Room temperature ferromagnetism in monoclinic Mn-doped ZrO2 thin films
Room temperature ferromagnetism in monoclinic Mn-doped ZrO2 thin films
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DOI：
10.1063/1.3670577
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发表时间：
2012-02
影响因子：
3.2
通讯作者：
N. H. Hong;C. Park;A. T. Raghavender;O. Ciftja;N. Bingham;M. Phan;H. Srikanth
中科院分区：
文献类型：
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作者：
N. H. Hong;C. Park;A. T. Raghavender;O. Ciftja;N. Bingham;M. Phan;H. Srikanth
理论预测，高温铁磁性（FM）应该发现在立方Mn掺杂的ZrO 2。我们的实验数据揭示室温FM在锰掺杂的氧化锆薄膜生长在LaAlO 3衬底。立方相Mn_（0.05）Zr_（0.95）O_2薄膜的最大饱和磁矩（Ms）约为13.8 μB/Mn，随着Mn含量的增加，饱和磁矩减小。在这种情况下，本征FM与Mn掺杂的ZrO 2的立方结构强烈相关，并且通过中间氧原子的Mn-Mn交换相互作用是重要的。在钇稳定氧化锆（YSZ）衬底上生长的单斜Mn掺杂ZrO 2薄膜中也观察到室温FM，然而，具有完全不同的性质。虽然原始的单斜ZrO 2薄膜已经是铁磁性的，但掺杂Mn可以使磁矩增加约40%（Ms为2.68 μB/Mn）。与立方相的情况不同，单斜Mn掺杂ZrO 2薄膜中的FM不仅来自于交换作用，还来自于缺陷。
Theory has predicted that high temperature ferromagnetism (FM) should be found in cubic Mn-doped ZrO2. Our experimental data reveal room temperature FM in Mn-doped ZrO2 thin films grown on LaAlO3 substrates. The largest saturated magnetic moment (Ms) is found to be about 13.8 μB/Mn for the cubic Mn0.05Zr0.95O2 films and it decreases as the Mn content increases. In this case, the intrinsic FM is strongly associated with the cubic structure of Mn-doped ZrO2, and the Mn-Mn exchange interactions via intermediate oxygen atoms is important. Room temperature FM is also observed in monoclinic Mn-doped ZrO2 thin films grown on Yttrium Stabilized Zirconia (YSZ) substrates, however, with a completely different nature. Though pristine monoclinic ZrO2 films are already ferromagnetic, doping Mn can enhance the magnetic moment by about 40% (Ms is 2.68 μB/Mn). Differently from the cubic case, FM in monoclinic Mn-doped ZrO2 films does not come only via exchange interactions, but also from defects.