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Magnetic reversal in Dy-doped DyFe_2/YFe_2 superlattice films

机译：掺Dy的DyFe_2 / YFe_2超晶格薄膜的磁反转

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摘要

Reversible magnetic exchange springs can be formed in the magnetically soft YFe_2 layers of epitaxial DyFe_2/YFe_2 multilayer films. Here we show that the insertion of just two monolayers of DyFe_2, placed directly in the middle of the YFe_2 layers, brings about substantial changes. Results are presented for a Dy-doped (110)-oriented [DyFe_2(60A)/YFe_2(120 A)/DyFe_2(8 A)/YFe_2(120 A)]_(15) multilayer film, measured at 100 K in fields of up to ±10 T. Using bulk magnetometry, micromagnetic modeling, and Dy-specific x-ray magnetic circular dichroism, it is shown that Dy doping substantially increases the number of spin states available to the system. Altogether 12 distinct spring states are identified which bring additional complexity to the magnetic reversal process. In particular, the exchange springs are no longer reversible, exhibiting magnetic exchange-spring collapse. Full and partial magnetic loops are presented for fields applied along the in-plane easy [001] axis and the in-plane hard [110] axis. In particular, it is demonstrated that exchange-spring collapse is sharpest when the field is applied along a hard in-plane [110] axis.
机译：可在外延DyFe_2 / YFe_2多层膜的软磁YFe_2层中形成可逆磁性交换弹簧。在这里，我们表明，仅将两个单层的DyFe_2插入，直接放置在YFe_2层的中间会带来实质性的变化。给出了Dy掺杂（110）取向的[DyFe_2（60A）/ YFe_2（120 A）/ DyFe_2（8 A）/ YFe_2（120 A）] _（15）多层膜的结果，在100 K的场中测量最高可达±10T。使用体磁测量，微磁建模和Dy特定的x射线磁性圆二色性，结果表明Dy掺杂大大增加了系统可用的自旋态数量。总共确定了12种不同的弹簧状态，这给磁性反转过程带来了额外的复杂性。特别地，交换弹簧不再是可逆的，表现出磁性交换弹簧塌陷。给出了沿平面内[001]轴和平面内[110]硬轴施加的磁场的全部和部分磁环。特别地，证明了当沿硬平面[110]轴施加磁场时，交换​​弹簧的塌陷最明显。

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  • 来源
    《Physical review》 |2015年第9期|094403.1-094403.9|共9页
  • 作者

    G. B. G. Stenning; G. J. Bowden; P. A. J. de Groot; G. van der Laan; A. I. Figueroa; P. Bencok; P. Steadman; T. Hesjedal;

  • 作者单位

    School of Physics and Astronomy, University of Southampton, SO17 1BJ, United Kingdom,ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot, OX11 0QX, United Kingdom;

    School of Physics and Astronomy, University of Southampton, SO17 1BJ, United Kingdom;

    School of Physics and Astronomy, University of Southampton, SO17 1BJ, United Kingdom;

    Magnetic Spectroscopy Group, Diamond Light Source, Chilton, Didcot OX11 0DE, United Kingdom;

    Magnetic Spectroscopy Group, Diamond Light Source, Chilton, Didcot OX11 0DE, United Kingdom;

    Diamond Light Source, Chilton, Didcot OX11 0DE, United Kingdom;

    Diamond Light Source, Chilton, Didcot OX11 0DE, United Kingdom;

    Diamond Light Source, Chilton, Didcot OX11 0DE, United Kingdom,Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    multilayers; domain walls and domain structure; magnetic anisotropy; X-ray absorption spectra;

    机译：多层畴壁和畴结构;磁各向异性X射线吸收光谱;

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