterfly-shaped behaviour at low magnetic fields and becomes almost linear at high magnetic fields. A detailed analysis of the negative magnetoresistance and exchange bias reveals that both phenomena originate from the formation of antiphase boundaries in the as-synthesized NiCo2O4 sample, as confirmed by the high-resolution transmission electron micrograph.
ER -