Toward Versatile Sr2FeMoO6-Based Spintronics by Exploiting Nanoscale Defects

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• 作者：Minnamari Saloaro ; Martin Hoffmann ; Waheed A. Adeagbo ; Sari Granroth ; Hakan Deniz ; Heikki Palonen ; Hannu Huhtinen ; Sayani Majumdar ; Pekka Laukkanen ; Wolfram Hergert ; Arthur Ernst ; Petriina Paturi
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：8
• 期：31
• 页码：20440-20447
• 全文大小：486K
• 年卷期：0
• ISSN：1944-8252

文摘

To actualize the high spintronic application potential of complex magnetic oxides, it is essential to fabricate these materials as thin films with the best possible magnetic and electrical properties. Sr₂FeMoO₆ is an outstanding candidate for such applications, but presently no thin film synthesis route, which would preserve the magnetic properties of bulk Sr₂FeMoO₆, is currently known. In order to address this problem, we present a comprehensive experimental and theoretical study where we link the magnetic and half metallic properties of Sr₂FeMoO₆ thin films to lattice strain, Fe—Mo antisite disorder and oxygen vacancies. We find the intrinsic effect of strain on the magnetic properties to be very small, but also that an increased strain will significantly stabilize the Sr₂FeMoO₆ lattice against the formation of antisite disorder and oxygen vacancies. These defects, on the other hand, are recognized to drastically influence the magnetism of Sr₂FeMoO₆ in a nonlinear manner. On the basis of the findings, we propose strain manipulation and reductive annealing as optimization pathways for improving the spintronic functionality of Sr₂FeMoO₆.