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首页> 外文期刊>Physica, B. Condensed Matter >First order reversal curves analysis of the temperature effect on magnetic interactions in barium ferrite with La-Co addition
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First order reversal curves analysis of the temperature effect on magnetic interactions in barium ferrite with La-Co addition

机译：La-Co添加对钡铁氧体磁相互作用的温度影响的一阶反转曲线分析

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摘要

First order reversal curves (FORCs) distributions are a powerful tool for investigating hysteresis and interactions in magnetic systems and have been widely applied. La-Co substitution in barium hexaferrites has also been extensively studied. The most effective substitution to improve the magnetic properties (coercive field and energy product) is given by x = y = 0.2 in the formula Ba1-xLaxFe12-yCoYO19. In this work, this stoichiometry is initially used to obtain a state where more than one phase is present. The magnetic behavior as a function of temperature was studied in order to have an insight into the magnetic interactions that originate a decrease in the magnetic performance of Ba hexaferrite magnets. The sample was structurally characterized by X-ray diffraction (XRD) and magnetically studied in a SQUID magnetometer. FORC distributions were used to study the dependence of the magnetic interactions with the temperature. FORC diagrams performed on the sample at different temperatures exhibit similar characteristics, such as the spread in the h(c)-h(u) plane and a spread out of the h(c)-axes. These features are interpreted in terms of exchange-interacting particles and dipolar interactions, respectively. As the temperature decreases, stronger interactions are noticed among hard and soft phases.
机译：一阶反转曲线（FORC）分布是研究磁系统中的磁滞和相互作用的有力工具，已得到广泛应用。六价铁酸钡中的La-Co取代也得到了广泛的研究。在公式Ba1-xLaxFe12-yCoYO19中，x = y = 0.2给出了改善磁性能（矫顽场和能量积）的最有效替代方法。在这项工作中，最初使用这种化学计量来获得存在多于一个相的状态。研究了磁行为与温度的关系，以了解导致六方晶Ba磁体磁性能下降的磁相互作用。通过X射线衍射（XRD）对样品进行结构表征，并在SQUID磁力计中对其进行磁性研究。 FORC分布用于研究磁相互作用与温度的关系。在不同温度下对样品执行的FORC图表现出相似的特性，例如在h（c）-h（u）平面上的展宽和在h（c）轴外的展宽。这些特征分别根据交换相互作用颗粒和偶极相互作用来解释。随着温度降低，在硬相和软相之间会发现较强的相互作用。

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