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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Magnetic and structural investigations on as-grown and oxygen annealed PLD SnO_2 :Co thin films
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Magnetic and structural investigations on as-grown and oxygen annealed PLD SnO_2 :Co thin films

机译：氧退火退火后的PLD SnO_2：Co薄膜的磁性和结构研究

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Detailed structural and magnetic characterization has been performed on dilute magnetic oxide SnO_2 :Co thin films deposited on R-cut sapphire substrates via pulsed laser deposition from a doped target of 5 at.% nominal Co concentration. These studies demonstrate that the films are highly crystalline, composed of single phase SnO_2 :Co grains, with no formation of Co nanoclusters in the oxide matrix, and are ferromagnetic at room temperature. It was found that ferromagnetism and electrical conduction are strongly dependent on the growth rate, film thickness and post deposition annealing protocols and suggest that the magnetic properties are related to the number of defects, and thus the crystallinity of the films. For thicknesses above 70 nm, films are electrically conducting and ferromagnetic, with a relatively constant MS of about 20 emu cm~(-3) at room temperature. Moreover, the moment per unit area varies linearly with the film thickness, showing that the ferromagnetism of the studied materials is a volume property. Samples annealed in conditions similar to their growth display a dramatic increase of MS in the first 5 min of annealing. Temperature dependent magnetization measurements reveal that approximately one third of the cobalt couples ferromagnetically with the remaining two thirds existing in the form of paramagnetic isolated cobalt spins. Experimental evidence supports the conclusion that films are formed of single crystal grains of SnO_2 doped with Co, held together by defect-rich grain boundaries.
机译：详细的结构和磁特性已通过从5at。％标称Co浓度的掺杂靶材通过脉冲激光沉积在R切割蓝宝石衬底上沉积的稀磁性氧化物SnO_2：Co薄膜上进行。这些研究表明，该膜是高度结晶的，由单相SnO_2：Co晶粒组成，在氧化物基质中没有形成Co纳米团簇，并且在室温下是铁磁性的。已经发现，铁磁性和电导率在很大程度上取决于生长速率，膜厚度和沉积后退火方案，并且表明磁性能与缺陷的数量有关，并因此与膜的结晶性有关。对于70nm以上的厚度，膜是导电的并且是铁磁性的，在室温下具有约20emu cm·（-3）的相对恒定的MS。此外，每单位面积的力矩随膜厚度线性变化，表明所研究材料的铁磁性是体积性质。在与其生长相似的条件下退火的样品在退火的前5分钟内显示MS的急剧增加。与温度有关的磁化测量表明，大约三分之一的钴铁磁性耦合，其余三分之二以顺磁隔离钴自旋的形式存在。实验证据支持这样的结论：薄膜由掺有Co的SnO_2单晶晶粒形成，并通过富缺陷的晶界结合在一起。

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