The present work describes a synthesis and characterization strategy employed to study the magnetic anisotropic properties of a diluted nanoparticulate system. The system under analysis is composed of monodisperse and highly crystalline 16 nm Co0.5Fe2.5O4 nanoparticles (NPs), homogenously dispersed in 1-octadecene. Owing to the liquid nature of the matrix at room temperature, the relative orientation of the nanoparticle easy axis can be controlled by an external magnetic field, enabling us to measure how the magnetic properties are modified by the alignment of the particles within the sample. In turn, by employing this strategy, we have found a significant hardness and squareness enhancement of the hysteresis loop in the magnetically oriented system, with the coercive field reaching a value as high as 30.2 kOe at low temperatures. In addition, the magnetic behavior associated with the system under study was supported by additional magnetic measurements, which were ascribed to different events expected to take place throughout the sample characterization, such as the melting process of the 1-octadecene matrix or the NP relaxation under the Brownian mechanism at high temperatures.The present work describes a synthesis and characterization strategy employed to study the magnetic anisotropic properties of a diluted nanoparticulate system. The system under analysis is composed of monodisperse and highly crystalline 16 nm Co0.5Fe2.5O4 nanoparticles (NPs), homogenously dispersed in 1-octadecene. Owing to the liquid nature of the matrix at room temperature, the relative orientation of the nanoparticle easy axis can be controlled by an external magnetic field, enabling us to measure how the magnetic properties are modified by the alignment of the particles within the sample. In turn, by employing this strategy, we have found a significant hardness and squareness enhancement of the hysteresis loop in the magnetically oriented system, with the coercive field reaching a value as high as 30.2 kOe at low temperatures. In addition, the magnetic behavior associated with the system under study was supported by additional magnetic measurements, which were ascribed to different events expected to ...

中文翻译：

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磁性取向钴铁氧体纳米粒子在低温下的矫顽力显着增强

目前的工作描述了用于研究稀释纳米颗粒系统的磁各向异性特性的合成和表征策略。所分析的系统由单分散和高度结晶的 16 nm Co0.5Fe2.5O4 纳米粒子 (NPs) 组成，均匀分散在 1-十八碳烯中。由于室温下基质的液体性质，纳米粒子易轴的相对取向可以由外部磁场控制，使我们能够测量样品内粒子的排列如何改变磁性。反过来，通过采用这种策略，我们发现磁定向系统中磁滞回线的硬度和矩形度显着增强，矫顽力在低温下达到了高达 30.2 kOe 的值。此外，与正在研究的系统相关的磁性行为得到了额外的磁性测量的支持，这些测量归因于预期在整个样品表征过程中发生的不同事件，例如 1-十八碳烯基质的熔化过程或布朗机制下的 NP 弛豫在高温下。本工作描述了一种合成和表征策略，用于研究稀释纳米颗粒系统的磁各向异性特性。所分析的系统由单分散和高度结晶的 16 nm Co0.5Fe2.5O4 纳米粒子 (NPs) 组成，均匀分散在 1-十八碳烯中。由于基质在室温下的液体性质，纳米粒子易轴的相对取向可以通过外部磁场控制，使我们能够测量样品中粒子的排列如何改变磁性。反过来，通过采用这种策略，我们发现磁定向系统中磁滞回线的硬度和矩形度显着增强，矫顽力在低温下达到了高达 30.2 kOe 的值。此外，与所研究系统相关的磁行为得到了额外的磁测量的支持，这些测量归因于预期会发生的不同事件...... 2 kOe 在低温下。此外，与所研究系统相关的磁行为得到了额外的磁测量的支持，这些测量归因于预期会发生的不同事件...... 2 kOe 在低温下。此外，与所研究系统相关的磁行为得到了额外的磁测量的支持，这些测量归因于预期会发生的不同事件......