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首页> 外文期刊>Physical review >Recovery and nonrecovery of the untrained state in an exchange-coupled system
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Recovery and nonrecovery of the untrained state in an exchange-coupled system

机译：交换耦合系统中未训练状态的恢复和不恢复

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摘要

We report depth sensitive investigations of the magnetic interaction between exchange-coupled stacked CoO and ferromagnetic Co bilayers (separated by thick Au layers) as we explore the degree of recovery of the untrained state after the first two field cycles. Such a recovery is expected by field cycling a reorientation field (H_(RE)) along a direction (Ω_(RE)) away from the initial field cooling direction. Measurements as a function of Ω_(RE) and the strength of H_(RE) (along each direction) map the influence of Ω_(RE) on the reversal mechanism in the layers and thereby the degree of recovery. Our results are consistent with the earlier observations in similar systems that was realized with Ω_(RE) = 90°. We ascribe these partial and/or significant recoveries to the unchanged sense of rotation after initial field cooling of the ferromagnetic magnetization upon each field cycling. Furthermore, in our system, we find that this recovery can be regulated by choosing various other H_(RE) and Ω_(RE) values without changing the rotational sense. The best recipe for recovery is identified for Ω_(RE) = 45°, that can be achieved partially with H_(RE) = 3.0 kOe and remain significant even with H_(RE) = 10.0 kOe. In this study we not only understand the fundamental mechanism in the recovery of training, but also instigate its technological prospects by lifting the directional restrictions of the reorientation field.
机译：我们探讨了交换耦合堆叠式CoO和铁磁Co双层薄膜（由厚的Au层隔开）之间的磁相互作用的深度敏感性研究，同时我们探索了前两个磁场周期后未训练状态的恢复程度。通过沿远离初始场冷却方向（Ω_（RE））的方向重新定向场（H_（RE））进行场循环，可以预期这种恢复。作为Ω_（RE）和H_（RE）强度（沿每个方向）的函数的测量结果将Ω_（RE）对层中反转机制的影响以及恢复程度映射了起来。我们的结果与Ω_（RE）= 90°时在类似系统中的早期观测结果一致。我们将这些部分和/或重要的恢复归因于在每次磁场循环后对铁磁磁化强度进行初始磁场冷却之后的不变旋转方向。此外，在我们的系统中，我们发现可以通过选择其他各种H_（RE）和Ω_（RE）值来调节这种恢复，而无需改变旋转方向。确定了最佳的恢复配方Ω_（RE）= 45°，这可以在H_（RE）= 3.0 kOe的情况下部分实现，即使在H_（RE）= 10.0 kOe的情况下也仍然有效。在这项研究中，我们不仅了解培训恢复的基本机制，而且通过解除重新定向领域的方向性限制来激发其技术前景。

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  • 来源
    《Physical review》 |2015年第22期|224428.1-224428.13|共13页
  • 作者

    Jam Jutimoosik; Rattikorn Yimnirun; Annette Setzer; Pablo Esquinazi; Jochen Stahn; Amitesh Paul;

  • 作者单位

    Technische Universitaet Muenchen, Physik Department, Lehrstuhl fuer Neutronenstreuung, James-Franck-Strasse 1, D-85748 Garching b. Muenchen, Germany,School of Physics, Institute of Science and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;

    School of Physics, Institute of Science and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;

    Division of Superconductivity and Magnetism, University of Leipzig, D-04103 Leipzig, Germany;

    Division of Superconductivity and Magnetism, University of Leipzig, D-04103 Leipzig, Germany;

    Laboratory for Neutron Scattering Paul Scherrer Institut, CH-5232 Vdligen, Switzerland;

    Technische Universitaet Muenchen, Physik Department, Lehrstuhl fuer Neutronenstreuung, James-Franck-Strasse 1, D-85748 Garching b. Muenchen, Germany;

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  • 关键词

    magnetic properties of interfaces (multilayers, superlattices, heterostructures); magnetization reversal mechanisms;

    机译：界面的磁性（多层;超晶格;异质结构）;磁化反转机制;

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