Cobalt–Carbon Complexes Induced Ferromagnetism in Chemically Modified Perovskite Dilute Magnetic Complex Oxides
Cobalt–Carbon Complexes Induced Ferromagnetism in Chemically Modified Perovskite Dilute Magnetic Complex Oxides
复制标题
DOI：
10.1021/jp4068922
复制
发表时间：
2013-08
影响因子：
3.7
通讯作者：
Xuefeng Wang;Bo Wan;Kangkang Zhang;B. Zhao;Zhaoguo Li;X. Wan;F. Song;B. Liu;X. Xiu;Yongbing Xu;Yi Shi;Rong Zhang
中科院分区：
文献类型：
--
作者：
Xuefeng Wang;Bo Wan;Kangkang Zhang;B. Zhao;Zhaoguo Li;X. Wan;F. Song;B. Liu;X. Xiu;Yongbing Xu;Yi Shi;Rong Zhang
阐明稀磁氧化物（DMO）的铁磁性对于实现未来的自旋电子器件具有重要意义。然而，在大多数情况下，载流子、缺陷和自旋的混合控制不便于揭示DMO中铁磁性的起源。钙钛矿型复合物（La，Sr）TiO_3通过共掺杂的方法易于实现载流子、缺陷或自旋的独立控制。在这里，我们展示了实验和理论研究相结合的钴-碳复合物，可以导致室温铁磁性的钙钛矿化学改性的La0.4Sr0.6Ti1-xCoxO 3（LSTCO）样品。通过研究Co掺杂剂和原位产生的碳的浓度上的磁化强度的依赖性，取代一些晶格氧原子，这样的复合物进行了研究。铁磁性的起源归因于Co ~（2+）-C复合物之间的长程介导的磁化作用，这一结论得到了控制极化子理论的有力支持。
The clarification of ferromagnetism in dilute magnetic oxides (DMOs) is of vital importance to realize future spintronic devices. However, the mixed control of carriers, defects, and spin in most cases is inconvenient to disclose the origin of ferromagnetism in DMOs. The perovskite complex compound of (La,Sr)TiO3 is apt to the independent control of carriers, defects, or spin through the codoping method. Here we demonstrate the combined experimental and theoretical studies on the cobalt–carbon complexes that can lead to the room-temperature ferromagnetism in perovskite chemically modified La0.4Sr0.6Ti1–xCoxO3 (LSTCO) samples. Such complexes are investigated by studying the dependence of magnetization on the concentrations of Co dopants and the in situ produced carbon that substitutes for some of the lattice oxygen atoms. The origin of ferromagnetism is attributed to the long-range-mediated magnetization among Co2+–C complexes through percolation-bound magnetic polarons, as strongly supported by the contro...