Realization of a Half Metal with a Record‐High Curie Temperature in Perovskite Oxides. Issue 17 (24th March 2022)

• Record Type: Journal Article
• Authors: Liu, Zhehong; Zhang, Shuaikang; Wang, Xiao; Ye, Xubin; Qin, Shijun; Shen, Xudong; Lu, Dabiao; Dai, Jianhong; Cao, Yingying; Chen, Kai; Radu, Florin; Wu, Wen‐Bin; Chen, Chien‐Te; Francoual, Sonia; Mardegan, José R. L.; Leupold, Olaf; Tjeng, Liu Hao; Hu, Zhiwei; Yang, Yi‐feng; Long, Youwen
• Is Part Of: Advanced materials. Volume 34:Issue 17(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-24
• Subjects: half metal -- high Curie temperature -- high‐pressure synthesis -- quadruple perovskite oxide; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202200626
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Half metals, in which one spin channel is conducting while the other is insulating with an energy gap, are theoretically considered to comprise 100% spin‐polarized conducting electrons, and thus have promising applications in high‐efficiency magnetic sensors, computer memory, magnetic recording, and so on. However, for practical applications, a high Curie temperature combined with a wide spin energy gap and large magnetization is required. Realizing such a high‐performance combination is a key challenge. Herein, a novel A‐ and B‐site ordered quadruple perovskite oxide LaCu3 Fe2 Re2 O12 with the charge format of Cu 2+ /Fe 3+ /Re 4.5+ is reported. The strong Cu 2+ (↑)Fe 3+ (↑)Re 4.5+ (↓) spin interactions lead to a ferrimagnetic Curie temperature as high as 710 K, which is the reported record in perovskite‐type half metals thus far. The saturated magnetic moment determined at 300 K is 7.0 μB f.u. −1 and further increases to 8.0 μB f.u. −1 at 2 K. First‐principles calculations reveal a half‐metallic nature with a spin‐down conducting band while a spin‐up insulating band with a large energy gap up to 2.27 eV. The currently unprecedented realization of record Curie temperature coupling with the wide energy gap and large moment in LaCu3 Fe2 Re2 O12 opens a way for potential applications in advanced spintronic devices at/above room temperature. Abstract : Half metals have promising applications in advanced spintronic devices. A new half metal LaCu3 Fe2 Re2 O12 with a record‐high Curie temperature ( T C ) in perovskite oxides, combining with a wide spin‐up energy gap ( E g ) and a large magnetization ( M N ), is synthesized. The current LaCu3 Fe2 Re2 O12 thus shows the best synthetic performance ( T C × E g × M N ) among all half‐metallic oxides discovered so far.