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Change in interface magnetism of an exchange-coupled system due to the presence of nonmagnetic spacers

机译：由于存在非磁性垫片，导致交换耦合系统的界面磁性发生变化

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摘要

We report on the effect of nonmagnetic spacer layers on the interface magnetism and the exchange bias in the archetypical [Co/CoO]_(16) system. The separation of the magnetic bilayers by Au layers with various thicknesses d_(Au) ≥ 25 nm leads to a threefold increase of the exchange bias field (H_(eb)). Reflectometry with polarized neutrons does not reveal any appreciable change in the domain population. This result is in agreement with the observation that the granular microstructure within the [Co/CoO] bilayers is independent of d_(Au). The significant reduction of the magnetic moments in the Co layers can be attributed to interfacial disorder at the Co-Au interfaces. Element-specific x-ray absorption spectroscopy attributes part of the enhancement of H_(eb) to the formation of Co_3O_4 in the [Co/CoO] bilayers within the multilayers. A considerable proportion of the increase of H_(eb) can be attributed to the loss of magnetization at each of the Co-Au interfaces with increasing d_(Au). We propose that the interfacial magnetism of ferro- and antiferromagnetic layers can be significantly altered by means of metallic spacer layers thus affecting the exchange bias significantly. This study shows that the magnetism in magnetic multilayers can be engineered by nonmagnetic spacer layers without involving the microstructure of the individual layers.
机译：我们报道了非磁性间隔层对原型[Co / CoO] _（16）系统中界面磁性和交换偏压的影响。磁性双层被厚度为d_（Au）≥25 nm的各种厚度的Au层分开导致交换偏压场（H_（eb））增长了三倍。带有极化中子的反射仪不能显示出域总数的任何明显变化。该结果与[Co / CoO]双层内的颗粒微观结构独立于d_（Au）的观察结果一致。 Co层中磁矩的显着减少可归因于Co-Au界面处的界面无序。特定元素的X射线吸收光谱将H_（eb）增强的部分原因归因于多层内[Co / CoO]双层中Co_3O_4的形成。 H_（eb）增加的很大一部分可以归因于随着d_（Au）的增加，每个Co-Au界面处的磁化强度损失。我们提出，可以通过金属间隔层显着改变铁磁性层和反铁磁性层的界面磁性，从而显着影响交换偏压。这项研究表明，磁性多层中的磁性可以通过非磁性间隔层来实现，而无需涉及各个层的微观结构。

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  • 来源
    《Physical review》 |2013年第1期|014431.1-014431.18|共18页
  • 作者

    Amitesh Paul; N. Paul; Jam Jutimoosik; Rattikorn Yimnirun; Saroj Rujirawat; Britta Hoepfner; Iver Lauermann; M. Lux-Steiner; Stefan Mattauch; Peter Boeni;

  • 作者单位

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

    Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany;

    School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, and Thailand Center of Excellence in Physics (ThEP Center), Commission on Higher Education, Bangkok, Thailand;

    School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, and Thailand Center of Excellence in Physics (ThEP Center), Commission on Higher Education, Bangkok, Thailand;

    School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, and Thailand Center of Excellence in Physics (ThEP Center), Commission on Higher Education, Bangkok, Thailand;

    Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany;

    Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany;

    Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany;

    Juelich Centre for Neutron Science Forschungszentrum Juelich GmbH, Aussenstelle am FRM-II c/o TV Muenchen, Lichtenbergstrasse 1,D-85747 Garching b. Muenchen, Germany;

    Technische Universitaet Muenchen, Physik Department E21, 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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