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Exchange-bias-like coupling in a ferrimagnetic Fe/Tb multilayer

机译:铁磁性Fe / Tb多层膜中的交换偏压样耦合

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摘要

Field cooling of a transition metal-rare earth (TM-RE) Fe/Tb-multilayer system is shown to form a double hysteresis loop with exchange-bias-like shifts along and opposite to the field cooling axis below the ordering temperature of the RE. The measurement of the polarized neutron reflectivity at various applied fields confirms an antiferromagnetic alignment between the individual layers of Fe and Tb associated with a significant value of the magnetic moment for the Tb layers, even at room temperature. We attribute the shifts of the hysteresis loops to the formation of 2π -domain walls by the interface moments that are pinned by the magnetically hard Tb layers forming bidomainlike states in this layered artificial ferrimagnetic system. We conclude that the exchange bias in Fe/Tb-multilayers, the RE layers being on either sides of the TM layers, is caused by the formation of 2π -domain walls in the Fe layers thus excluding an explanation in terms of π -domain walls, which are believed to be responsible for the exchange bias in other RE-TM bilayer systems.
机译:过渡金属-稀土(TM-RE)Fe / Tb-多层系统的场冷却显示形成双磁滞回线,在RE的有序温度以下,该场沿和与场冷却轴相反的方向具有类似交换偏置的位移。即使在室温下,在各种施加场上对极化中子反射率的测量也证实了Fe和Tb各个层之间的反铁磁对准,这与Tb层的磁矩的显着值有关。我们将磁滞回线的位移归因于界面力矩的形成,该界面力矩由层状人工亚铁磁系统中形成双畴状态的硬磁Tb层所钉扎的界面矩所钉扎。我们得出的结论是,Fe / Tb多层中的交换偏压(RE层在TM层的两侧)是由于在Fe层中形成2π畴壁引起的,因此不包括关于π畴壁的解释,据信是其他RE-TM双层系统中的交换偏差的原因。

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  • 来源
    《Physical review》 |2014年第14期|144415.1-144415.13|共13页
  • 作者单位

    Technische Universitaet Muenchen, Physik-Department E21, Lehrstuhl fuer Neutronenstreuung, James-Franck-Strasse 1, D-85748 Garching b. Munchen, Germany;

    Technische Universitaet Muenchen, Physik-Department E21, Lehrstuhl fuer Neutronenstreuung, James-Franck-Strasse 1, D-85748 Garching b. Munchen, Germany;

    Technische Universitaet Muenchen, Physik-Department E21, Lehrstuhl fuer Neutronenstreuung, James-Franck-Strasse 1, D-85748 Garching b. Munchen, Germany;

    Technische Universitaet Muenchen, Physik-Department E21, Lehrstuhl fuer Neutronenstreuung, James-Franck-Strasse 1, D-85748 Garching b. Munchen, Germany;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic anisotropy; magnetic properties of thin films, surfaces, and interfaces;

    机译:磁各向异性薄膜;表面和界面的磁性;

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