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Hysteresis-free magnetization reversal of exchange-coupled bilayers with finite magnetic anisotropy

机译：自由磁耦合双层的无磁磁磁化逆转，有限磁各向异性

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摘要

Exchange-coupled structures consisting of ferromagnetic and ferrimagnetic layers become technologically more and more important. We show experimentally the occurrence of completely reversible, hysteresis-free minor loops of [Co(0.2nm)/Ni(0.4nm)/Pt(0.6nm)]_N multilayers exchange-coupled to a 20-nm-thick ferrimagnetic Tb_(28)Co_(14)Fe_(58) layer, acting as a hard magnetic pinning layer. Furthermore, we present detailed theoretical investigations by means of micromagnetic simulations and, most importantly, a purely analytical derivation for the condition of the occurrence of full reversibility in magnetization reversal. Hysteresis-free loops always occur if a domain wall is formed during the reversal of the ferromagnetic layer and generates an intrinsic hard-axis bias field that overcomes the magnetic anisotropy field of the ferromagnetic layer. The derived condition further reveals that the magnetic anisotropy and the bulk exchange of both layers, as well as the exchange coupling strength and the thickness of the ferromagnetic layer, play an important role for its reversibility.
机译：由铁磁和铁磁层组成的交换耦合结构变得越来越重要。我们在实验上显示出完全可逆的，自由滞后的次循环（0.4nm）/ pt（0.6nm）] _ n多层交换到20-nm厚的铁磁性tb_（28 ）CO_（14）FE_（58）层，用作硬磁钉扎层。此外，我们通过微磁性模拟提出了详细的理论研究，最重要的是，最重要的是纯粹的分析推导，用于磁化反转中完全可逆性的情况。如果在铁磁层的反转期间形成畴壁并产生克服铁磁层的磁各向异性场的固有硬轴偏置场，则总是发生无磁磁壁的环。衍生的条件进一步揭示了磁各向异性和两层的散装交换，以及铁磁层的交换耦合强度和厚度，以其可逆性起重要作用。

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  • 来源
    《Physical review》 |2020年第1期|014429.1-014429.9|共9页
  • 作者

    Christoph Vogler; Michael Heigl; Andrada-Oana Mandru; Birgit Hebler; Miguel Marioni; Hans Josef Hug; Manfred Albrecht; Dieter Suess;

  • 作者单位

    Faculty of Physics University of Vienna Boltzmanngasse 5 1090 Vienna Austria;

    Institute of Physics University of Augsburg Augsburg 86159 Germany;

    Empa-Swiss Federal Laboratories for Materials Science and Technology CH-8600 Duebendorf Switzerland;

    Institute of Physics University of Augsburg Augsburg 86159 Germany;

    Empa-Swiss Federal Laboratories for Materials Science and Technology CH-8600 Duebendorf Switzerland;

    Empa-Swiss Federal Laboratories for Materials Science and Technology CH-8600 Duebendorf Switzerland Department of Physics University of Basel CH-4056 Basel Switzerland;

    Institute of Physics University of Augsburg Augsburg 86159 Germany;

    Christian Doppler Laboratory for Advanced Magnetic Sensing and Materials Faculty of Physics University of Vienna Boltzmanngasse 5 1090 Vienna Austria;

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