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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Room temperature ferromagnetism in pure and Co- and Fe-doped CeO _2 dilute magnetic oxide: Effect of oxygen vacancies and cation valence
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Room temperature ferromagnetism in pure and Co- and Fe-doped CeO _2 dilute magnetic oxide: Effect of oxygen vacancies and cation valence

机译：纯和Co和Fe掺杂的CeO _2稀磁性氧化物中的室温铁磁性：氧空位和阳离子化合价的影响

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摘要

The evolution of reversible room temperature ferromagnetism (RTFM) has been investigated in Co- and Fe-doped (5% each) and non-doped CeO_2 polycrystalline samples. Specimens with different oxygen vacancy (V_O) concentration including the (i) as-synthesized, (ii) hydrogenated and (iii) re-annealed in air were investigated using SQUID magnetometry, x-ray diffraction and x-ray photoelectron spectroscopy. The influence of the electronic properties on the RTFM was examined/analysed systematically. Our findings confirm that the ferromagnetism observed in CeO_2 originates due to the oxygen vacancies, supporting the V_O mediated ferromagnetic exchange mechanism. Additionally, the cationic (cerium and transition metal) valence states play a crucial role.
机译：在掺钴和掺铁（各占5％）和未掺杂的CeO_2多晶样品中，研究了可逆室温铁磁（RTFM）的演化。使用SQUID磁力仪，X射线衍射和X射线光电子能谱研究了具有不同氧空位（V_O）浓度的样品，包括（i）合成后，（ii）氢化和（iii）在空气中重新退火。系统地检查/分析了电子性能对RTFM的影响。我们的发现证实，在CeO_2中观察到的铁磁性是由于氧空位引起的，从而支持了V_O介导的铁磁交换机制。此外，阳离子（铈和过渡金属）价态也起着至关重要的作用。

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