Spin glassy behavior and large exchange bias effect in cubic perovskite Ba0.8Sr0.2FeO3-δ

doi:10.1088/1674-1056/28/6/068104

Abstract

A single-phase iron oxide Ba_0.8Sr_0.2FeO_3-δ with a simple cubic perovskite structure in Pm-3m symmetry is successfully synthesized by a solid-state reaction method in O₂ flow. The oxygen content is determined to be about 2.81, indicating the formation of mixed Fe³⁺ and Fe⁴⁺ charge states with a disorder fashion. As a result, the compound shows small-polaron conductivity behavior, as well as spin glassy features arising from the competition between the ferromagnetic interaction and the antiferromagnetic interaction. Moreover, the competing interactions also give rise to a remarkable exchange bias effect in Ba_0.8Sr_0.2FeO_2.81, providing an opportunity to use it in spin devices.

Keywords: high-pressure synthesis exchange bias effect spin glass

Received: 05 March 2019
Revised: 26 March 2019
Accepted manuscript online:

PACS:	81.40.Vw	(Pressure treatment)
	75.50.Lk	(Spin glasses and other random magnets)
	75.30.Et	(Exchange and superexchange interactions)
	75.30.Gw	(Magnetic anisotropy)

Fund:

Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0305700 and 2018YFGH000095), the National Natural Science Foundation of China (Grant Nos. 51772324 and 11574378), and the Fund from the Chinese Academy of Sciences (Grant No. QYZDB-SSW-SLH013, GJHZ1773).

Corresponding Authors: Guang-Hui Zhou, You-Wen Long
E-mail: ghzhou@hunnu.edu.cn;ywlong@iphy.ac.cn

Cite this article:

Yu-Xuan Liu(刘宇轩), Zhe-Hong Liu(刘哲宏), Xu-Bin Ye(叶旭斌), Xu-Dong Shen(申旭东), Xiao Wang(王潇), Bo-Wen Zhou(周博文), Guang-Hui Zhou(周光辉), You-Wen Long(龙有文) Spin glassy behavior and large exchange bias effect in cubic perovskite Ba_0.8Sr_0.2FeO_3-δ 2019 Chin. Phys. B 28 068104

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Spin glassy behavior and large exchange bias effect in cubic perovskite Ba0.8Sr0.2FeO3-δ

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Spin glassy behavior and large exchange bias effect in cubic perovskite Ba_0.8Sr_0.2FeO_3-δ