ac-bias recording and preisach diagrams
ac-bias recording and preisach diagrams
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ac-bias 记录和 preisach 图
DOI：
10.1063/1.344586
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发表时间：
1990
影响因子：
3.2
通讯作者：
A. Ribeiro
中科院分区：
文献类型：
--
作者：
A. Ribeiro
Preisach图可用于模拟颗粒介质的磁性。在这样的图上，施加的磁场应该具有确定的方向。然而，在磁记录过程中，所施加的磁场在幅度和方向上都发生变化。我们报告了一个扩展的著名的相干开关模式的细颗粒，使得可能的定义一个有效的纵向施加场，这取决于纵向和横向分量的外部施加场。Preisach图的可能性进行了探讨的情况下，合理地排列的颗粒介质，和一个模型的交流偏置磁记录这种媒体。它示出，已知的纵向和横向轮廓的磁头字段和写入电流的大小，它是可能的，以确定区域的Preisach图，对应于偶极子切换+或-，和区域对应于未受影响的偶极子，保持在初始状态。粒子开关场的角度依赖性的影响自然包括在内，并且只要Preisach图也可用于该方向，就可以获得垂直于对准方向的剩磁。
Preisach diagrams can be useful for modeling the magnetic properties of particulate media. On such diagrams, magnetic applied fields are supposed to have a well‐determined direction. However, in magnetic recording processes, the applied magnetic fields change both in magnitude and direction. We report an extension of the well‐known coherent switching mode for fine particles that makes possible the definition of an effective longitudinal applied field which depends on both longitudinal and transverse components of the externally applied field. The possibilities of Preisach diagrams are explored in the case of reasonably well‐aligned particulate media, and a model of ac‐biased magnetic recording for such media is presented. It is shown that, knowing the longitudinal and transversal profiles of magnetic head fields and the magnitude of the writing current, it is possible to determine the zones of Preisach diagrams, which correspond to dipoles switched + or −, and the zone corresponding to the unaffected dipoles, which remain in the initial state. The effect of angular dependence of particle switching fields is naturally included, and magnetic remanence in the direction perpendicular to alignment may be obtained whenever the Preisach diagram is also available for that direction.