Giant magnetoresistance effect in Fe-doped SrCoO2.9-δF0.1 perovskites. Issue 1 (1st January 2022)

• Record Type: Journal Article
• Authors: Huang, Jun; Tang, Haowen; Chen, Zezhi; Liu, Huan; Wang, Jianlin; Huang, Shuai; Yang, Jiwen; Fu, Zhengping; Peng, Ranran; Lu, Yalin
• Is Part Of: Ceramics international. Volume 48:Issue 1(2022)
• Page Start: 346
• Page End: 352
• Publication Date: 2022-01-01
• Subjects: Magnetoresistive materials -- Co-based perovskite oxides -- Negative magnetoresistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.09.109
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Excellent magnetoresistive materials have attracted people's attention due to their wide applications. Unfortunately, few cobalt-based perovskite oxides can demonstrate good magnetoresistance (MR) properties. Herein, a new series of SrCo1-x Fex O2.9-δ F0.1 (x = 0, 0.1, 0.2, and 0.3) perovskites are prepared and studied as potential magnetoresistive materials. Room temperature X-ray diffraction (XRD) and Rietveld refinement confirm the simple cubic structure of all samples. The magnetization vs temperature measurement reveals that the magnetic transition temperature goes down with the increase of Fe content, suggesting the weakened ferromagnetism caused by Fe 4+ -O-Co 3+, Fe 3+ -O-Fe 3+ and Fe 4+ -O-Fe 4+ interactions. And the resistivity data of all Fe doped samples can be better fitted using Mott's variable range hopping (VRH) model, suggesting its disordering semi-conduction behavior. Astonishingly, the SrCo0.8 Fe0.2 O2.9-δ F0.1 ceramic sample owns the giant negative magnetoresistance value of approximately 90% at 5 K in 90 kOe, which is almost the largest negative magnetoresistance in cobalt-based perovskite oxides, indicating that cobalt-based perovskites can be an underlying material system for the research of the potential material applying to magnetic sensors or other spintronic devices.