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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Investigation of 'magnetic hardness' of the grain boundary in Sr2FeMoO6 ceramics
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Investigation of 'magnetic hardness' of the grain boundary in Sr2FeMoO6 ceramics

机译：SR2FEMO6陶瓷中晶界“磁硬度”的研究

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摘要

Intrinsic spin-valve-type magnetoresistance SVMR) behavior recently observed in Sr2FeMoO6 SFMO) is proposed to originate from the 'magnetic hardness' of the insulating grain boundary. It suggests the potential for tuning the SVMR by manipulating the magnetoresistance peak position of the grain boundary with a suitable magnetic material. In this paper,CoFe2O4/Sr2FeMoO6 (CFO(x)/SFMO(100%): x = 0%-30%) composites were specifically designed by introducing the hard magnetic insulator CFO into the grain boundary of SFMO. Insulating CFO can increase the grain boundary strength (macroscopic resistivity), resulting in an enhanced low-field magnetoresistance (LFMR) of similar to 1.6 times with respect to the maternal SFMO. The magnetic coercivity (H-c) of the CFO/SFMO grain material shows a complete enhancement which is dependent on the CFO content (x) and is due to the high magnetic anisotropy of the CFO. Vastly different from the H-c response is the coercive field variance of the magnetoresistance (H-c (MR)), which exhibits a complex correlation with the CFO content (x). Regardless of how much the H-c (MR) changes, the SVMR behavior is still maintained because of a larger H-c (MR) than that of H-c when x = 18%. However, almost comparable values of H-c (MR) and H-c are observed when x increases up to 30%, where the SVMR property is greatly destroyed. In addition, the ferromagnetic transition temperature T-c values of all the samples show no obvious dependence on the CFO content (x). These interesting observations indicate that the CFO content (x) not only significantly optimizes the LFMR but it also effectively tunes the SVMR behavior. Our work may encourage further investigation of SVMR behavior in SFMO and other similar systems.
机译：提出了在SR2Femoo6 SFMO中最近观察到的内在旋转阀型磁阻SVMR）行为来源自绝缘晶界的“磁硬度”。它表明通过用合适的磁性材料操纵晶界的磁阻峰位置来调谐SVMR的可能性。在本文中，通过将硬磁绝缘体CFO引入SFMO的晶界，具体设计CoFe2O4 / Sr2FemO6（CFO（X）/ SFMO（100％）：x = 0％-30％）复合材料。绝缘CFO可以增加晶粒边界强度（宏观电阻率），导致相对于母体SFMO的增强的低场磁阻（LFMR）类似于1.6倍。 CFO / SFMO晶粒材料的磁矫顽力（H-C）显示完全增强，其取决于CFO含量（X），并且是由于CFO的高磁各向异性。与H-C响应非常不同的是磁阻（H-C（MR））的矫顽场方差，其表现出与CFO含量（X）的复杂相关性。无论H-C（MR）的变化如何，由于x＆ = 18％，仍然比H-C（MR）较大的H-C（MR）仍然保持SVMR行为。然而，当x增加高达30％时，观察到H-C（MR）和H-C的几乎相当的值，其中SVMR性能大大破坏。此外，所有样品的铁磁性转变温度T-C值显示出对CFO含量（X）的明显依赖性。这些有趣的观察结果表明，CFO含量（X）不仅显着优化LFMR，而且还有效地调整了SVMR行为。我们的工作可能会鼓励进一步调查SFMO和其他类似系统中的SVMR行为。

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